TY - JOUR A1 - Vetter, Mark T1 - Future alterations of thermal characteristics in a medium-sized lake simulated by coupling a regional climate model with a lake model JF - Climate Dynamics N2 - Regional climate models (RCM) provide site-specific meteorological data at a suitable spatial resolution for the estimation of future climate-driven changes in aquatic ecosystems. In this study, we used meteorological data from the RCM weather-situation-based regionalization method (WETTREG), available for Germany, to force a one-dimensional hydrodynamic lake model to simulate climate-induced changes on the summer thermal stratification of Lake Ammersee in southern Germany. In comparison to the period of 2002–2010, an extension by 22 days of the summer stratification period was simulated for 2042–2050. Further, a vertical shift in the position of metalimnion and thermocline within the lake was not detected, but a slight increase in the metalimnion thickness during mid-summer of 1 m was simulated. Along with these changes in stratification patterns, warming for the epilimnion water temperatures during summer stratification and for the entire water body in winter were simulated for the future. By contrast the hypolimnion temperatures are simulated to decrease during the summer stratification. In addition to simulating future limno-physical aspects, the investigation demonstrates that the RCM data of the WETTREG projection are suitable for conducting climate change impact studies. Y1 - 2015 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-20723 UR - https://doi.org/10.1007/s00382-014-2259-5 N1 - Accepted version des Artikels. Published source: Bueche, T., Vetter, M. Future alterations of thermal characteristics in a medium-sized lake simulated by coupling a regional climate model with a lake model. Clim Dyn 44, 371–384 (2015). https://doi.org/10.1007/s00382-014-2259-5 VL - 44 SP - 371 EP - 384 ER - TY - JOUR A1 - Vetter, Mark T1 - Simulating water temperatures and stratification of a pre-alpine lake with a hydrodynamic model BT - calibration and sensitivity analysis of climatic input parameters JF - Hydrological Processes N2 - We report on the calibration of the one-dimensional hydrodynamic lake model Dynamic Reservoir Simulation Model to simulate the water temperature conditions of the pre-alpine Lake Ammersee (southeast Germany) that is a representative of deep and large lakes in this region. Special focus is given to the calibration in order to reproduce the correct thermal distribution and stratification including the time of onset and duration of summer stratification. To ensure the application of the model to investigate the impact of climate change on lakes, an analysis of the model sensitivity under stepwise modification of meteorological input parameters (air temperature, wind speed, precipitation, global radiation, cloud cover, vapour pressure and tributary water temperature) was conducted. The total mean error of the calibration results is −0.23 °C, the root mean square error amounts to 1.012 °C. All characteristics of the annual stratification cycle were reproduced accurately by the model. Additionally, the simulated deviations for all applied modifications of the input parameters for the sensitivity analysis can be differentiated in the high temporal resolution of monthly values for each specific depth. The smallest applied alteration to each modified input parameter caused a maximum deviation in the simulation results of at least 0.26 °C. The most sensitive reactions of the model can be observed through modifications of the input parameters air temperature and wind speed. Hence, the results show that further investigations at Lake Ammersee, such as coupling the hydrodynamic model with chemo-dynamic models to assess the impact of changing climate on biochemical conditions within lakes, can be carried out using Dynamic Reservoir Simulation Model. Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-20702 UR - https://doi.org/10.1002/hyp.9687 N1 - Accepted version des Artikels. This is the peer reviewed version of the following article: Bueche, T. and Vetter, M. (2014), Simulating water temperatures and stratification of a pre-alpine lake with a hydrodynamic model: calibration and sensitivity analysis of climatic input parameters. Hydrol. Process., 28: 1450-1464, which has been published in final form at https://doi.org/10.1002/hyp.9687. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited. VL - 28 IS - 3 SP - 1450 EP - 1464 ER - TY - JOUR A1 - Vetter, Mark T1 - Using the General Lake Model (GLM) to simulate water temperatures and ice cover of a medium-sized lake BT - a case study of Lake Ammersee, Germany JF - Environmental Earth Sciences N2 - Thermal dynamics of lakes has a key role in chemical and biological processes in lakes including nutrient distributions and phytoplankton growth. Applications of hydrodynamic models to lakes can provide insights into possible future alterations in thermal dynamics induced by climate change. In this study we present the calibration and validation of the newest version of the open-source hydrodynamic model GLM (General Lake Model) to the dimictic Lake Ammersee, located in south-east Germany. The simulation of lake water temperatures for the calibration period revealed an overall root mean square error of 0.65 °C and a mean error of 0.08 °C. The seasonal stratification pattern and the annual thermal structure of this dimictic lake were reproduced by the model. The model simulated the presence of winter ice cover for the only year out of eight years simulated, when ice cover was observed. Elevated lake water temperatures were also reproduced in model simulations during a period in 2003 of unusually high air temperatures. Statistical analysis of the model calibration results for Lake Ammersee indicates a fit comparable to, or better than most other well-established hydrodynamic models and provides an opportunity for continuous simulations through periods of ice cover. Our results indicate a major improvement of GLM compared with earlier model versions and demonstrate the applicability of GLM for limnophysical studies, particularly for altered forcing conditions such as climate change. Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-20710 UR - https://doi.org/10.1007/s12665-017-6790-7 N1 - Accepted version des Artikels. Published source: Bueche, T., Hamilton, D.P. & Vetter, M. Using the General Lake Model (GLM) to simulate water temperatures and ice cover of a medium-sized lake: a case study of Lake Ammersee, Germany. Environ Earth Sci 76, 461 (2017). https://doi.org/10.1007/s12665-017-6790-7 VL - 76 ER - TY - GEN A1 - Hartmann, Jürgen A1 - Fischer, J. A1 - Seidel, J. T1 - Improved accuracy in measurement of radiometric apertures with a non-contact technique BT - Newrad’99 (Poster) Y1 - 1999 CY - Madrid (Spanien) ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Radiometrie im UV und IR BT - future led Seminar „UV-IRED LED Seminar“ Y1 - 2009 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Photometrie und Radiometrie BT - 125 Jahre Lichttechnik an der TU Berlin Y1 - 2007 CY - Berlin ER - TY - RPRT A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Fischer, Joachim T1 - Measurements of T-T90 down to Zinc point temperatures with absolute filter radiometry BT - Arbeitsbericht des Konsultativ Commitee für Thermometrie des BIPM, CCT/01-03 Y1 - 2001 CY - Paris (Frankreich) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Comparison and Evaluation of Different Models for the Interpolation of Spectral Responsivity Data T2 - Proceedings of NEWRAD Y1 - 2008 SP - 309 EP - 310 ER - TY - BOOK A1 - Hartmann, Jürgen T1 - Quantitative Bestimmung lokaler thermischer Eigenschaften in polykristallinem Diamant Y1 - 1996 PB - Köster CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Legal metrology on clinical thermometers in the European Union BT - Seminar der Japan Measuring Instruments Federation Y1 - 2004 CY - Tokyo (Japan) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Gutschwager, B. A1 - Fischer, Joachim A1 - Hollandt, Jörg T1 - Calibration of thermal cameras for temperature measurements using blackbody radiation in the temperature range –60 °C up to 3000 °C T2 - IRS² 2002 Y1 - 2002 CY - Erfurt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Hollandt, Jörg T1 - Nearly as hot as the sun: High-temperature fixed-points for radiation thermometry and radiometry BT - NCSLI Symposium Metrology’s Impact on Products and Services Y1 - 2007 CY - St. Paul (USA) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Gutschwager, B. A1 - Fischer, Joachim A1 - Hollandt, Jörg T1 - Calibration of thermal cameras for temperature measurements using blackbody radiation in the temperature range -60°C up to 3000 °C BT - AMA Service GmbH T2 - Proceedings of the International Conference Infrared Sensors & Systems Y1 - 2002 SP - 119 EP - 124 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Gutschwager, B. A1 - Hollandt, Jörg T1 - A novel lens-free high-accuracy InGaAs radiation thermometer for radiation temperatures above 300 °C T2 - VDI-Bericht 1784 Y1 - 2003 SP - 155 EP - 162 ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Modernste Radiometrie und Photometrie BT - WTT Seminar „Beleuchtung mit LEDs“ Y1 - 2008 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Monte, C. A1 - Gutschwager, B. A1 - Baltruschat, C. A1 - Hollandt, Jörg A1 - Kochems, D. A1 - Küchel, C. T1 - The Spectral Photon Flux of the Radiometric Calibration Spectral Source for the NIRSpec Instrument of the James Webb Space Telescope T2 - Proceedings of NEWRAD Y1 - 2008 SP - 79 EP - 80 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - Microscopic heat transfer in high quality polycrystalline diamond BT - EAA Symposium on Molecular and Quantum Acoustics Y1 - 1997 CY - Ustron (Polen) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Khlevnoy, B. A1 - Rougie, B. A1 - Gibson, C. A1 - Yoon, H. A1 - Gärtner, A. A1 - Taubert, Dieter Richard T1 - CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm T2 - Proceedings of NEWRAD Y1 - 2008 SP - 241 EP - 242 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - Wärmetransport in Kristalliten von CVD-Diamantschichten BT - Verhandlungen der DPG T2 - Frühjahrstagung der Deutschen Physikalischen Gesellschaft Y1 - 1997 IS - 5 SP - 616 EP - 616 CY - Münster ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard T1 - Assessing blackbody emissivity by Monte Carlo Simulation BT - IRS² 2002 Y1 - 2002 CY - Erfurt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Sakuma, F. A1 - Ma, L. T1 - Intercomparison of radiation temperatures scales between PTB and NMIJ from 1000 °C and 2500 °C T2 - Proceedings of SICE 2002 Y1 - 2002 SP - 111 EP - 115 ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Radiation thermometry at PTB BT - Seminar der Japan Measuring Instruments Federation Y1 - 2004 CY - Tokyo (Japan) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - Complete Characterisation of local thermal heat transfer in high quality chemical vapour deposited diamond BT - 10th International conference on Photothermal and Photoacoustic Phenomena Y1 - 1998 CY - Rom (Italien) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - McEvoy, H.C. A1 - Machin, Graham A1 - Friedrich, R. A1 - Hollandt, Jörg T1 - Comparison of the new NPL primary standard Ag fixed-point blackbody source with the primary standard fixed-point of PTB BT - Temperature 2002 Y1 - 2002 CY - Chicago (USA) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Völker, S. T1 - Thermal Management an Lichtquellen BT - Temperatur 2009 Y1 - 2009 CY - Berlin ER - TY - GEN A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - Quantitative photothermal measurement of thermal barriers in CVD-Diamond BT - Diamond ´97 (Poster) Y1 - 1997 CY - Edinburgh (Schottland) ER - TY - CHAP A1 - Hartmann, Jürgen T1 - Photothermal microscopy on CVD-diamond BT - Workshop´95 Photoacoustics and Photothermics Y1 - 1995 CY - Ebernburg ER - TY - CHAP A1 - Manara, Jochen A1 - Hartmann, Jürgen A1 - Rydzek, M. A1 - Stark, Thomas A1 - Arduini-Schuster, Mariacarla A1 - Ebert, Hans-Peter T1 - Bestimmung des Emissionsgrades und Transmissionsgrades keramischer Materialien bei hohen Temperaturen BT - Temperatur 2013 Y1 - 2013 SN - 3-9810021-8-0 SP - 219 EP - 224 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Lenhart-Rydzek, M. A1 - Stark, Thomas A1 - Arduini-Schuster, Mariacarla A1 - Manara, Jochen T1 - Enhanced measuring technique to determine the angle dependent surface emittance from 200 °C up to 1600 °C BT - Tempmeko 2013 Y1 - 2013 CY - Funchal (Portugal) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Ebert, Hans-Peter A1 - Lenhart-Rydzek, M. A1 - Tutschke, Andreas A1 - Hallam, Andrew T1 - LWIR pyrometry for the measurement of thermal barrier coatings within the EU project STARGATE BT - Tempmeko 2013 Y1 - 2013 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Mehling, H. T1 - The role of the index of refraction in the generation and propagation of blackbody radiation BT - Tempemko 2013 Y1 - 2013 CY - Funchal (Portugal) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Zänglein, Marc A1 - Seubert, R. T1 - Development of a Calliper to determine thermal conductivity BT - Science in Practice 2017 Y1 - 2017 CY - Pécs (Ungarn) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Monte, C. A1 - Gutschwager, B. A1 - Hollandt, Jörg T1 - Traceable Calibration of Radiation Sources from the Visible to the Far Infrared for Space Borne Applications at PTB BT - SPIE Konferenz Remote Sensing Y1 - 2009 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Machin, Graham A1 - Bloembergen, P. A1 - Sadli, M. A1 - Yamada, Y. T1 - A concerted international project to establish hig-temperature fixed-points for primary thermometry BT - Tempmeko 2007 Y1 - 2007 CY - Banf (Kanada) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Stark, Thomas A1 - Zipf, Matthias A1 - Arduini, Mariacarla A1 - Ebert, Hans-Peter A1 - Tutschke, Andreas A1 - Hallam, Andrew A1 - Hanspal, Jagdevinder A1 - Langley, Mark T1 - Entwicklung und Test eines langwelligen Strahlungsthermometers zur berührungslosen Temperaturmessung in Gasturbinen während des Betriebs BT - Temperatur 2017 Y1 - 2017 SN - 978-3-944659-04-6 SP - 43 EP - 48 CY - Berlin ER - TY - GEN A1 - Hartmann, Jürgen A1 - Knopp, Kevin A1 - Zänglein, Marc A1 - Manara, Jochen A1 - Stark, Thomas A1 - Zipf, Matthias A1 - Schreiber, Ekkehard A1 - Krüger, U. A1 - Brunner, Martin A1 - Müller, Michael T1 - Messsystem für dynamische Materialuntersuchung bei hohen Temperaturen BT - Sensoren und Messsysteme 2018 (Poster) Y1 - 2018 CY - Nürnberg ER - TY - GEN A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Friedrich, R. A1 - Hollandt, Jörg T1 - Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB BT - Newrad 2002 (Poster) Y1 - 2002 CY - Gaithersburg (USA) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Zänglein, Marc A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Ochs, Dennis A1 - Arduini, Mariacarla A1 - Hemberger, Frank A1 - Vidi, Stephan A1 - Manara, Jochen T1 - Experimentierplattform für dynamische Materialuntersuchung BT - Temperatur 2020 Y1 - 2020 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Gutschwager, B. A1 - Hollandt, Jörg T1 - PTB Activities in the Field of Testing and Calibration of Clinical IR Ear Thermometers BT - IRS² 2004 Y1 - 2004 CY - Nürnberg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Zipf, Matthias A1 - Stark, Thomas A1 - Arduini, Mariacarla A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Ochs, Dennis A1 - Zänglein, Marc A1 - Schreiber, Ekkehard A1 - Schmidt, Franz T1 - Experimental set-up for dynamic material investigation at high-temperatures for power engineering and additive manufacturing BT - 44. Freiburger Infrarot Kolloquium Y1 - 2019 CY - Freiburg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Nilsson, O. A1 - Fricke, J. T1 - Thermal diffusivity measurements on two-layered systems with the laser-flash method BT - 13th European Conference on Thermophysical Properties Y1 - 1993 CY - Lissabon (Portugal) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Ochs, Dennis A1 - Zänglein, Marc A1 - Stark, Thomas A1 - Zipf, Matthias A1 - Arduini, Mariacarla A1 - Hemberger, Frank A1 - Vidi, Stephan A1 - Manara, Jochen A1 - Müller, Michael A1 - Möller, F. T1 - Systematische thermophysikalische Charakterisierung von Wärmedämmschichten BT - Sensoren und Messsysteme 2019 Y1 - 2019 CY - Nürnberg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Ochs, Dennis A1 - Zänglein, Marc A1 - Arduini, Mariacarla A1 - Hemberger, Frank A1 - Vidi, Stephan A1 - Manara, Jochen A1 - Müller, Michael A1 - Möller, F. T1 - Thermophysikalische Charakterisierung von Wärmedämmschichten BT - Temperatur 2020 Y1 - 2020 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Völker, S. T1 - Thermisches Management von Lichtquellen BT - Sensoren und Messsysteme 2010 Y1 - 2010 CY - Nürnberg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - Der Einfluß von Korngrenzen auf die thermische Leitfähigkeit von CVD-Diamantschichten BT - Verhandlungen der DPG T2 - Frühjahrstagung der Deutschen Physikalischen Gesellschaft Y1 - 1997 IS - 5 SP - 6 EP - 6 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Calibration and interpolation of the spectral responsivity of silicon photodiode based detectors BT - Eurosensors 2008 Y1 - 2008 CY - Dresden ER - TY - GEN A1 - Hartmann, Jürgen A1 - Reichling, M. T1 - A new insight into local heat transfer in polycrystalline diamond BT - Diamond ´97 (Poster) Y1 - 1997 CY - Edinburgh (Schottland) ER - TY - CHAP 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 BT - Newrad’99 Y1 - 1999 CY - Madrid (Spanien) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Monte, C. A1 - Baltruschat, C. A1 - Gutschwager, B. A1 - Hollandt, Jörg A1 - Kochems, D. A1 - Küchel, C. A1 - te Plate, M. T1 - Radiometric calibration of the NIRSpec instrument on the James Webb Space Telescope in the wavelength range from 0.7 µm to 5.0 µm BT - IRS² 2009 Y1 - 2009 UR - https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=a3bb797fd2e46dfe0b642a9a63dfac14a34b4d7c CY - Nürnberg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Seubert, R. A1 - Zänglein, Marc T1 - Development of a Calliper to determine thermal conductivity BT - Science in Practice 2017 Y1 - 2017 SN - 978-963-429-131-2 SP - 21 EP - 27 ER - TY - CHAP A1 - Hartmann, Jürgen T1 - New developments in high-temperature measurement techniques BT - Science in Practice 2014 Y1 - 2014 CY - Osijek (Kroatien) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Machin, Graham A1 - Beynon, G. A1 - Fourrez, S. A1 - Lowe, D. A1 - Morice, R. A1 - Sadli, M. A1 - Villamanan, M. T1 - HIMERT: A pan-European project for development of metal-carbon eutectics as temperature standards BT - Temperature 2002 Y1 - 2002 CY - Chicago (USA) ER - TY - JOUR A1 - Jürgen, Hartmann A1 - Arduini, Mariacarla A1 - Manara, Jochen A1 - Stark, Thomas A1 - Ebert, Hans-Peter T1 - Development and Evaluation of an Improved Apparatus for Measuring the Emissivity at High Temperatures JF - Sensors N2 - An improved apparatus for measuring the spectral directional emissivity in the wavelength range between 1 µm and 20 µm at temperatures up to 2400 K is presented in this paper. As a heating unit an inductor is used to warm up the specimen, as well as the blackbody reference to the specified temperatures. The heating unit is placed in a double-walled vacuum vessel. A defined temperature, as well as a homogenous temperature distribution of the whole surrounding is ensured by a heat transfer fluid flowing through the gap of the double-walled vessel. Additionally, the surrounding is coated with a high-emitting paint and serves as blackbody-like surrounding to ensure defined boundary conditions. For measuring the spectral directional emissivity at different emission angles, a movable mirror is installed in front of the specimen, which can be adjusted by a rotatable arrangement guiding the emitted radiation into the attached FTIR-spectrometer. The setup of the emissivity measurement apparatus (EMMA) and the measurement procedure are introduced, and the derived measurement results are presented. For evaluating the apparatus, measurements were performed on different materials. The determined emissivities agree well with values published in literature within the derived relative uncertainties below 4% for most wavelengths. KW - emissivity KW - reflectivity KW - infrared radiation KW - high temperature KW - Temperatur KW - Emissivität Y1 - 2021 UR - https://www.mdpi.com/1424-8220/21/18/6252 U6 - https://doi.org/10.3390/s21186252 SN - 1424-8220 VL - 21 IS - 18 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. ED - Nazaré, H. ED - Neves, A.J. T1 - Thermal characterization of diamond materials T2 - Properties and growth of diamond Y1 - 2001 UR - https://books.google.de/books?id=jtC1mUFZfQcC&printsec=frontcover PB - Institution of Electrical Engineers CY - London ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Manara, Jochen A1 - Zipf, Matthias A1 - Stark, Thomas A1 - Arduini, Mariacarla A1 - Ebert, Hans-Peter A1 - Tutschke, Andreas A1 - Hallam, Andrew A1 - Hanspal, Jagdevinder A1 - Langley, Mark A1 - Hodge, D. T1 - Development of Long Wavelength Infrared Radiation Thermometry for Measurements in Gas Turbines BT - Key Note Lecture MSE 2016 Y1 - 2016 CY - Darmstadt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Knopp, Kevin A1 - Lenski, Philipp A1 - Zänglein, Marc A1 - Manara, Jochen A1 - Stark, Thomas A1 - Zipf, Matthias A1 - Arduini, Mariacarla A1 - Schreiber, Ekkehard A1 - Krüger, U. A1 - Schmidt, Franz A1 - Brunner, Martin T1 - Sensor systems for additive manufacturing Y1 - 2018 PB - Key Note Lecture MSE 2018 CY - Darmstadt ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Anhalt, Klaus A1 - Hollandt, Jörg A1 - Taubert, Dieter Richard A1 - Werner, L. T1 - Optische Hochtemperaturmesstechnik für die Thermometrie, Radiometrie und Photometrie BT - Sensoren und Messsysteme 2010 Y1 - 2010 CY - Nürnberg ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, D. A1 - Hollandt, Jörg A1 - Fischer, J. T1 - Investigation of the accuracy of the ITS-90 with reference to thermodynamic temperature in the range from 400 °C to 600 °C BT - Temperature 2002 Y1 - 2002 CY - Chicago (USA) ER - TY - GEN A1 - Hartmann, Jürgen A1 - Edler, F. T1 - Simultaneous contact and non-contact measurements of the melting temperature of a N-C fixed-point cell BT - Tempmeko 2007 (Poster) Y1 - 2007 CY - Banf (Kanada) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Tegeler, E. T1 - Activities in the field of legal metrology and standardisation of clinical thermometers BT - Tempmeko 2004 Y1 - 2004 CY - Dubrovnik (Kroatien) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Werner, L. T1 - Radiation thermometry towards the triple point of water? BT - Tempmeko 2007 Y1 - 2007 CY - Banf (Kanada) ER - TY - JOUR A1 - Gielinger, Sebastian A1 - Bohn, Gunther A1 - Deinzer, Frank A1 - Linke, Andreas T1 - Investigation of an inline inspection method for the examination of cylinder-like specular surfaces using deflectometry JF - applied sciences N2 - An optical measuring method is presented, with which it is possible to measure and evaluate reflective cylindrical surfaces using a combination of deflectometry and subsequent reconstruction of the surface. The system is set up and tested on rolling elements of cylindrical roller bearings. However, it is not limited to this use case and can be applied to other cylindrical specular surfaces. The system distinguishes itself from existing test methods through the combination of high-resolution three-dimensional defect measurement with a very short recording time, and offers the possibility of introducing tolerance limits in the production of cylindrical specular surfaces. With this method, it is possible to record a defect with the dimensions of 1.3 mm by 1.8 mm within 5 s and to reconstruct the absolute depth. The resolution of the system is below 10 μm in both X- and Y-direction, and is therefore sufficiently accurate to detect typical surface defects such as scratches, dents, or deformations. To validate the measured values of the system, the results of an artificially generated 10.35 μm deep defect location were compared with those of a highly accurate mechanical stylus measurement. KW - automated optical inspection KW - roller bearing KW - line scan camera Y1 - 2023 UR - https://doi.org/10.3390/app12136449 SN - 2076-3417 VL - 12 IS - 13 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Bloembergen, P. A1 - Sasajima, N. A1 - Yamada, Y. T1 - Comparing alternative schemes for realizing the high-temperature part of a future ITS-20XX with the aid of metal-carbon eutectic fixed points BT - Temperature 2002 Y1 - 2002 CY - Chicago (USA) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. A1 - Matthias, E. T1 - Thermoreflectance measurements of single thermal barriers in CVD-Diamond BT - 9th International conference on Photothermal and Photoacoustic Phenomena Y1 - CY - Nanjing (China) ER - TY - CHAP A1 - Gutschwager, B. A1 - Schiller, S. A1 - Hartmann, Jürgen A1 - Hollandt, K. ED - Zvizdic, D. T1 - A lens-free InGaAs transfer radiation thermometer with an extended calibration range above 960 °C BT - LPM/FSB T2 - Proceedings of Tempmeko 2004 Y1 - 2005 SP - 605 EP - 610 CY - Zagrep ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Friedrich, R. A1 - Sperfeld, P. A1 - Hollandt, Jörg ED - Zvizdic, D. T1 - Long-Term Stability of the Spectral Responsivity of Filter Radiometers at the PTB BT - LPM/FSB T2 - Proceedings of Tempmeko 2004 Y1 - 2005 SP - 977 EP - 982 CY - Zagrep ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Taubert, Dieter Richard A1 - Fischer, Joachim ED - Fellmuth, B. ED - Seidel, J. ED - Scholze, G. T1 - Measurements of T-T90 down to Zinc point temperatures with absolute filter radiometry T2 - Proceedings of Tempmeko 2001 Y1 - 2002 SP - 377 EP - 382 PB - VDI Verlag CY - Berlin ER - TY - CHAP A1 - Edler, F. A1 - Gorgieva, M. A1 - Hartmann, Jürgen A1 - Wagner, M. ED - Fellmuth, B. ED - Seidel, J. ED - Scholze, G. T1 - Comparison of different methods for the determination of undisturbed surface temperature T2 - Proceedings of Tempmeko 2001 Y1 - 2002 SP - 1105 EP - 1110 PB - VDI Verlag CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Reichling, M. ED - Scudieri, F. ED - Bertolotti, M. T1 - Complete characterisation of thermal heat transfer in high quality chemical vapour deposited diamond BT - AIP Conference Proceedings 463 T2 - Photoacoustic and Photothermal Phenomena Y1 - 1999 SP - 295 EP - 299 CY - Woodbury (New York) ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Ishii, J. A1 - Fukuzaki, T. A1 - McEvoy, H.C. A1 - Simpson, R. A1 - Machin, Graham A1 - Gutschwager, B. A1 - Hollandt, Jörg ED - Zvizdic, D. T1 - A comparison of the blackbody cavities for infrared ear thermometers of NMIJ, NPL, and PTB BT - LPM/FSB T2 - Proceedings of Tempmeko 2004 Y1 - 2005 SP - 1093 EP - 1098 CY - Zagrep ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Thomas, R. A1 - Ma, C.K. A1 - Steel, A. A1 - Hill, K. ED - Zvizdic, D. T1 - Bilateral comparison of the local realizations of the ITS-90 between the Silver point and 1700 °C using vacuum Tungsten-strip lamps as transfer standards between NRC and PTB BT - LPM/FSB T2 - Proceedings of Tempmeko 2004 Y1 - 2005 SP - 1069 EP - 1073 CY - Zagrep ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Roth, U. A1 - Moritz, W. A1 - Reichling, M. ED - Scudieri, F. ED - Bertolotti, M. T1 - Optimised strategies for thermal re-activation of LaF3/Pt-sensors based on photothermal characterisation BT - AIP Conference Proceedings 463 T2 - Photoacoustic and Photothermal Phenomena Y1 - 1999 SP - 398 EP - 400 CY - Woodbury (New York) ER - TY - CHAP A1 - Harrer, S. A1 - Dotterweich, C. A1 - Hartmann, Jürgen A1 - Zink, M. A1 - Schnitzler, Tim A1 - Ebert, Hans-Peter A1 - Hemberger, Frank T1 - Paraffine als Phasenwechselmaterialen in der elektrischen Isolierung von Hochspannungsbauteilen BT - ETG-Fachbericht-VDE-Hochspannungstechnik Y1 - 2016 ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Harrer, S. A1 - Dotterweich, C. A1 - Zink, Markus H. T1 - On the conduction process of dielectric liquids based on mineral oil BT - International Symposium on High Voltage Engineering 2017 Y1 - 2017 CY - Buenos Aires (Argentinien) ER - TY - JOUR A1 - Wehnert, Kira-Kristin A1 - Ochs, Dennis A1 - Schmitt, Jan A1 - Hartmann, Jürgen A1 - Schiffler, Andreas T1 - Reducing Lifecycle Costs due to Profile Scanning of the Powder Bed in Metal Printing JF - Procedia CIRP 98 N2 - First time right is one major goal in powder based 3D metal printing. Reaching this goal is driven by reducing life cycle costs for quality measures, to minimize scrap rate and to increase productivity under optimal resource efficiency. Therefore, monitoring the state of the powder bed for each printed layer is state of the art in selective laser melting. In the most modern approaches the quality monitoring is done by computer vision systems working with an interference on trained neural networks with images taken after exposure and after recoating. There are two drawbacks of this monitoring method: First, the sensor signals - the image of the powder bed - give no direct height information. Second, the application of this method needs to be trained and labeled with reference images for several cases. The novel approach presented in this paper uses a laser line scanner attached to the recoating machine. With this new concept, a direct threshold measure can be applied during the recoating process to detect deviations in height level without prior knowledge. The evaluation can be done online during recoating and feedback to the controller to monitor each individual layer. Hence, in case of deviations the location in the printing plane is an inherent measurement and will be used to decide which severity of error is reported. The signal is used to control the process, either by starting the recoating process again or stopping the printing process. With this approach, the sources of error for each layer can be evaluated with deep information to evaluate the cause of the error. This allows a reduction of failure in the future, which saves material costs, reduces running time of the machine life cycle phase in serial production and results in less rework for manufactured parts. Also a shorter throughput time per print job results, which means that the employee can spent more time to other print jobs and making efficient use of the employee’s work force. In summary, this novel approach will not only reduce material costs but also operating costs and thus optimize the entire life cycle cost structure. The paper presents a first feasibility and application of the described approach for test workpieces in comparison to conventional monitoring systems on an EOS M290 machine. Y1 - 2021 UR - 10.1016/j.procir.2021.01.175 VL - 98 SP - 684 EP - 689 PB - Elsevir ER - TY - JOUR A1 - Knopp, Kevin A1 - Shandy, Amir A1 - Manara, Jochen A1 - Vidi, Stephan A1 - Hartmann, Jürgen T1 - Metrologische Apparaturen zur Messung thermophysikalischer Materialeigenschaften bei sehr hohen Temperaturen im EU-Projekt Hi-TRACE JF - FHWS Science Journal N2 - Industriezweige wie die Glas-Industrie, die Kraftwerkstechnik sowie die Luft- und Raumfahrttechnik müssen kontinuierlich neue Methoden entwickeln, sowie bestehende Verfahren optimieren, um in ihren Bereichen wettbewerbsfähig zu sein bzw. neue Anforderungen an Umwelt- und Klimaschutz zu erfüllen. Dies beinhaltet oft die Entwicklung neuer Materialien, die leichter zu fabrizieren sind und sowohl mechanisch als auch thermisch höheren Belastungen standhalten. Für die genannten Industriezweige sind Prozesse mit hohen Betriebstemperaturen bis zu 3.000 °C kennzeichnend und damit ist die Kenntnis von Materialeigenschaften bei diesen extremen Temperaturen von großer Bedeutung. Auch wenn es bereits einige Messapparaturen für die Bestimmung von thermophysikalischen Materialdaten bei hohen Temperaturen gibt, muss die Rückführung dieser auf die SI Basiseinheiten gewährleistet werden, um die Zuverlässigkeit der gemessenen Daten für die Anforderung der genannten Branchen sicherzustellen. Diese Aufgabe ist das Ziel des EMPIR-(European Metrology Programme for Innovation and Research) Projektes Hi-TRACE [1]. Hi-TRACE zielt darauf ab, Referenzapparaturen und neue Methoden für die Messung von thermophysikalischen Materialeigenschaften, (thermische Diffusivität, spezifische Wärme, Emissionsgrad und Schmelztemperatur) sowie der Haftung von Schichten über 1.000 °C zu bestimmen. KW - thermophysik KW - temperatur Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-20046 UR - https://nbn-resolving.org/urn:nbn:de:bvb:863-opus-19389 SN - 2196-6095 VL - 5 IS - 2 SP - 83 EP - 92 ER - TY - JOUR A1 - Ochs, Dennis A1 - Wehnert, Kira-Kristin A1 - Knopp, Kevin A1 - Hartmann, Jürgen A1 - Versch, Alexander A1 - Schiffler, Andreas T1 - Untersuchungen zur Temperaturleitfähigkeit additiv gefertigter Stahlproben in Abhängigkeit der relativen Dichte JF - FHWS Science Journal N2 - Das direkte Metall-Laser-Schmelzen (DMLS) aus der Familie der Additiven Fertigungsverfahren (AM) ermöglicht die schichtweise Erzeugung komplexer dreidimensionaler Geometrien mit hoher relativer Dichte unter Verwendung von Metallpulver als Ausgangsmaterial [1]. Die Technologie wird zunehmend eingesetzt, um innovative Bauteile material- und gewichtssparend herzustellen oder komplexe Produkte ohne zusätzliche Werkzeuge oder Spannvorrichtungen zu fertigen. Darüber hinaus sind Funktionsintegrationen, zum Beispiel Gussformen mit eingeprägten Kühlkanälen, möglich. Da einzelne Metallpulverschichten auf vorhergehende Schichten aufgeschmolzen werden, entstehen während der Herstellung des Bauteils komplexe, zeitabhängige Temperaturprofile [2]. Durch den Einsatz hoher Laserintensitäten und Scangeschwindigkeiten, bei denen die Belichtungszeit der Laserbestrahlung im Bereich von Millisekunden liegt, werden zudem extrem hohe Aufheiz- und Abkühlraten induziert, die zu einzigartigen Mikrostrukturen und Materialeigenschaften führen [3]. Diese extremen Prozessbedingungen können sich jedoch auch negativ auf den Fertigungsprozess auswirken. Bei komplexen Bauteilen bleibt die Prozessstabilität und Qualitätssicherung Umfragen zufolge weiterhin die wichtigste technologische Barriere für den Einsatz additiv gefertigter Bauteile in hochbelasteten oder sicherheitsrelevanten Bereichen [4]. Daher verspricht der Zusammenhang zwischen Temperaturprofil während der Fertigung, relativer Dichte der Bauteile, sowie thermophysikalischer Eigenschaften additiv gefertigter Proben wichtige Erkenntnisse, insbesondere im Hinblick auf eine zerstörungsfreie Qualitätssicherung, sowie neue Anwendungsmöglichkeiten. KW - temperatur KW - additive fertigung Y1 - 2022 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-19986 UR - https://nbn-resolving.org/urn:nbn:de:bvb:863-opus-19389 SN - 2196-6095 VL - 5 IS - 2 SP - 75 EP - 82 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 - CHAP A1 - Hartmann, Jürgen A1 - Lenski, Philipp A1 - Ochs, Dennis A1 - Shandy, Amir A1 - Winterstein, A. A1 - Versch, Alexander A1 - Schiffler, Andreas T1 - Thermische Prozessüberwachung für additive Fertigungsverfahren BT - Temperatur 2020 Y1 - 2020 CY - Berlin ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Ochs, Dennis A1 - Lenski, Philipp A1 - Schiffler, Andreas A1 - Versch, Alexander A1 - Manara, Jochen T1 - Thermal process monitoring for additive manufacturing BT - MSE 2020 Y1 - 2020 CY - Darmstadt ER -