@inproceedings{FoersterStolpmann2023, author = {Foerster, Tim and Stolpmann, Alexander}, title = {Machbarkeitsstudie zur Einf{\"u}hrung einer kameragest{\"u}tzten Brandfr{\"u}herkennung an einer Coilbox eines Warmwalzwerkes}, series = {Tagungsband AALE 2023 : Mit Automatisierungstechnik gegen den Klimawandel}, booktitle = {Tagungsband AALE 2023 : Mit Automatisierungstechnik gegen den Klimawandel}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur}, address = {Leipzig}, isbn = {978-3-910103-01-6}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17148}, pages = {1 -- 10}, year = {2023}, abstract = {Zur L{\"o}sung des Problems der Einf{\"u}hrung einer Brandfr{\"u}herkennung an einer Anlage mit erheblichen Fl{\"a}chen an W{\"a}rmestrahlung und Temperaturen um 1.100 Grad Celsius, wird der Einsatz von infraroter und visueller Kameratechnik und Bildverarbeitungssystemen in einer Machbarkeitsstudie er{\"o}rtert und als Vorlage zur Umsetzung gebracht. Hierf{\"u}r m{\"u}ssen alle technischen Randbedingungen der baulichen Anlage, die Kosten und auch die organisatorischen Aspekte ermittelt und bewertet werden. Auf Basis von St{\"o}rfallszenarien wurden Brandversuche durchgef{\"u}hrt und in thermographischer und visueller Bildgebung ausgewertet. Entscheidend war die signifikante Abgrenzung eines Feuers vom anlagenspezifischen ungest{\"o}rten Zustand.}, language = {de} } @inproceedings{AnlaufStolpmann2023, author = {Anlauf, Fenja and Stolpmann, Alexander}, title = {Individualisierbare, webbasierte Benutzerschnittstelle zur {\"U}berwachung von Industrieprozessen}, series = {Tagungsband AALE 2023 : Mit Automatisierungstechnik gegen den Klimawandel}, booktitle = {Tagungsband AALE 2023 : Mit Automatisierungstechnik gegen den Klimawandel}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur}, address = {Leipzig}, isbn = {978-3-910103-01-6}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17135}, pages = {1 -- 9}, year = {2023}, abstract = {Im Rahmen eines Projektes zur Applikation der Pr{\"a}skriptiven Analytik f{\"u}r die dynamische Prozessf{\"u}hrung von intelligenten K{\"a}lteanlagen wurde eine webbasierte Software mit einer anwenderfreundlichen und individualisierbaren Benutzerschnittstelle zur {\"U}berwachung und Regelung umgesetzt. Als Teilprojekt wurde ein Softwarepaket entwickelt, welches eine konfigurierbare Anlagenvisualisierung f{\"u}r diese Benutzerschnittstelle umsetzt. Beim Entwurf und der Implementierung der Software wurde auf einen modularen Aufbau geachtet, sodass die Software leicht erweiterbar und aus auswechselbaren, unabh{\"a}ngigen Komponenten zusammengesetzt ist.}, language = {de} } @inproceedings{KupperFiebelkornStolpmannetal.2026, author = {Kupper, Stefan and Fiebelkorn, Richard and Stolpmann, Alexander and Reiff-Stephan, J{\"o}rg}, title = {Robuste Lokalisierung und Pfadplanung auf verschiedenen Gr{\"o}ßenskalen durch fraktale Landmarken}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21370}, pages = {1 -- 10}, year = {2026}, abstract = {In diesem Beitrag wird der Einsatz fraktaler Landmarken zur kamerabasierten Bestimmung von Position und Orientierung einer autonomen robotischen Plattform untersucht. Die Plattform wird dabei innerhalb eines digitalen Zwillings in einem realit{\"a}tsnahen Szenario simuliert. Ziel ist die robuste und wiederholgenaue Verfolgung einer vom Anwender vorgegebenen Referenztrajektorie. Die in dieser Arbeit genutzen fraktalen Landmarken erm{\"o}glichen durch ihre multiskalige Struktur eine zuverl{\"a}ssige Detektion und Posenbestimmung {\"u}ber einen großen Entfernungsbereich hinweg und adressieren damit die Skalierungsprobleme konventioneller Landmarken. In Kombination mit einer splinebasierten Pfadplanung und einer echtzeitf{\"a}higen Simulation werden die Auswirkungen der Landmarkengeometrie, der Pfadf{\"u}hrung sowie von Bildrauschen auf die Lokalisierungsgenauigkeit analysiert. Die Ergebnisse zeigen, dass der vorgestellte Ansatz eine stabile Posenbestimmung entlang der geplanten Trajektorie erlaubt und sich insbesondere f{\"u}r Anwendungen mit variierenden Arbeitsabst{\"a}nden eignet.}, language = {de} } @inproceedings{ChajonGuentherReiffStephan2026, author = {Chaj{\´o}n, Sebasti{\´a}n and G{\"u}nther, Norman and Reiff-Stephan, J{\"o}rg}, title = {Charakterisierung von Robotersystemen durch Photogrammetrie}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21407}, pages = {201 -- 211}, year = {2026}, abstract = {Industrielle Robotersysteme werden aufgrund der stetig wachsenden Technik der additiven Fertigung zunehmend zug{\"a}ngliche. Die dadurch verringerte Kosten- und Aufwandschwelle f{\"u}hrt zu einer Verbreitung von selbstgebauten Robotersystemen im didaktischen als auch industriellen Kontext, besonders in kleinen- und mittelst{\"a}ndischen Unternehmen. Eigenbauroboter im Gegensatz zu kommerziellen Robotern besitzen keine validierten Leistungsmerkmale. Die Charakterisierung von 3D-gedruckten Robotern ist von besonderer Bedeutung, da das Herstellungsverfahren einen direkten Einfluss auf die charakteristischen Merkmale des Robotersystems hat. Womit die Qualit{\"a}t der Fertigung sowie die Genauigkeit des Roboters wesentlich durch die Raumtemperatur, die Bauart des Druckers, den D{\"u}sendurchmesser, die Schichth{\"o}he sowie das eingesetzte Material determiniert wird. Die Bewertung der Eignung eines Roboters f{\"u}r pr{\"a}zise Aufgaben ist ohne Kenntnis seiner Leistungsmerkmale nur eingeschr{\"a}nkt m{\"o}glich. Die Charakterisierung eines Robotersystems erfolgt anhand unterschiedlicher Methoden, darunter SMR (Sph{\"a}risch Montierter Retroreflektor)-Verfolgung, Photogrammetrie, Laser-Interferometrie, Teleskop-Ballbar und externe Messuhren sowie Taster. Bei einer Vielzahl dieser Ans{\"a}tze entstehen bei der Beschaffung der ben{\"o}tigten Mess- oder Kalibrierungsinstrumente hohe Kosten, was die Wirtschaftlichkeit der additiven Fertigung nicht widerspiegelt und f{\"u}r Anwender von Eigenbaurobotern, insbesondere im didaktischen Kontext, eine Herausforderung darstellt. Als repr{\"a}sentative Leistungscharakteristika stehen hierbei die Positionierung und die Wiederholungsgenauigkeit von Robotersystemen im Fokus und gelten als wesentlich zu ermittelnde Parameter.}, language = {de} } @article{SteglichMaiVillringeretal.2018, author = {Steglich, Patrick and Mai, Christian and Villringer, Claus and Pulwer, Silvio and Casalboni, Mauro and Schrader, Sigurd and Mai, Andreas}, title = {Quadratic electro-optic effect in silicon-organic hybrid slot-waveguides}, series = {Optics Letters}, volume = {43}, journal = {Optics Letters}, number = {15}, issn = {1539-4794}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-12148}, year = {2018}, abstract = {This Letter reports on the quadratic electro-optic effect of polymers, observed in a silicon slot-waveguide at low voltages. We demonstrate that in narrow slots, the electro-optic response with respect to refractive index change is strong enough for on-chip wavelength tuning and intensity modulation using voltages as low as 1 V. A silicon slot-waveguide embedded by a nonlinear optical polymer, consisting of the dye Disperse Red 1 in poly(methyl methacrylate), serves as the phase shifter in a racetrack ring resonator. As deduced from the experimental data, the third-order susceptibility of the utilized electro-optic polymer is about 2·10-19 m2/V2. The demonstrated low-voltage operation and inherently thermal stability show the potential for silicon-organic hybrid devices using the quadratic electro-optic effect.}, language = {en} } @inproceedings{StoldtPrellRabeetal.2021, author = {Stoldt, Johannes and Prell, Bastian and Rabe, Markus and Wenzel, Sigrid and Thiede, Sebastian}, title = {A Criteria-based Database for Research and Applications of Energy-oriented Simulation in Production and Logistics}, series = {Simulation in Produktion und Logistik 2021}, booktitle = {Simulation in Produktion und Logistik 2021}, publisher = {Cuvillier Verlag}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21356}, pages = {93 -- 102}, year = {2021}, abstract = {Within the Section "Simulation in Production and Logistics" of the association for simulation in the German-speaking area (ASIM), the relevance of energy-related considerations led to the foundation of a dedicated scientific workgroup. One of their primary results is a comprehensive literature overview of related approaches from research and industrial perspectives. The experts cooperated to identify, evaluate, and classify relevant literature. Interim findings have been published with special emphasis on logistics and manufacturing. Recently, work was focused on converting the findings into a structured database, to foster the involvement of other experts by providing consistent access to all results in the public domain and to provide means to submit new contributions proactively to the group. Thus, the workgroup intends to raise awareness and motivate other researchers to join the effort. This paper summarises the rationale and methodology of the activities as well as the provision as a public database.}, language = {en} } @article{AdomavičiũtėGrabusovėHinkelUsenovetal.2022, author = {Adomavičiũtė-Grabusovė, Sonata and Hinkel, Jonas and Usenov, Iskander and Novikov, Alexander S. and Sakharova, Tatiana and D{\"o}hler, Torsten and Geißler, Ute and Feliksberger, Elena and Artyushenko, Viacheslav}, title = {Microstructuring of the end-surface for silver halide polycrystalline fibers to suppress Fresnel reflection}, series = {Optical Materials Express}, volume = {12}, journal = {Optical Materials Express}, number = {1}, publisher = {Optica Publishing Group}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-15549}, pages = {34 -- 48}, year = {2022}, abstract = {Silver halide polycrystalline infrared fibers (PIR) have unique properties such as excellent transmittance in the spectral range from 3 to 17 µm, while also being highly flexible, non-toxic, and non-hygroscopic. They are used in industry and medicine for CO2-laser power delivery, flexible infrared imaging, and remote process spectroscopy. While PIR fibers possess a quite low attenuation (0.1-0.5 dB/m) in the 8-12 µm range, their total transmittance is limited by significant Fresnel reflections at the fiber end faces due to the high refractive index of silver halide (>2.1). Functionalization of these surfaces with specially designed Anti-Reflective Microstructures (ARMs) enables a striking enhancement of fiber transmittance. In this work, direct imprinting (or embossing) of microstructures to fiber ends and their profiling with a microstructured knife was applied to fabricate such ARMs. The resulting two-dimensional Moth-eye microstructures and one-dimensional microgrooves at the PIR-fiber ends enable to an increase of fiber transmittance in a broadband range of (5-17 µm) as well as to reach up to 20\% improvement for PIR-fiber laser cables used for power delivery of CO2-lasers at 10.6 µm.}, language = {en} } @inproceedings{BoehmLangmannWilbersetal.2026, author = {B{\"o}hm, Kerstin and Langmann, Mathias and Wilbers, Simon and Reiff-Stephan, J{\"o}rg}, title = {Schicht{\"u}bergabe an den Roboter: ein LLM-gest{\"u}tztes Vorgehensmodell f{\"u}r ambidextre Automatisierung}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21483}, pages = {223 -- 234}, year = {2026}, abstract = {Im Beitrag wird ein transparentes, Large Language Model (LLM)-gest{\"u}tztes Vorgehen zur Organisationsoptimierung am Beispiel einer unbemannten Roboterschicht in cyber-physischen Produktionssystemen vorgestellt. Es operationalisiert ambidextre Automatisierung durch explorative und exploitative Arbeit: Repetitive Anteile wandern zum Roboter, w{\"a}hrend Bediener geplante, auditierbare Bl{\"o}cke f{\"u}r Beobachtung, Lernen, Standardverbesserung und kurze Erholung erhalten - bezeichnet als Explorationsrente. Eine 14-Punkte-Checkliste wird auf flexible operative Datendom{\"a}nen abgebildet; das LLM fragt Retrieval-Augmented Generation (RAG)-gest{\"u}tzte Auswertungen ab, um zwei Stresssignale (Exploration vs. Exploitation) zu berechnen. Daraus leitet es {\"U}bergabevorschl{\"a}ge f{\"u}r die kollaborative Tagesphase, das {\"U}bergabefenster und die unbemannte Schicht ab. Entscheidungen folgen einem Human-in-the-Loop PDCA-Zyklus; die Interaktion kann lokal oder remote erfolgen. Das Konzept wird anhand messbarer Ergebnisse evaluiert: geplante menschliche Zeit, realisierte Roboter-Aktivzeit versus Plan, Unterbrechungen/Leerlauf sowie Akzeptanz. Der Beitrag pr{\"a}sentiert ein Szenario; empirische Schwellenwerte und Gewichtungen verbleiben als zuk{\"u}nftige Arbeit.}, language = {de} } @inproceedings{WalterSzymanskiRieckmannetal.2026, author = {Walter, Elias Fabian and Szymanski, Mateusz and Rieckmann, Olaf and Stolpmann, Alexander}, title = {Deterministische Pr{\"a}diktion menschlicher Bewegungen in der Mensch-Maschine-Interaktion}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21388}, pages = {147 -- 157}, year = {2026}, abstract = {Im Rahmen einer Masterarbeit wurde ein Bildverarbeitungsmodell konzeptioniert und umgesetzt, mit dem die menschliche K{\"o}rperhaltung visualisiert sowie Kollisionen zwischen einem Menschen und einem kollaborativen Roboter vermieden werden k{\"o}nnen. Hierbei wird zun{\"a}chst mittels einer Intel RealSense D435i 3D-Kamera und der Bildverarbeitungsbibliothek Mediapipe die aktuelle K{\"o}rperhaltung der Person bestimmt. Auf Basis einer zeitlichen Abfolge von gemessenen Armgelenkpositionen erfolgt die Berechnung einer zuk{\"u}nftige Armhaltung, welche anatomisch bedingte Gelenkabst{\"a}nde und Gelenkwinkel ber{\"u}cksichtigt. Ein 3D-Avatar als digitaler Schatten - erstellt mithilfe der Unity 3D-Game Engine - visualisiert zeitgleich die aktuelle, als auch die vorhergesagte Gelenkposition. Die prognostizierte Armhaltung ist dar{\"u}ber hinaus Grundlage einer Kollisionsvermeidung mit einem, in Bewegung versetzten, kollaborativen Roboter. Unterschreitet hierbei der berechnete Abstand zwischen der aktuellen Roboter-Haltung und der zuk{\"u}nftigen Armhaltung des Menschen die Grenzen zuvor definierter Kollisionsbereiche, wird der Roboter sofort gestoppt. {\"U}ber eine Versuchsreihe, werden unter Variation von Abst{\"a}nden, Beleuchtungsst{\"a}rken und Materialien die bestm{\"o}glichen Messbedingungen der eingesetzten 3D-Kamera ermittelt. Die Ergebnisse deuten darauf hin, dass helle, glatte Materialien, eine Beleuchtungsst{\"a}rke von 500 lx und ein m{\"o}glichst geringer Abstand von weniger als 1mdie pr{\"a}zisesten Distanzmessungen erm{\"o}glichen. Anhand der durchschnittlichen Zykluszeit wird ein Vorhersagehorizont von bis zu 150ms angenommen.}, language = {de} } @article{TarabrinBushunovTeslenkoetal.2021, author = {Tarabrin, Mikhail K. and Bushunov, Andrey A. and Teslenko, Andrei A. and Sakharova, Tatiana and Hinkel, Jonas and Usenov, Iskander and D{\"o}hler, Torsten and Geißler, Ute and Artyushenko, Viacheslav and Lazarev, Vladimir A.}, title = {Fabrication of an antireflection microstructure on AgClBr polycrystalline fiber by single pulse femtosecond laser ablation}, series = {Optical Materials Express}, volume = {11}, journal = {Optical Materials Express}, number = {2}, publisher = {Optical Society of America}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-15384}, pages = {487 -- 496}, year = {2021}, abstract = {Polycrystalline infrared (PIR) fibers are used for numerous applications, one of those being power delivery for CO2 lasers. However, the fiber tip surface's transmittance cannot be increased with conventional antireflection coatings due to the surface unevenness. Antireflection microstructures (ARMs) offer an alternative way of increasing transmittance. In this work, ARMs were fabricated on the fiber tip surface of an AgClBr fiber by single-pulse femtosecond laser ablation. A single-surface transmittance of 92.8\% at 10.6 μm, a CO2 laser operation wavelength, was achieved. The proposed method can help significantly improve the systems' efficiency, where power delivery for CO2 lasers or sources operating in the wide wavelength range is required.}, language = {en} } @inproceedings{FriedoHauschultzDoehleretal.2026, author = {Friedo, Maria Helene and Hauschultz, Mike Thomas and D{\"o}hler, Torsten and Erhardt, Tom and Jacobs, Hannes and Richetta, Maria and B{\"o}hme, Andrea and Krenz-Baath, Ren{\´e}}, title = {Development of Intelligent Process Automation Strategies to Enhance Selective Laser Melting Performance and Resource Efficiency}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21430}, pages = {299 -- 307}, year = {2026}, abstract = {The research project FASER advances additive manufacturing processes for metallic materials, focusing on Selective Laser Melting (SLM). FASER stands for "Fehlerfreies Additives Fertigen durch adaptive Sensorik zur Optimierung der Energie- und Ressourceneffizienz". Conducted at the Technical University of Applied Sciences Wildau, it implements a comprehensive zero-defect strategy using market-standard equipment like the One Click Metal MPrint+ SLM machine and MPure powder removal station. These systems are enhanced with adaptive multi-sensor technology and intelligent process control to boost quality, cut energy use, and minimize material waste. Central to FASER is flexible camera-based multi-sensor integration, combining optical, thermographic, and spectroscopic methods for real-time monitoring in harsh SLM environments.}, language = {en} } @inproceedings{HauschultzFriedoDoehleretal.2026, author = {Hauschultz, Mike Thomas and Friedo, Maria Helene and D{\"o}hler, Torsten and B{\"o}hme, Andrea and Richetta, Maria and Krenz-Baath, Ren{\´e}}, title = {Layer-by-Layer Process Control in Selective Laser Melting via Customized G-Code Handling}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21449}, pages = {309 -- 317}, year = {2026}, abstract = {Selective Laser Melting (SLM), also commonly referred to as laser powder bed fusion (LPBF), has become a widely adopted technology in metal additive manufacturing for both industrial and research applications. However, many commercial LPBF systems are based on closed hardware and software architectures, which limit transparency, process monitoring, and direct parameter manipulation during ongoing builds. While recent industrial machines increasingly provide standardized interfaces such as OPC UA for monitoring purposes, fine-grained, layer-wise process control remains restricted. The One Click Metal MPrint+ exemplifies this paradigm by relying on proprietary container-based job execution prepared using commercial software tools such as Autodesk Netfabb or Autodesk Fusion 360. This contribution presents an alternative approach that enables user-defined control of the MPrint+ system through a custom-developed G-code handling framework. Instead of executing complete print jobs as opaque containers, the proposed method establishes a direct network connection to the printer using its gRPC interface. Externally generated G-code is extracted, processed, and transmitted layer-wise to the machine, enabling direct interaction with the build process beyond standard job execution. The approach allows controlled variation of process parameters such as exposure strategies, hatch patterns, or recoating behavior during an ongoing build, thereby supporting efficient design-ofexperiment studies without requiring multiple independent print jobs. In addition, individual G-code commands can be executed interactively, enabling didactic use cases in which machine behavior can be directly observed and linked to abstract toolpath descriptions.}, language = {en} } @inproceedings{QuadtGuentherReiffStephan2026, author = {Quadt, Frank and G{\"u}nther, Norman and Reiff-Stephan, J{\"o}rg}, title = {Anwendung von YOLO zur kombinierten Objekterkennung, Personenz{\"a}hlung und Distanzabsch{\"a}tzung}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t : Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t : Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21454}, pages = {319 -- 326}, year = {2026}, abstract = {In der modernen Produktionstechnik ist die Minimierung von Produktionszeiten von zentraler Bedeutung f{\"u}r die Steigerung der Wirtschaftlichkeit. Eine nachhaltige Prozessoptimierung erfordert die Identifizierung und Beseitigung von Schwachstellen und Engstellen innerhalb der Produktionsabl{\"a}ufe. Hierbei spielt die Analyse der Verweildauer von Personen und fahrerlosen Transportsystemen (FTS) an Arbeitsstationen eine entscheidende Rolle. Diese Daten dienen als Indikator f{\"u}r verschiedene Faktoren, darunter die Effizienz der Arbeitsabl{\"a}ufe, die Notwendigkeit von Wartungsintervallen und die Komplexit{\"a}t der Prozesse.Umdiese versteckten Herausforderungen innerhalb der Produktion zu identifizieren, wird in dieser Arbeit ein System zur optischen Datenerfassung vorgestellt. Durch die Erfassung und Analyse der Bewegungen von Personen und FTS in Produktionsumfeld, k{\"o}nnen wertvolle Erkenntnisse gewonnen werden. Ziel ist es, hierdurch ein tiefgreifendes Verst{\"a}ndnis der Produktionsprozesse zu erlangen und fundierte Entscheidungsgrundlagen f{\"u}r gezielte Optimierungsmaßnahmen zu schaffen, die zu einer nachhaltigen Effizienzsteigerung f{\"u}hren.}, language = {de} } @inproceedings{SzymanskiStolpmannRieckmann2026, author = {Szymanski, Mateusz and Stolpmann, Alexander and Rieckmann, Olaf}, title = {Validierung robotergest{\"u}tzter in vivo Messungen im Vergleich zu manuellen Referenzmethoden}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21419}, pages = {235 -- 243}, year = {2026}, abstract = {In vorhergehenden Arbeiten wurden sowohl ein Bildverarbeitungsmodell zur automatisierten Erkennung von Messarealen als auch Studien zur Akzeptanz robotergest{\"u}tzter in vivo-Messungen entwickelt und erprobt. Auf dieser Grundlage wurde ein prototypischer Hautmessroboter aufgebaut, der Anforderungen an Ergonomie, Sicherheit und Bedienbarkeit integriert. Im vorliegenden Beitrag wird eine erste Validierungsstudie vorgestellt, in der robotergest{\"u}tzte Messungen systematisch mit manuellen Referenzmessungen verglichen werden. Die Ergebnisse zeigen eine insgesamt hohe Korrelation zwischen manueller und robotergest{\"u}tzter Messung f{\"u}r beide untersuchten Hautparameter. Nach Produktanwendung zeigen die Ergebnisse, dass mit der robotergest{\"u}tzten Messung statistisch signifikante Produkteffekte erfasst werden k{\"o}nnen. Die Resultate deuten darauf hin, dass robotergest{\"u}tzte in vivo Messungen ein hohes Potenzial f{\"u}r den Einsatz im dermatologischen Studienbetrieb haben k{\"o}nnen.}, language = {de} } @inproceedings{HeinrichKrachtEhrhardtetal.2026, author = {Heinrich, Moritz and Kracht, Christopher and Ehrhardt, Tom and D{\"o}hler, Torsten and B{\"o}hme, Andrea and Krenz-Baath, Ren{\´e}}, title = {Metall-3D-Druck Wissensvermittlung in der Lehre durch den Einsatz von XR-Technologien}, series = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t : Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, booktitle = {Tagungsband AALE 2026: Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t : Mechatronische Systeme f{\"u}r die Automatisierung: Fortschritt durch Pr{\"a}zision und Qualit{\"a}t}, publisher = {Hochschule f{\"u}r Technik, Wirtschaft und Kultur Leipzig}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21427}, pages = {269 -- 278}, year = {2026}, abstract = {Das EU/ILB-gef{\"o}rderte Projekt MINT'oVation verfolgt ein XR-gest{\"u}tztes Lehrkonzept zur Vermittlung von Grundlagen und Prozessen des metallischen 3D-Drucks mit Fokus auf das Selective Laser Melting (SLM). Ziel ist der Aufbau eines fundierten technologischen Verst{\"a}ndnisses dieser industriellen Schl{\"u}sseltechnologie sowie die anschauliche, sichere und niedrigschwellige Vermittlung komplexer metallphysikalischer Zusammenh{\"a}nge. Das didaktische Design orientiert sich am Cognitive-Affective Model of Immersive Learning (CAMIL) und nutzt visuelle Immersion, Interaktion und spielerische Elemente zur F{\"o}rderung von Motivation, Aufmerksamkeit und nachhaltigem Wissenserwerb. In der virtuellen Umgebung k{\"o}nnen Prozesse, Experimente und Demonstrationen risikofrei und ohne kostenintensive Anlagen durchgef{\"u}hrt werden. Der modular aufgebaute Kurs umfasst unter anderem eine Einf{\"u}hrung in XR-Technologien, metallphysikalische Grundlagen, additive Fertigungsverfahren, CAD-Konstruktion sowie den vollst{\"a}ndigen Prozess von der Modellierung bis zur Druckdurchf{\"u}hrung. Zum Einsatz kommen marktg{\"a}ngige, hardwareunabh{\"a}ngige XR-Systeme, beispielhaft Apple Vision Pro oder Meta Quest 3. Das Angebot richtet sich an Studierende, Auszubildende, Sch{\"u}ler* innen, Arbeitssuchende und weitere Interessierte ohne n{\"o}tiges Vorwissen und unterst{\"u}tzt gezielt Inklusion und Chancengleichheit. Zwischen April und Dezember 2025 verzeichnete der Kurs 97 Anmeldungen, davon 82 f{\"u}r den vollst{\"a}ndigen Kurs; 66 Teilnehmende schlossen diesen bereits erfolgreich ab. Die hohe Nachfrage unterstreicht das Potenzial immersiver XR-Lehrformate zur nachhaltigen Qualifizierung im Bereich der additiven Fertigung und zur Vorbereitung auf einen sich wandelnden Arbeitsmarkt.}, language = {de} } @misc{HeinrichSeydewitzWildenaueretal.2015, author = {Heinrich, Moritz and Seydewitz, Tobias and Wildenauer, Franz-Xaver and Pospisil, Heike}, title = {Bioprozessautomatisierung einer Algenanlage mithilfe eines Single-Board-Computers}, series = {Wissenschaftliche Beitr{\"a}ge 2015}, volume = {19}, journal = {Wissenschaftliche Beitr{\"a}ge 2015}, issn = {0949-8214}, doi = {10.15771/0949-8214_2015_1_1}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-3515}, pages = {7 -- 14}, year = {2015}, abstract = {F{\"u}r die effektive Haltung von Mikroorganismen, kleinen Pflanzen oder Algen in Bioreaktoren ist die Aufrechterhaltung optimaler Kultivierungsbedingungen, wie beispielsweise pH-Wert, Temperatur oder N{\"a}hrstoffgehalt, notwendig. Diese Parameter k{\"o}nnen sich w{\"a}hrend der Kultivierung {\"a}ndern, weshalb sie regelm{\"a}ßig kontrolliert und gegebenenfalls angepasst werden m{\"u}ssen. Wir pr{\"a}sentieren hier den technischen Aufbau und die Softwarerealisierung eines Automatisierungssystems zur autonomen Regulierung des pH-Wertes in Bioreaktoren, in denen die gr{\"u}ne Mikroalge Scenedesmus rubescens kultiviert wird. Dazu wurde ein System mit pH-Sensoren, Signalwandlern und Magnetventilen zur kontrollierten CO2-Begasung aufgebaut. F{\"u}r die Steuerung und die Datenaufzeichnung diente ein Single-Board-Computer (Raspberry Pi) mit Webeserver. Die Anlage war voll funktionsf{\"a}hig und konnte {\"u}ber mehrere Tage fehlerlos den pH-Wert auf einen vorgegebenen Wert regeln. Das System ist leicht auch auf Großanlagen und f{\"u}r andere Parameter erweiterbar. Durch die Nutzung eines Single-Board-Computers erfordert die Anlage nur minimalen Platz- und Energiebedarf und ist mit geringen Anschaffungskosten verbunden.}, language = {de} } @inproceedings{HeinrichStollfussJacobsetal.2023, author = {Heinrich, Moritz and Stollfuss, Carsten and Jacobs, Hannes and Di Vona, Maria Luisa and Pizzoferrato, Roberto and Foitzik, Andreas}, title = {A conductivity-based, batch-optimized system for analyzing the total of carbon parameter in water}, series = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, booktitle = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, editor = {Stolzenburg, Frieder and Reinboth, Christian and Lohr, Thomas and Vogel, Kathleen}, publisher = {Hochschule Harz}, address = {Wernigerode}, issn = {2627-5708}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18598}, pages = {15 -- 20}, year = {2023}, abstract = {In cooperation with the company Purification Membranes Analytics GmbH (PMA), a prototype has been developed that analyzes the total organic carbon (TOC) content of water samples based on a complex conductivity measurement. In the process, a batchoptimized system was developed that delivers qualitative results even in highly polluted waters. This method requires small sample volumes and was assembled using an ultrapure water system, a sample mixing system, various electronic control units and a miniTOC system that uses a UV light source to decompose organic carbons and outputs differential values using two conductivity sensors. During the project, a fully automated prototype was developed and is ready for use. In the future, this method could support common methods and lead to more accurate statements on water quality in a cost-effective manner.}, language = {en} } @inproceedings{HeinrichJacobsDiVonaetal.2022, author = {Heinrich, Moritz and Jacobs, Hannes and Di Vona, Maria Luisa and Pizzoferrato, Roberto and Foitzik, Andreas}, title = {A Test System for Safely Measurements of Cancer-Inducing UV-C Diodes Produced in a Simple and Cost-Effective Way by Rapid Prototyping}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17682}, pages = {197 -- 199}, year = {2022}, abstract = {New technologies leading to better and more efficient light emitting diodes. The emitted radiation reaches higher energy levels and lower wavelengths especially in the UV-C spectrum. UV-C light has a cancer inducing effect on human cells. Therefore it is necessary to work in a safe way with those devices. This work is focused on an open-source solution for rapid 3D printing of an safe UV-C radiation measuring device. Especially for research groups or universities which can not afford big safety labs. After modeling and printing the prototype, a series of tests has shown the functionality of that UV-C Diode test system. By using black printing filaments and infill rates over 50 \%, the transmission of light could be prevented and the system worked well.}, language = {en} } @inproceedings{DoehlerBoehmeHofmannetal.2022, author = {D{\"o}hler, Torsten and B{\"o}hme, Andrea and Hofmann, Mandy and Neumann, Jens and Bochem, Reinhard and Foitzik, Andreas and Geißler, Ute}, title = {Mikrogalvanische Kennzeichnung als Kopierschutz}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17624}, pages = {157 -- 161}, year = {2022}, abstract = {In order to achieve good product quality in electroplating, disturbance variables such as the "dog bone" effect must be avoided. In this work, this approach was used to develop a method for marking as product protection. With a defined structure and optimal parameters, it is possible to deposit unique visually non-differentiable layers on suitable substrates. The deposited layers and their local distribution were characterized by confocal laser microscopy, X-ray fluorescence analysis and laser interference measurements and analyzed qualitatively as well as quantitatively. It thus provides interested parties with an essentially traditional process that can lead to new innovations with the chosen approach.}, language = {de} } @inproceedings{HauschultzFriedoJacobsetal.2022, author = {Hauschultz, Mike Thomas and Friedo, Maria Helene and Jacobs, Hannes and Lafta, Mohammad and Engels, Andreas and Foitzik, Andreas}, title = {Low-cost Pipettierroboter auf Basis einer Portalfr{\"a}se}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17649}, pages = {187 -- 191}, year = {2022}, abstract = {Zur Herstellung von langfristig stabilen Metall-Kautschuk-Verbunden sind chemische Haftvermittler notwendig. Nach Auftrag dieser wird Kautschuk mittels Gummispritzgießen auf die metallischen Grundk{\"o}rper aufgebracht. In Klein- und Kleinstserien kann der Haftvermittler in pr{\"a}zisen Volumina h{\"a}ndisch mit Hilfe eines Fluid-Dispensers aufgetragen werden. Allerdings verhindert dies eine Homogenit{\"a}t und Gleichheit der Schichtdicke, wodurch die Zuverl{\"a}ssigkeit und St{\"a}rke der Haftung variieren k{\"o}nnen. Als technische L{\"o}sung wurde ein Pipettierroboter avisiert. Mit Hilfe mehrerer mechanischer und elektrischer Adaptionen - so auch einer neuen Steuerungstechnik - wurden verschiedene Fluid-Dispenser auf 3-Achs-Portalfr{\"a}sen integriert. Somit konnte die volle Funktionsf{\"a}higkeit erreicht werden.}, language = {de} } @article{BoehmeDoehlerHofmannetal.2023, author = {B{\"o}hme, Andrea and D{\"o}hler, Torsten and Hofmann, Mandy and Neumann, Jens and Bochem, Reinhard and Geißler, Ute and Foitzik, Andreas}, title = {Electrolytical Coating of Inhomogeneous Structures Distributed on Metallic Surfaces}, series = {Materials Science Forum}, volume = {1106}, journal = {Materials Science Forum}, publisher = {Trans Tech Publications}, issn = {0255-5476}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18825}, pages = {75 -- 80}, year = {2023}, abstract = {In modern electrochemical coating technology, it is common practice to create uniform layers. However, this study focuses on the deposition of non-uniform layers achieved through a deliberate arrangement of micro structured electrodes on the anode side. The "dog bone effect" was employed as the primary approach [1]. When electroplating on an otherwise uniform surface, this effect selectively processes an area influenced by the geometric edge effect (figure 1 left). The coating within this area is intended to be (i) unevenly distributed and (ii) non-reproducible. Process data was obtained through electrochemical simulations and subsequently applied to a specially designed micro-galvanic setup. This enabled the production of suitable micro structured anodes, validation of coating parameters, and the deposition of visually imperceptible structured areas with inhomogeneous properties using "adhesive gold" on appropriate substrates such as silver and nickel. The layers and their local topography were characterized and analyzed using confocal laser microscopy, X-Ray fluorescence analysis (XRF), as well as a self-designed and constructed laser interference device. As a result, this specific galvanic process technology successfully produced metallic layers that (i) cannot be visually confirmed by the naked eye, (ii) exhibit varied microstructural anode geometries, (iii) display unique differences in layer thickness, (iv) possess non-reproducible and chaotic topographies, and (v) can be detected and identified using conventional analysis techniques or a simple interference setup.}, language = {en} } @inproceedings{FriedoHauschultzDoehleretal.2023, author = {Friedo, Maria Helene and Hauschultz, Mike Thomas and D{\"o}hler, Torsten and B{\"o}hme, Andrea and Richetta, Maria and Foitzik, Andreas}, title = {Sustainable production of injection moulds through additive manufacturing and improved application of energy management}, series = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, booktitle = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, editor = {Stolzenburg, Frieder and Reinboth, Christian and Lohr, Thomas and Vogel, Kathleen}, publisher = {Hochschule Harz}, address = {Wernigerode}, issn = {2627-5708}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18600}, pages = {298 -- 302}, year = {2023}, abstract = {The concept of this thesis is to optimize the manufacturing process of injection moulding tools by using additive manufacturing and thus contribute to environmental protection. For this purpose, the individual steps of the traditional manufacturing process are identified and analysed to determine which steps can be replaced by additive manufacturing. The first step is to clarify which mould components can benefit from additive manufacturing. In particular, the capabilities and limitations of additive manufacturing technologies must be considered. Furthermore, another focus is on how to optimize the cooling and temperature control of the tools. Potential savings through the use of lightweight or insulating surfaces will be examined. In addition to the technical feasibility, the cost-effectiveness of the concept will also be considered. Finally, the contribution of the concept to the reduction of the environmental impact will be evaluated. In particular, energy savings and the reduction of CO2 emissions are taken into account. The potential to optimize the injection mould manufacturing process and reduce environmental impact is significant. Using additive manufacturing can be an economic and environmental advantage.}, language = {en} } @inproceedings{WelzelHauschultzKrumnowetal.2023, author = {Welzel, Felix and Hauschultz, Mike Thomas and Krumnow, Erik and Foitzik, Andreas and Richetta, Maria}, title = {Concept and simulation of micromixers and aliquoting for PCR systems}, series = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, booktitle = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, editor = {Stolzenburg, Frieder and Reinboth, Christian and Lohr, Thomas and Vogel, Kathleen}, publisher = {Hochschule Harz}, address = {Wernigerode}, issn = {2627-5708}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18611}, pages = {303 -- 306}, year = {2023}, abstract = {In this paper, different concepts for mixing sample and master mix by means of simulation are discussed. The main focus was on mixers with a low dead volume, because of their relevance to PCR. In addition, a concept for aliquoting the mixed solution was elaborated and simulated. The simulation showed very good mixing with serpentineand tesla-mixers at flow rates of 1-16 µL/s. Furthermore, a uniform distribution with aliquoting could be achieved, while a slight dependence between flow rate and pressure was observed. In the further course, these concepts are to be combined and tested on a microfluidic chip. This can then be integrated into the workflow of existing PCR protocols.}, language = {en} } @inproceedings{FriedoHauschultzJacobsetal.2022, author = {Friedo, Maria Helene and Hauschultz, Mike Thomas and Jacobs, Hannes and Lafta, Mohammad and Engels, Andreas and Foitzik, Andreas}, title = {Steuerungstechnik f{\"u}r das Auftragen von fluiden Haftvermittlern}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17670}, pages = {217 -- 219}, year = {2022}, abstract = {The goal of this project was to enable an automated solution for the application of bonding agents to metallic bodies in the nanoliter range. For the automated application of adhesion promoters, a new control unit based on a mainboard for controlling 3D printers was used, with Marlin serving as the firmware. Adaptations were necessary in the area of motor currents, speeds, acceleration, sensitivity, print bed size and selection of mainboard and display. For the traverse paths, G-code was generated using a program in Python. For homogeneous and uniform wetting, the individual objects to be wetted are approached and the pipetting process is controlled. It was possible to establish the complete functionality.}, language = {de} } @inproceedings{WelzelHauschultzFriedoetal.2022, author = {Welzel, Felix and Hauschultz, Mike Thomas and Friedo, Maria Helene and Just, Verena and Richetta, Maria and Foitzik, Andreas}, title = {Concept for a Portable Measuring Device for the Quantitative Detection of Legionella}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17616}, pages = {15 -- 17}, year = {2022}, abstract = {According to the drinking water regulation, drinking water systems must be tested for harmful contamination at specified intervals. To meet the legal requirements and save costs and time, a portable analysis method is to be developed. For this purpose, a concept study was conducted. It describes a portable measuring device for the quantitative detection of legionella using real-time PCR. The study includes the construction elements and conditions that are necessary for the collection, processing, and evaluation of the sample. It was found that commercially available PCR systems do not meet the size requirements and can only be represented by an in-house development. In addition, a microfluidic system must be developed that is designed for one-time use and low production cost.}, language = {en} } @inproceedings{StrauchWellmannFriedoetal.2022, author = {Strauch, Jessica and Wellmann, Martin and Friedo, Maria Helene and Welzel, Felix and Foitzik, Andreas}, title = {Miniaturisierung einer Smartwatch f{\"u}r Hautfeuchtesensorik}, series = {Open Conference Proceedings}, volume = {2}, booktitle = {Open Conference Proceedings}, publisher = {TIB Open Publishing}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-17653}, pages = {193 -- 195}, year = {2022}, abstract = {Das Ziel des Projekts ist, den Zustand der Haut von Neurodermitis-Patienten bei verschiedenen Bedingungen und Belastungszust{\"a}nden erfassen zu k{\"o}nnen. Dazu wurde ein Prototyp gefertigt, in den ein Mikrosensor zur Bestimmung der Umgebungsfeuchtigkeit, ein Controller mit Bluetooth zur Daten{\"u}bertragung, sowie ein Lithium-Akku zur Energieversorgung verbaut wurden.}, language = {de} } @article{HeuerKrenzBaathObermaisser2024, author = {Heuer, Joseline and Krenz-Baath, Ren{\´e} and Obermaisser, Roman}, title = {Human-heart-model for hardware-in-the-loop testing of pacemakers}, series = {Computers in Biology and Medicine}, volume = {180}, journal = {Computers in Biology and Medicine}, issn = {0010-4825}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-19423}, year = {2024}, abstract = {To guarantee the safety of medical devices, including embedded systems, it is essential to consider both electronic components and the natural environment during validation and verification. In contrast to prior research, we present a hardware-in-the-loop environment that connects a real medical system to a biological model in real time for validation, including the modeling of the mechanical component of the heart valves in addition to the modeling of the electrical conduction and electrical stimulation of the heart chambers. Our model accounts for the dynamic adaptation of the temporal processes in the heart chambers to the pacing frequency of the individual chambers as a function of the action potential. This study investigates two additional risk factors affecting the heart under different conditions: pacemaker syndrome and electrical stimulation during the vulnerable phase. Both can be life-threatening to the patient if left untreated. In implementing our concept on a physical pacemaker connected to our software-based model of the heart, we discovered that the test pacemaker was unable to generate the required heart rate in three of the scenarios we tested. Additionally, our tests revealed occurrences of pacemaker syndrome and stimulation in the vulnerable phase.}, language = {en} } @article{FelkeGrothHempeletal.2024, author = {Felke, Florens and Groth, Anne and Hempel, Martin and Czerny, Bernhard and Khatibi, Golta and D{\"o}hler, Torsten and Geißler, Ute}, title = {Effect of the loop forming process on the lifetime of aluminum heavy wire bonds under accelerated mechanical testing}, series = {Microelectronics Reliability}, volume = {154}, journal = {Microelectronics Reliability}, publisher = {Elsevier}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18631}, year = {2024}, abstract = {Heavy wire bonding is one of the most common interconnection technologies in manufacturing of high-power electronics. For industrial applications, the long-term reliability of these connections is crucial. Besides the selection of the wire material and the loop geometry itself, the loop forming process parameters also have an influence on the reliability of the wire bond. In this work, the influence of the backward bond head movement during wire bonding process on the quality of wire bond connections was systematically investigated and qualified by cyclic mechanical lifetime tests, surface roughness measurements of the heel area by laser confocal microscopy and static pull tests. The wire bond loops were fabricated with 300 μm aluminum H11 and H14CR wires with different hardness values. The lifetime at low frequency cycle and high frequency cycle regime was determined by means of two different mechanical cyclic test methods operating at 5 Hz and at 60 kHz respectively. The results have shown, that the surface topology of the heel region caused by the initial plastic deformation during the loop forming process has a significant effect on the wire bond failure due to heel cracking. The number of loading cycles to failure shows an inverse correlation with the degree of surface roughness in a so called wrinkling analysis in the low and high frequency cycle regime. The soft wire exhibits different lifetimes compared to the hard ones depending on the testing conditions, while a significant decrease of the lifetime is observed with >30 \% reverse movement during bonding in all cases.}, language = {en} } @article{HauschultzFriedoGeissleretal.2026, author = {Hauschultz, Mike Thomas and Friedo, Maria Helene and Geißler, Ute and B{\"o}hme, Andrea and Krenz-Baath, Ren{\´e}}, title = {Influence of Process Parameters Variation on Microstructure and Mechanical Properties of SLM-Printed 316L Stainless Steel}, series = {Solid State Phenomena}, volume = {383}, journal = {Solid State Phenomena}, publisher = {Trans Tech Publications}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21048}, pages = {75 -- 80}, year = {2026}, abstract = {This study presents the characterization of 316L stainless steels fabricated by selective laser melting (SLM), focusing on the influence of printing parameters on microstructure and mechanical properties. The choice of process parameters is crucial for achieving desired material properties, as it directly affects the microstructure and mechanical behavior, which is important when optimizing for potential applications in several fields, such as aerospace and automotive. In this study, different scanning speeds were tested to identify optimal settings, followed by the evaluation of the effects of orientation relative to the build plate and hatching strategies to enhance performance. To assess the impact of these factors, tensile tests, microhardness measurements, and X-ray diffraction (XRD) analyses were conducted. Tensile tests revealed that higher laser scanning speed generally reduces ultimate tensile strength and elongation, likely due to an increase in porosity and a less homogeneous fusion of layers. The analysis of samples printed with different orientation relative to the build plate highlighted a strong mechanical anisotropy, with the samples printed vertically exhibiting lower tensile strength and ductility compared to horizontally printed samples. Microhardness testing further confirmed an anisotropy in material properties. XRD analysis reveals a preferential orientation of austenitic grains depending on building direction. This, in turn, influences the anisotropic behavior. These findings highlight the critical role of process parameters in tailoring the microstructure and mechanical performance of SLM-produced parts, thereby providing insights into the optimization of additive manufacturing for specific applications.}, language = {en} } @inproceedings{HauschultzFriedoDoehleretal.2023, author = {Hauschultz, Mike Thomas and Friedo, Maria Helene and D{\"o}hler, Torsten and B{\"o}hme, Andrea and Richetta, Maria and Foitzik, Andreas}, title = {Additive Manufacturing of Electrodes: Innovative Applications and Opportunities}, series = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, booktitle = {NWK 2023 - Tagungsband zur 23. Nachwuchswissenschaftler*innenkonferenz}, editor = {Stolzenburg, Frieder and Reinboth, Christian and Lohr, Thomas and Vogel, Kathleen}, publisher = {Hochschule Harz}, address = {Wernigerode}, issn = {2627-5708}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-18621}, pages = {292 -- 297}, year = {2023}, abstract = {Additive manufacturing, also known as 3D printing, has gained tremendous importance in recent years. One of the areas where additive manufacturing is particularly useful is in the fabrication of electrodes. Electrodes are an important component of a wide range of applications, including electrochemistry, biomedical engineering, energy storage, analytics, electronics as well as life sciences. Traditionally, electrodes have been manufactured through costly processes such as etching, electroplating or cutting and milling. Additive manufacturing offers a new way to fabricate electrodes by depositing materials layer by layer (Yap et al., 2015). This opens up new possibilities for designing electrodes with complex geometries and structures that would not be possible using conventional methods. As a result, 3D printed electrodes are gaining interest in fields such as electromobility, water disinfection, manufacturing, and life sciences, which will be presented in this paper.}, language = {en} } @article{EngelsSpeckSchlegeletal.2026, author = {Engels, Andreas and Speck, Sandy and Schlegel, Volker and Jacobs, Hannes and Krenz-Baath, Ren{\´e} and B{\"o}hme, Andrea}, title = {Substrate Tubing Heater Suitable for Large Volume 3D Printing with Extrusion of Thermo-Reversible Hydrogels}, series = {Key Engineering Materials}, volume = {1038}, journal = {Key Engineering Materials}, publisher = {Trans Tech Publications}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21092}, pages = {25 -- 30}, year = {2026}, abstract = {The advancement of 3-dimensional printing technology over the past ten years has raised interest in and accessibility to these devices. Due to its consistent growth and demand, 3D printing is becoming a consumer-friendly, reasonably priced craft. Due to technological advancements, it is becoming increasingly integrated into broader fields of science and research, as well as the manufacturing sector. The need for customized solutions is constantly growing across several industries. The 3D extrusion of hydrogels is advancing in the field of biomaterials with a broad spectrum of biomedical applications. Hydrogel extrusion prints heads often use stepper motors or pneumatic pressure systems to push the substrate onto a surface. These techniques are well-suited for materials with high viscosity. While these systems are usually bound to the syringe volume, a refillable reservoir enables them to print above the syringe's limitations. We developed a low-cost standalone heating system for flexible tubes to control the temperature, hence avoiding jellification and clogging of the tubing system leading to the nozzle of the print head. The system connects to an in-house made peristaltic pump, which forces the e.g. gelatin through the nozzle with low pulsation, enabling us to extrude multiple layers of precise tempered gelatin. The heating system is based on easily available materials and electronic components and does not require expensive tools.}, language = {en} } @article{WernerProspositoBoehmeetal.2026, author = {Werner, Ronald and Prosposito, Paolo and B{\"o}hme, Andrea and Krenz-Baath, Ren{\´e}}, title = {Optimization of Hydrogen Alarm Sensor on Semiconductor Basis}, series = {Key Engineering Materials}, volume = {1039}, journal = {Key Engineering Materials}, publisher = {Trans Tech Publications}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21104}, pages = {9 -- 14}, year = {2026}, abstract = {A semiconductor based hydrogen sensor system was optimized by various modifications, which allow an improved detection of very low concentrations of hydrogen in air. The foundation for new investigations on the sensor structure are modifications of substrate and gate structures. Establishment of reference structures is a major aim. A possible drift compensation could be the use of aluminum or alloys for sensor system in order to stabilize signal in Metal Oxide Semiconductor (MOS) respectively Metal Electrolyte Insulator Semiconductor (MEIS) structures. Gold is more likely not capable to function for drift compensation as a pure metal. Nafion™ treatment for cover up the palladium gate seems not to be suitable as a reference, besides could be an option to stabilize sensor signal responses and protect sensors from environmental influences.}, language = {en} } @inproceedings{AlarconSchneiderKamenzkyetal.2019, author = {Alarc{\´o}n, Daniel and Schneider, Sarah and Kamenzky, Robert and Blaschke, Peter}, title = {Across the Picket Fence: Influence of Sampling Frequency in Automatic Impact Modal Testing}, series = {Special Topics in Structural Dynamics, Volume 5 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, booktitle = {Special Topics in Structural Dynamics, Volume 5 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, publisher = {River Publishers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21515}, year = {2019}, abstract = {Automatic impact modal testing is a technique gaining momentum in recent years thanks to the popularization of Scanning Laser Doppler Vibrometry. These systems allow automatizing the output measurement of thousands of degrees of freedom in a short time. The use of automatic impact modal hammers allows automatizing the excitation input and broadband excitation without loading a structure with an extra mass or other drawbacks. However, the impact force repeatability is a prominent concern among test engineers, especially those who work with materials with non-proportional force/response ratios. Assessing the impact force repeatability of a given automatic modal hammer or test rig is necessary in order to ensure the right response level is measured impact after impact. The assessment procedure can be misleading if not done right. Studying the automatic modal hammer repeatability under typical modal test conditions invariably leads to impact signals strongly distorted by the so called picket fence effect. This results in impacts sampled by only 3-4 data points; insufficient to accurately describe the actual impact force signals and the short contact times between hammer tip and structure. In the reality, the impacts are of larger magnitudes and shorter contact times than what is shown by the analyzer in typical test conditions. This work studies the influence of the sampling frequency and the test structures used on the repeatability assessment of automatic impact modal hammers. Impact force signals are acquired in this work with enough resolution to eliminate the picket fence effect and truly evaluate how repeatable and reproducible automatic impacts are. The practicality of the procedure, which involves very large datasets and long testing times, is discussed. Guidelines are offered at the end of the paper for a successful repeatability and reproducibility assessment of automatic impact modal hammers.}, language = {en} } @inproceedings{SchneiderMallareddyAlarconetal.2019, author = {Schneider, Sarah and Mallareddy, Tarun Teja and Alarc{\´o}n, Daniel and Kamenzky, Robert and Blaschke, Peter}, title = {Experimental Modal Analysis of Structures with Conventional Versus Contact-Free Suspension}, series = {Special Topics in Structural Dynamics, Volume 5 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, booktitle = {Special Topics in Structural Dynamics, Volume 5 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, publisher = {River Publishers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21533}, year = {2019}, abstract = {The existence of free boundary conditions is frequently assumed for Experimental Modal Analysis (EMA) of a structure. However, free-free conditions can only be approximated because the structure must be supported in some manner. Therefore, comparing simulated data with experimental data can be deceiving, because these suspensions falsify modal parameters especially structural damping and stiffness. The current scenario of structural analysis is more towards focusing on modal updating or correlation, rather than the simulation results (FE) or the experimental results. So it is imperative to bridge the gap between FE and EMA, by carefully studying various parameters. To overcome these drawbacks, levitation is suggested as a truly free-free suspension method. The levitation method was developed to allow a non-destructive, adaptable, and completely contactless approach for material testing: the structure under test is suspended on a thin film of pressurized air providing an aerodynamic bearing, levitating the specimen. Two suspension devices were constructed. Pressurized air is circulated into a casing with a single outlet ("air cushion") or a fine grid of outlets ("air bed"). A study was performed to investigate the influence of the support conditions on the modal parameters eigenfrequency and damping. Tested specimens were a brass plate, a stainless steel plate and two composite material probes. The tested suspension methods were (a) foam mat, (b) air cushion and (c) air bed. Modal tests were performed using a Scanning Laser Doppler Vibrometer (SLDV) and an automatic modal hammer for excitation. Evaluations of the measurements were performed manually. The results showed that the detected eigenfrequencies of the metallic specimen have a variation below ±0.3\% for the tested suspension methods. This variation is 10 times higher for the composite plates and lies between ±3\%. The damping ratios of the levitation suspensions show the different material behavior of metallic and composite specimen: damping ratios of metallic specimen lie between 0.05-0.5\% whereas damping ratios of composite plates are ten times higher and lie between 0.3\% and 3\%. The damping ratios measured with the air cushion are smaller than the damping ratios for the air bed supporting the hypothesis that a laminar air film under the specimen leads to less additional damping. The study shows that EMA can be performed on metallic and composite specimens using contact-less suspension methods. Especially for light-weight material specimens where EMA cannot be performed or where the results are not reliable, the contact-less suspension (levitation method) can be used.}, language = {en} } @inproceedings{MallareddyAlarconSchneideretal.2019, author = {Mallareddy, Tarun Teja and Alarc{\´o}n, Daniel and Schneider, Sarah and Blaschke, Peter}, title = {The Influence of Geometrical Correlation in Modal Validation Using Automated 3D Metrology}, series = {Rotating Machinery, Vibro-Acoustics \& Laser Vibrometry, Volume 7 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, booktitle = {Rotating Machinery, Vibro-Acoustics \& Laser Vibrometry, Volume 7 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, publisher = {River Publishers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21524}, year = {2019}, abstract = {Structural analysis is a major part of all manufacturing and testing industries. The need for high level accuracy of the results in the testing field has increased progressively, resulting in development of advanced state of art techniques. In order to acquire the vibrational characteristics of a structure, a detailed Finite Element Analysis (FEA) modelling is performed. Also, Experimental Modal Analysis (EMA) is conducted to extract the dynamic characteristics of a structure. The results obtained from both the processes are correlated for validation purposes. Based on the correlation (good or bad) the structural analysis is validated. In most cases the correlation is not satisfactory; it is mainly because of the boundary conditions that differ in FE and EMA. This research study explains in detail how important the boundary conditions are for modal validation. But the most imperative part, as the first step of correlation, is the geometry analysis. If the geometrical correlation is not accurate, the later part of correlation will turn out to be an assumption based on inaccuracies. Assumption of a geometrical correlation, without being sure of the differences, will lead to inaccurate results for validation. A reference plate is tested and simulated by using EMA and FEA techniques respectively. EMA is conducted by using a 3D SLDV for measuring the output response and the input force of excitation is induced by a Scalable Automatic Modal hammer (SAM). This plate is then scanned using ATOS Triple Scan II GOM 3D geometry scanner. The scanned results are compared with the FE model of the reference plate. The results presented show the importance of geometrical correlation for modal validation and provide results of deviations that were observed on a reference plate. With these conclusions, working on modal validation can be developed by reducing the inaccuracies for the presentation of correlation.}, language = {en} } @inproceedings{MallareddySchneiderBlaschke2019, author = {Mallareddy, Tarun Teja and Schneider, Sarah and Blaschke, Peter}, title = {Advanced Hammer Excitation Technique for Impact Modal Testing on Lightweight Materials Using Scalable Automatic Modal Hammer}, series = {Topics in Modal Analysis \& Testing, Volume 9 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, booktitle = {Topics in Modal Analysis \& Testing, Volume 9 : Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018}, publisher = {River Publishers}, url = {http://nbn-resolving.de/urn:nbn:de:kobv:526-opus4-21508}, year = {2019}, abstract = {Experimental Modal Analysis (EMA) on a lightweight material has proven to be very challenging in the recent past. The applications of these materials have increased invariably in various fields and so have a high demand for Research \& Development (R\&D). A lightweight material is very sensitive in terms of vibration. EMA on these materials in free - free boundary condition is very complicated as the hammer excitation becomes very difficult. In order to acquire valid results, the conditions are modified, and in consequence, obtain inaccurate dynamic characteristics. Some of the major challenges faced are: (a) material getting displaced from its original position after every hit, (b) difficulties in obtaining a single hit, (c) reproducing the same excitation force level for averaging output response. Overcoming these crucial challenges can result in reducing the inaccuracies in the results. Scalable Automatic Modal hammer (SAM) is developed to overcome these challenges and enables the ability to reproduce the same force level of excitation. This advanced hammer excitation technique has the capability to avoid the double hit, adjust the repeatability of force level and automatizes the entire excitation process. In this research paper, a light weight material is experimented under free-free boundary condition and the obtained results are analyzed. The input hammer excitation is provided by SAM and the output contactless response is measured by Scanning Laser Doppler Vibrometer (SLDV). The conclusions provided will reflect the importance of repeatability and reproducibility of hammer excitation force level in order to acquire accurate results. The controlling of SAM, by changing various parameters, in order to precisely excite lightweight structures will be demonstrated.}, language = {en} }