@inproceedings{RauerXuReinhardtetal.2016, author = {Rauer, Miriam and Xu, Ping and Reinhardt, Andreas and Kaloudis, Michael and Franke, J{\"o}rg}, title = {Einfluss von Poren in L{\"o}tverbindungen bei LED-Anwendungen}, series = {Elektronische Baugruppen und Leiterplatten - EBL 2016}, booktitle = {Elektronische Baugruppen und Leiterplatten - EBL 2016}, publisher = {VDE Verlag}, address = {Berlin}, isbn = {978-3-8007-4147-2}, pages = {135 -- 139}, year = {2016}, subject = {L{\"o}tverbindung}, language = {de} } @article{SahlKaloudis2010, author = {Sahl, Martin and Kaloudis, Michael}, title = {Einsatz von Glasloten zur Erzeugung gasdichter F{\"u}gestellen beim Aufbau von Drucksensoren}, series = {PLUS}, journal = {PLUS}, number = {12}, publisher = {Leuze-Verlag}, address = {Bad Saulgau}, pages = {1367}, year = {2010}, subject = {Drucksensor}, language = {de} } @article{RauerKaloudis2013, author = {Rauer, Miriam and Kaloudis, Michael}, title = {Hinter der Fassade - Ausfallanalyse an einem Lithium-Ionen Akkumulator mittels CT}, series = {QZ Qualit{\"a}t und Zuverl{\"a}ssigkeit}, volume = {2013}, journal = {QZ Qualit{\"a}t und Zuverl{\"a}ssigkeit}, number = {1}, pages = {40 -- 41}, year = {2013}, subject = {Lithium-Ionen-Akkumulator}, language = {de} } @inproceedings{SauerKeferRuppertetal.2019, author = {Sauer, Theresia and Kefer, Stefan and Ruppert, Wolfgang and Hellmann, Ralf and Kaloudis, Michael}, title = {Integration of Bragg grating sensors in components made of carbon fiber reinforced polymers}, series = {Tagungsband der 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019, 25.06.2019 - 26.06.2019, N{\"u}rnberg, Deutschland}, booktitle = {Tagungsband der 20. GMA/ITG-Fachtagung Sensoren und Messsysteme 2019, 25.06.2019 - 26.06.2019, N{\"u}rnberg, Deutschland}, isbn = {978-3-9819376-0-2}, doi = {10.5162/sensoren2019/P3.12}, pages = {806 -- 810}, year = {2019}, abstract = {This contribution discusses the integration of polymer planar Bragg grating sensors (PPBG) into carbon fiber reinforced polymer (CFRP) components. For the first time, it is shown that PPBGs based on cyclic olefin copolymers can be integrated into commercial-grade composites, thereby withstanding the demanding production processes. Pre-impregnated fibers are stacked and partially modified to form a sensor pocket. Afterwards, the CFRP specimen containing the optical sensor is cured in a heated mechanical press for 2 hours at a pressure of 7 bar and a temperature of 120 °C. A subsequent evalutaion of the sensor signal shows a Bragg wavelength shift of 1236 pm and a decline in signal amplitude of -2 dB. Three-point flexural tests of the cured sample reveal a linear behavior of the sensor signal towards external loads. The determined sensitivity in dependence of the CFRP specimen's maximum central deflection is -112 pm/mm, while correlation to the applied force results in a sensitivity of -5 pm/N.}, subject = {Bragg-Reflektor}, language = {en} } @article{BachmannAmrheinKaloudis2016, author = {Bachmann, Marco and Amrhein, Sebastian and Kaloudis, Michael}, title = {Intelligente Pedelecs f{\"o}rdern. Ein Ansatz zur nachhaltigen Verbesserung unseres Mobilit{\"a}tsverhaltens}, series = {Internationales Verkehrswesen}, volume = {2016}, journal = {Internationales Verkehrswesen}, number = {1}, pages = {16 -- 19}, year = {2016}, subject = {Pedelec}, language = {de} } @article{FuchsSchreckKaloudis2012, author = {Fuchs, Christopher and Schreck, Timo and Kaloudis, Michael}, title = {Interfacial reactions between Sn 57Bi 1Ag solder and electroless Ni-P/immersion Au under solid-state aging}, series = {Journal of Materials Science}, volume = {47}, journal = {Journal of Materials Science}, number = {9}, pages = {4036 -- 4041}, year = {2012}, subject = {Intermetallische Verbindungen}, language = {en} } @inproceedings{SchmittSchnepfFrankeetal.2019, author = {Schmitt, Wolfgang and Schnepf, Michael and Franke, J{\"o}rg and Kaloudis, Michael}, title = {Investigation of a Sintering Process for Micro-Scale Copper Material}, series = {2019 SMTA Electronic in Harsh Environments Conference}, volume = {2019}, booktitle = {2019 SMTA Electronic in Harsh Environments Conference}, year = {2019}, subject = {Kupfer}, language = {en} } @inproceedings{SchwarzerChewSchnepfetal.2018, author = {Schwarzer, Christian and Chew, Ly May and Schnepf, Michael and Stoll, Thomas and Franke, J{\"o}rg and Kaloudis, Michael}, title = {INVESTIGATION OF COPPER SINTER MATERIAL FOR DIE ATTACH}, series = {SMTA International Conference Proceedings}, volume = {2018}, booktitle = {SMTA International Conference Proceedings}, number = {Proceedings SMTAI 2018}, address = {Rosemont}, organization = {SMTA}, year = {2018}, subject = {Leistungshalbleiter}, language = {en} } @inproceedings{HenselRothMerzetal.2019, author = {Hensel, Alexander and Roth, Frederick and Merz, Corinna and Franke, J{\"o}rg and Kaloudis, Michael}, title = {Investigation of Pressureless Sintered Interconnections on Plasma Based Additive Copper Metallization for 3-Dimentional Ceramic Substrates in High Temperature Applications}, series = {22nd Microelectronics and Packaging Conference (EMPC) \& Exhibition, 16 Sep 2019 - 19 Sep 2019, Conference Center PISA, Italy}, booktitle = {22nd Microelectronics and Packaging Conference (EMPC) \& Exhibition, 16 Sep 2019 - 19 Sep 2019, Conference Center PISA, Italy}, year = {2019}, subject = {Sintern}, language = {en} } @inproceedings{HenselSchwarzerScheetzetal.2018, author = {Hensel, Alexander and Schwarzer, Christian and Scheetz, Matthias and Kaloudis, Michael and Franke, J{\"o}rg}, title = {Investigations of Silver Sintered Interconnections 3-Dimensional Ceramics with Plasma Based Additive Copper Metallizations}, series = {2018 IEEE 20th Electronics Packaging Technology Conference (EPTC)}, volume = {2018}, booktitle = {2018 IEEE 20th Electronics Packaging Technology Conference (EPTC)}, address = {Singapore}, doi = {10.1109/EPTC.2018.8654421}, pages = {416 -- 421}, year = {2018}, subject = {Leistungselektronik}, language = {en} } @article{BochtlerHellmannKaloudisetal.2010, author = {Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Amrhein, Frank and Glaab, Johannes and Kaloumenos, Mareiki and Sauer, Michael and Gockel, Tilo}, title = {LUVLED - UV-Leistungslichtquelle auf Leuchtdiodenbasis}, series = {Elektor Sonderheft, LEDs 2}, volume = {2011}, journal = {Elektor Sonderheft, LEDs 2}, number = {2}, publisher = {Elektor-Verlag}, address = {Aachen}, pages = {57 -- 63}, year = {2010}, subject = {Lumineszenzdiode}, language = {de} } @article{SchneiderBochtlerHellmannetal.2012, author = {Schneider, Johannes and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael and Gockel, Tilo}, title = {LUVLED III - Optimierung eines K{\"u}hlkonzeptes zur Aktivluftk{\"u}hlung eines Hochleistungs-UV-LED-Moduls}, series = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, journal = {Zeitschrift ELEKTOR, Sonderheft LED-Special 4 - Leuchtdioden in Theorie und Praxis, 2012}, number = {9}, pages = {20 -- 29}, year = {2012}, subject = {Lumineszenzdiode}, language = {de} } @article{FuchsSchreckKaloudis2011, author = {Fuchs, Christopher and Schreck, Timo and Kaloudis, Michael}, title = {Metallographische Untersuchungen an Sn-8Zn-3Bi-L{\"o}tverbindungen}, series = {PLUS}, volume = {13}, journal = {PLUS}, number = {10}, pages = {2378 -- 2384}, year = {2011}, subject = {L{\"o}tverbindung}, language = {de} } @article{KeferSauerHessleretal.2020, author = {Kefer, Stefan and Sauer, Theresia and Hessler, Steffen and Kaloudis, Michael and Hellmann, Ralf}, title = {Microstructure-Based Fiber-to-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications}, series = {Sensors (Basel)}, volume = {20}, journal = {Sensors (Basel)}, number = {19}, doi = {10.3390/s20195452}, pages = {5452 -- 5452}, year = {2020}, abstract = {This article proposes and demonstrates a robust microstructure-based fiber-to-chip coupling scheme for planar Bragg grating devices. A polymer planar Bragg grating substrate is manufactured and microstructured by means of a micromilling process, while the respective photonic structures are generated by employing a sophisticated single-writing UV-exposure method. A stripped standard single mode fiber is inserted into the microstructure, which is filled with a UV-curable adhesive, and aligned with the integrated waveguide. After curing, final sensor assembly and thermal treatment, the proposed coupling scheme is capable of withstanding pressures up to 10 bar, at room temperature, and pressures up to 7.5 bar at an elevated temperature of 120 °C. Additionally, the coupling scheme is exceedingly robust towards tensile forces, limited only by the tensile strength of the employed single mode fiber. Due to its outstanding robustness, the coupling scheme enables the application of planar Bragg grating devices in harsh environments. This fact is underlined by integrating a microstructure-coupled photonic device into the center of a commercial-grade carbon fiber-reinforced polymer specimen. After its integration, the polymer-based Bragg grating sensor still exhibits a reflection peak with a dynamic range of 24 dB, and can thus be employed for sensing purposes.}, language = {en} } @incollection{KeferRothKaloudisetal.2021, author = {Kefer, Stefan and Roth, Frederick and Kaloudis, Michael and Schmauss, Bernhard and Hellmann, Ralf}, title = {Monitoring of Composite Bicycle Components using Polymer Planar Bragg Gratings}, series = {SMSI 2021 - Sensors and Instrumentation}, booktitle = {SMSI 2021 - Sensors and Instrumentation}, publisher = {AMA Service GmbH}, address = {Wunstorf, Germany}, isbn = {978-3-9819376-4-0}, doi = {10.5162/SMSI2021/B9.2}, pages = {161 -- 162}, year = {2021}, abstract = {This study demonstrates mobile load monitoring of a composite bicycle component using an application- customized polymer planar Bragg grating sensor, evaluated by a mobile interrogation unit. After a referencing procedure, the mechanical load of a seat post is monitored while cycling through a test track.}, subject = {Bragg-Reflektor}, language = {en} } @article{AmrheinKehrerSchrecketal.2011, author = {Amrhein, Frank and Kehrer, Martin and Schreck, Timo and Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael}, title = {More efficient curing of UV sensitive mounting materials}, series = {Practical metallography}, volume = {48}, journal = {Practical metallography}, number = {7}, pages = {356 -- 364}, year = {2011}, subject = {Aush{\"a}rtung}, language = {en} } @article{BochtlerHellmannKaloudis2010, author = {Bochtler, Ulrich and Hellmann, Ralf and Kaloudis, Michael}, title = {Neuartige UV-Lichtquelle auf Leuchtdiodenbasis, Packaging und Hybridschaltungen}, series = {PLUS}, journal = {PLUS}, number = {2}, publisher = {Leuze-Verlag}, year = {2010}, subject = {Lumineszenzdiode}, language = {de} } @article{DresslerRauerKaloudisetal.2014, author = {Dressler, Katharina and Rauer, Miriam and Kaloudis, Michael and Dauwe, Stefan and Herguth, Axel and Hahn, Giso}, title = {Nondestructive Characterization of Voids in Rear Local Contacts of PERC-Type Solar Cells}, series = {IEEE Journal of Photovoltaics}, volume = {2015}, journal = {IEEE Journal of Photovoltaics}, number = {1}, doi = {10.1109/JPHOTOV.2014.2359745}, pages = {70 -- 76}, year = {2014}, abstract = {In this paper, we present two nondestructive characterization methods for the detection of voids in rear local contacts of passivated emitter and rear-type solar cells, namely scanning acoustic microscopy and computer tomography. We compare both methods and include a comparison with electroluminescence measurements. It is shown in this paper that voids can easily be detected with both measurement types without any sample preparation. We found a good match of scanning acoustic microscopy (SAM) and computer tomography (CT), which is presented for this purpose for the first time. The investigation was carried out for different aluminum pastes.}, subject = {Solarzelle}, language = {de} } @article{WohlschloegelKaloudis2011, author = {Wohlschl{\"o}gel, Timo and Kaloudis, Michael}, title = {Praktische Oberfl{\"a}chenanalytik - {\"U}berblick {\"u}ber die Verfahren EDX, AES, XPS und SIMS}, series = {Galvanotechnik}, journal = {Galvanotechnik}, number = {12}, pages = {2637 -- 2646}, year = {2011}, subject = {Oberfl{\"a}chenanalyse}, language = {de} } @article{KeferSauerHessleretal.2020, author = {Kefer, Stefan and Sauer, Theresia and Hessler, Steffen and Kaloudis, Michael and Schmauß, Bernhard and Hellmann, Ralf}, title = {Robust Polymer Planar Bragg Grating Sensors Embedded in Commercial-Grade Composites}, series = {Polymers}, volume = {12}, journal = {Polymers}, number = {3}, doi = {10.3390/polym12030715}, pages = {715 -- 715}, year = {2020}, abstract = {This contribution demonstrates the functionality of polymer planar Bragg grating (PPBG) sensors integrated into commercial-grade carbon fiber reinforced polymer (CFRP) components. Multiple CFRP specimens are generated by curing a stack of pre-impregnated fibers inside of a heated mechanical press, exposing the polymer sensor to a pressure of 7 bar and a temperature of 120 °C for 2 h. After integration, the sensor still exhibits a strong and evaluable signal. Subsequent flexural experiments reveal a linear response of the integrated sensor's Bragg wavelength to the CFRP specimen's maximum deflection. Additional findings demonstrate that the embedded PPBG can be used to detect plastic deformations of a CFRP workpiece, whereas a linear correlation of plastic deformation to the resulting Bragg signal offset is determined. A plausibility check of the obtained results is delivered by a comparison of three-point flexural experiments on bulk CFRP workpieces, without integrated sensors and additional specimens featuring external optical sensors affixed to their surface. It is found that PPBGs based on cyclic olefin copolymers are able to overcome the temperature-related limitations of traditional polymer-based optical sensors and can thus be directly integrated into commercial-grade composites during production.}, subject = {Bragg-Reflektor}, language = {en} }