TY - JOUR A1 - Maximilian, Rosilius A1 - Spiertz, Martin A1 - Wirsing, Benedikt A1 - Geuen, Manuel A1 - Bräutigam, Volker A1 - Ludwig, Bernd T1 - Impact of Industrial Noise on Speech Interaction Performance and User Acceptance when Using the MS HoloLens 2 JF - Multimodal Technologies and Interaction Y1 - 2024 U6 - https://doi.org/10.3390/mti8020008 VL - 8 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Machin, Graham A1 - Bloembergen, P. A1 - Anhalt, Klaus A1 - Sadli, M. A1 - Saunders, P. A1 - Woolliams, E. A1 - Yamada, Y. A1 - Yoon, H. T1 - Practical implementation of the mise-en-pratique for the definition of the Kelvin above the silver point JF - International Journal of Thermophysics Y1 - 2010 UR - http://permalink.bibkatalog.de/BV013298193 IS - 31 SP - 1779 EP - 1788 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Khlevnoy, B. A1 - Rougie, B. A1 - Gibson, C. A1 - Yoon, H. A1 - Gaertner, A. A1 - Taubert, Dieter Richard T1 - CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm JF - Metrologia Y1 - 2009 UR - http://permalink.bibkatalog.de/BV012573233 IS - 46 SP - 174 EP - 180 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Krenek, S. A1 - Anhalt, Klaus A1 - Lindemann, A. A1 - Hollandt, Jörg T1 - A study on the feasibility of measuring the emissivity with the laser-flash method JF - International Journal of Thermophysics Y1 - 2010 UR - http://permalink.bibkatalog.de/BV013298193 IS - 31 SP - 998 EP - 1010 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Lindner, D. A1 - Krüger, U. T1 - Camera based investigation of high-temperature fixed-points for radiometric application JF - Metrologia Y1 - 2009 UR - http://permalink.bibkatalog.de/BV012573233 IS - 46 SP - 260 EP - 265 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Ojanen, M. A1 - Anhalt, Klaus A1 - Schiller, S. A1 - Weckström, T. A1 - Kärhä, P. A1 - Heinonen, M. A1 - Ikonen, E. T1 - Comparison of the radiation temperature scales between MIKES and PTB JF - Measurement Y1 - 2010 IS - 43 SP - 183 EP - 189 ER - TY - JOUR A1 - Höfflin, Dennis A1 - Sauer, Christian A1 - Schiffler, Andreas A1 - Hartmann, Jürgen T1 - Process Monitoring Using Synchronized Path Infrared Thermography in PBF-LB/M JF - Sensors N2 - Additive manufacturing processes, particularly Laser-Based Powder Bed Fusion of Metals (PBF-LB/M), enable the development of new application possibilities due to their manufacturing-specific freedom of design. These new fields of application require a high degree of component quality, especially in safety-relevant areas. This is currently ensured primarily via a considerable amount of downstream quality control. Suitable process monitoring systems promise to reduce this effort drastically. This paper introduces a novel monitoring method in order to gain process-specific thermal information during the manufacturing process. The Synchronized Path Infrared Thermography (SPIT) method is based on two synchronized galvanometer scanners allowing high-speed and high-resolution observations of the melt pool in the SWIR range. One scanner is used to steer the laser over the building platform, while the second scanner guides the field of view of an IR camera. With this setup, the melting process is observed at different laser powers, scan speeds and at different locations with respect to the laser position, in order to demonstrate the positioning accuracy of the system and to initially gain thermal process data of the melt pool and the heat-affected zone. Therefore, the SPIT system shows a speed independent overall accuracy of ±2 Pixel within the evaluated range. The system further allows detailed thermal observation of the melt pool and the surrounding heat-affected zone. KW - SPIT KW - PBF-LB/M KW - additive manufacturing KW - process monitoring KW - SWIR KW - melt pool KW - galvanometer scanner Y1 - 2022 U6 - https://doi.org/10.3390/s22165943 VL - 22 IS - 16 PB - MDPI ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Werner, L. A1 - Fischer, J. A1 - Johannsen, U. T1 - Accurate determination of the spectral responsivity of silicon trap detectors between 238 nm and 1015 nm using a laser-based cryogenic radiometer JF - Metrologia Y1 - 2000 UR - http://permalink.bibkatalog.de/BV012573233 IS - 37 SP - 279 EP - 284 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. T1 - Measuring local thermal conductivity in polycrystalline diamond with a high resolution photothermal microscope JF - J. Appl. Phys. Y1 - 1997 UR - http://permalink.bibkatalog.de/BV013637659 IS - 81 SP - 2966 EP - 2977 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Fischer, J. A1 - Seidel, J. T1 - A non-contact technique providing improved accuracy in area measurements of radiometric apertures JF - Metrologia Y1 - 2000 UR - http://permalink.bibkatalog.de/BV012573233 IS - 37 SP - 637 EP - 640 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Calibration and interpolation of the spectral responsivity of silicon photodiode based detectors JF - Sensors & Actuators A: Physical Y1 - 2009 UR - http://permalink.bibkatalog.de/BV013197638 IS - 156 SP - 185 EP - 190 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Klotzbücher, T. A1 - Reichling, M. T1 - Local variation of room temperature thermal conductivity in high quality polycrystalline diamond JF - Appl. Phys. Lett. Y1 - 1998 IS - 73 SP - 756 EP - 758 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Costello, M. A1 - Reichling, M. T1 - The influence of thermal barriers on heat flow in high quality chemical vapour deposited diamond JF - Phys. Rev. Lett. Y1 - 1998 IS - 80 SP - 117 EP - 120 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Verhoeven, H. A1 - Reichling, M. A1 - Müller-Sebert, W. A1 - Zachai, R. T1 - Structural limitations to local thermal diffusivity of diamond films JF - Diamond and Related Materials Y1 - 1996 UR - http://permalink.bibkatalog.de/BV013364452 IS - 5 SP - 1012 EP - 1016 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Maznev, A.A. A1 - Reichling, M. T1 - Thermal wave propagation in thin films on substrates JF - J. Appl. Phys Y1 - 1995 UR - http://permalink.bibkatalog.de/BV013637659 IS - 78 SP - 5266 EP - 5269 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Langer, G. A1 - Reichling, M. T1 - Thermal conductivity of thin metallic films measured with the photothermal profile analysis JF - Rev. Sci. Instr. Y1 - 1997 IS - 68 SP - 1510 EP - 1513 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Reichling, M. A1 - Voigt, P. T1 - Quantitative thermal imaging of current densities and heat flow in electronic microstructures JF - Prog. in Nat. Sci. Y1 - 1996 IS - 6 SP - 519 EP - 523 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Reichling, M. A1 - Matthias, E. T1 - Thermoreflectance measurements of single thermal barriers in CVD-diamond JF - Prog. in Nat. Sci. Y1 - 1996 IS - 6 SP - 297 EP - 300 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. A1 - Matthias, E. T1 - Photothermal measurement of thermal anisotropy in pyrolytic graphite JF - Appl. Phys. B Y1 - 1996 IS - 62 SP - 493 EP - 497 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Voigt, P. A1 - Reichling, M. T1 - Thermal wave imaging of electrically heated microstructures JF - J. Appl. Phys. Y1 - 1996 IS - 80 SP - 2013 EP - 2018 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Nilsson, O. A1 - Fricke, J. T1 - Thermal diffusivity measurements on two-layered systems with the laser-flash method JF - High Temp. - High Press Y1 - 1993 IS - 25 SP - 403 EP - 410 ER - TY - JOUR A1 - Ochs, Dennis A1 - Wehnert, Kira-Kristin A1 - Hartmann, Jürgen A1 - Schiffler, Andreas A1 - Schmitt, Jan T1 - Sustainable Aspects of a Metal Printing Process Chain with Laser Powder Bed Fusion (LPBF) JF - Procedia CIRP N2 - Production companies are getting more and more aware of the relevancy of energy costs and the environmental impact of their manufactured products. Hence, the knowledge about the energy intensity of new process technologies as metal printing becomes increasingly crucial. Therefore, data about the energy intensity of entire process chains allow a detailed assessment of the life cycle costs and environmental impact of metal printed parts. As metal printing with Laser Powder Bed Fusion (LPBF) is applied from rapid prototyping to serial manufacturing processes more and more, sustainability data are useful to support a valid scale-up scenario and energetic improvements of the 3D-printing machinery as well as peripheral aggregates used in the process chain. The contribution aims to increase the transparency of the LPBF process chain in terms of its energy consumption. Therefore a generalized model to assess sustainability aspects of metal printed parts is derived. For this purpose, the LPBF process chain with the essential pre-, main- and post-processes is evaluated regarding its energy intensity. Here, the sub-processes, for example wet and dry cleaning of the printer, sieving of the metal powder or sand-blasting of the part are analyzed as well as the main printing process. Based on the derived experimental data from an installed, industry-like process chain, a model is created, which tends to generalize the experimental findings to evaluate other metal printed parts and process chain variants in terms of their energy intensity. Y1 - 2021 UR - 10.1016/j.procir.2021.01.163 VL - 98 SP - 613 EP - 618 PB - Elsevir ER - TY - JOUR A1 - Arndt, Bernhard A1 - Popov, Artem A1 - Sayenko, Yuriy T1 - Investigation of voltage transformers operating modes in networks with insulated neutral terminal at non-symmetric modes JF - FHWS science journal N2 - Ferroresonance and processes at one-phase grounding inside networks with insulated neutral terminal are investigated. It is shown that the mode with unidirectional arc, at which direct current passed in high voltage windings is the most difficult operating mode for the transformer. The influence of the secondary voltage transformer load upon the stability of ferroresonance oscillations has been also investigated. KW - Ferroresonance KW - Magnetization curve KW - One-phase arc grounding KW - voltage transormer KW - zero-sequence capacity Y1 - 2014 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-964 VL - 2 (2014) IS - 1 SP - 8 EP - 15 ER - TY - JOUR A1 - Kranz, Philipp A1 - Schirmer, Fabian A1 - Kaupp, Tobias A1 - Daun, Marian T1 - Generative AI Copilot to Support Safety Analyses of Human–Robot Collaborations: Hazard Operability Analysis and GPT-4 JF - IEEE Software Y1 - 2024 U6 - https://doi.org/10.1109/MS.2024.3414445 SN - 0740-7459 VL - 41 IS - 6 SP - 65 EP - 72 PB - Institute of Electrical and Electronics Engineers (IEEE) ER - TY - JOUR A1 - Küchler, Andreas A1 - Bellm, H. A1 - Herold, J. A1 - Schwab, A. T1 - Rogowski-Spulen und Magnetfeldsensoren zur Messung transienter Ströme im Nanosekundenbereich BT - Teil 1 JF - Archiv für Elektrotechnik Y1 - 1985 UR - http://permalink.bibkatalog.de/BV013241178 VL - 68 SP - 63 EP - 68 ER - TY - JOUR A1 - Küchler, Andreas A1 - Bellm, H. A1 - Herold, J. A1 - Schwab, A. T1 - Rogowski-Spulen und Magnetfeldsensoren zur Messung transienter Ströme im Nanosekundenbereich BT - Teil 2 JF - Archiv für Elektrotechnik Y1 - 1985 UR - http://permalink.bibkatalog.de/BV013241178 VL - 68 SP - 69 EP - 74 ER -