@inproceedings{HartmannTaubertMonteetal., author = {Hartmann, J{\"u}rgen and Taubert, Dieter Richard and Monte, C. and Gutschwager, B. and Hollandt, J{\"o}rg}, title = {Traceable Calibration of Radiation Sources from the Visible to the Far Infrared for Space Borne Applications at PTB}, address = {Berlin}, language = {en} } @inproceedings{HartmannKrenekAnhaltetal., author = {Hartmann, J{\"u}rgen and Krenek, S. and Anhalt, Klaus and Lindemann, A. and Monte, C. and Hollandt, J{\"o}rg}, title = {A study on the feasibility of measuring the emissivity with the laser-flash method}, address = {Boulder (USA)}, language = {en} } @inproceedings{HartmannWerner, author = {Hartmann, J{\"u}rgen and Werner, L.}, title = {Calibration and interpolation of the spectral responsivity of silicon photodiode based detectors}, address = {Dresden}, language = {en} } @misc{HartmannEdler, author = {Hartmann, J{\"u}rgen and Edler, F.}, title = {Simultaneous contact and non-contact measurements of the melting temperature of a N-C fixed-point cell}, address = {Banf (Kanada)}, language = {en} } @inproceedings{HartmannWerner, author = {Hartmann, J{\"u}rgen and Werner, L.}, title = {Radiation thermometry towards the triple point of water?}, address = {Banf (Kanada)}, language = {en} } @misc{HartmannAnhaltZelenjuketal., author = {Hartmann, J{\"u}rgen and Anhalt, Klaus and Zelenjuk, A. and Taubert, Dieter Richard}, title = {New PTB Set-up for the absolute calibration of the spectral responsivity of radiation thermometers}, address = {Banf (Kanada)}, language = {en} } @inproceedings{HartmannMachinBloembergenetal., author = {Hartmann, J{\"u}rgen and Machin, Graham and Bloembergen, P. and Sadli, M. and Yamada, Y.}, title = {A concerted international project to establish hig-temperature fixed-points for primary thermometry}, address = {Banf (Kanada)}, language = {en} } @misc{HartmannSadliAnhaltetal., author = {Hartmann, J{\"u}rgen and Sadli, M. and Anhalt, Klaus and Schiller, S.}, title = {Thermal effects in the bb3200pg on m-c eutectic implementation}, address = {Banf (Kanada)}, language = {en} } @inproceedings{HartmannAnhaltWangetal., author = {Hartmann, J{\"u}rgen and Anhalt, Klaus and Wang, Y. and Yamada, Y.}, title = {Large and small aperture Fixed-point cells of Cu, Pt-C, and Re-c}, address = {Banf (Kanada)}, language = {en} } @inproceedings{HartmannAnhaltLoweetal., author = {Hartmann, J{\"u}rgen and Anhalt, Klaus and Lowe, D. and Machin, G. and Sadli, M. and Yamada, Y.}, title = {Thermodynamic Temperature determination of Co-C, Pd-C, Pt-C, and Ru-C eutectic fixed point cells}, address = {Davos (Schweiz)}, language = {en} } @inproceedings{BlotevogelEgermannGoldlueckeetal., author = {Blotevogel, Thomas and Egermann, Jan and Goldl{\"u}cke, J{\"u}rgen and Leipertz, Alfred and Hartmann, Matthias and Schenk, Martin and Berckm{\"u}ller, Martin}, title = {Untersuchungen zur Gemsichbildung in Wasserstoffmotoren}, editor = {Leipertz, Alfred}, publisher = {Esytec}, address = {Erlangen}, isbn = {3-931901-27-0}, pages = {12}, abstract = {Mittels der planaren laserinduzierten Fluoreszenz (PLIF) k{\"o}nnen im Brennraum eines Transparentmotors Messungen durchgef{\"u}hrt werden, die den Gemischbildungsprozess beim Wasserstoffmotor zweidimensional qualitativ darstellen. Auch quantitative Messungen und damit Aussagen {\"u}ber das Kraftstoff-Luft-Verh{\"a}ltnis im Brennraum sind m{\"o}glich. F{\"u}r diese Messungen wird ein Gasgemisch ans Helium und einer Tracersubstanz verwendet, und der Motor wird geschleppt. Bei Betrieb des Motors in der Teillast sind auch Messungen im gefeuerten Betrieb, d.h. mit Wasserstoff und zugesetzter Tracersubstanz, m{\"o}glich. Durch direkte Messung des Kraftstoff-Luft-Verh{\"a}ltnisses und der Wasserstoffkonzentration am befeuerten Aggregat mit Hilfe der Raman-Spektroskopie konnte nachgewiesen werden, daß mittels PLIF der Einstr{\"o}mvorgang qualitativ und das Kraftstoff-Luft-Verh{\"a}ltnis quantitativ grunds{\"a}tzlich richtig erfaßt werden. Qualitative und quantitative PLIF-Messungen sind prinzipiell nicht nur bei Wasserstoffmotoren, sondern auch bei Gasmotoren mit anderen Brenngasen denkbar. Allerdings sind noch weitere Arbeiten erforderlich, um den Quantifizierungsfehler deutlich abzusenken. Zuk{\"u}nftiges Verbesserungspotential f{\"u}r diese Meßtechnik besteht in verschiedenen Punkten. Dazu geh{\"o}rt die Optimierung und Anpassung der Mischstrecke zur Erzeugung des Gas-Luft-Gemisches mit definiertem Kraftstoff-Luft-Verh{\"a}ltnis an die jeweiligen Meßaufgaben, um den relativen Fehler des Lambda-Wertes noch weiter zu reduzieren. Eine Verringerung der Tracerkonzentration erscheint problemlos m{\"o}glich. Um das Problem der Hintergrundfluoreszenz zu l{\"o}sen, sind verschiedene M{\"o}glichkeiten denkbar, die noch genauer zu untersuchen sind.}, language = {de} } @article{HartmannMachinBloembergenetal., author = {Hartmann, J{\"u}rgen and Machin, Graham and Bloembergen, P. and Anhalt, Klaus and Sadli, M. and Saunders, P. and Woolliams, E. and Yamada, Y. and Yoon, H.}, title = {Practical implementation of the mise-en-pratique for the definition of the Kelvin above the silver point}, series = {International Journal of Thermophysics}, journal = {International Journal of Thermophysics}, number = {31}, pages = {1779 -- 1788}, language = {en} } @article{HartmannKhlevnoyRougieetal., author = {Hartmann, J{\"u}rgen and Khlevnoy, B. and Rougie, B. and Gibson, C. and Yoon, H. and Gaertner, A. and Taubert, Dieter Richard}, title = {CCPR-S1 Supplementary Comparison for Spectral Radiance in the range of 220 nm to 2500 nm}, series = {Metrologia}, journal = {Metrologia}, number = {46}, pages = {174 -- 180}, language = {en} } @article{HartmannKrenekAnhaltetal., author = {Hartmann, J{\"u}rgen and Krenek, S. and Anhalt, Klaus and Lindemann, A. and Hollandt, J{\"o}rg}, title = {A study on the feasibility of measuring the emissivity with the laser-flash method}, series = {International Journal of Thermophysics}, journal = {International Journal of Thermophysics}, number = {31}, pages = {998 -- 1010}, language = {en} } @article{HartmannAnhaltLindneretal., author = {Hartmann, J{\"u}rgen and Anhalt, Klaus and Lindner, D. and Kr{\"u}ger, U.}, title = {Camera based investigation of high-temperature fixed-points for radiometric application}, series = {Metrologia}, journal = {Metrologia}, number = {46}, pages = {260 -- 265}, language = {en} } @article{HartmannOjanenAnhaltetal., author = {Hartmann, J{\"u}rgen and Ojanen, M. and Anhalt, Klaus and Schiller, S. and Weckstr{\"o}m, T. and K{\"a}rh{\"a}, P. and Heinonen, M. and Ikonen, E.}, title = {Comparison of the radiation temperature scales between MIKES and PTB}, series = {Measurement}, journal = {Measurement}, number = {43}, pages = {183 -- 189}, language = {en} } @article{HoefflinSauerSchiffleretal., author = {H{\"o}fflin, Dennis and Sauer, Christian and Schiffler, Andreas and Hartmann, J{\"u}rgen}, title = {Process Monitoring Using Synchronized Path Infrared Thermography in PBF-LB/M}, series = {Sensors}, volume = {22}, journal = {Sensors}, number = {16}, publisher = {MDPI}, doi = {10.3390/s22165943}, pages = {5943}, abstract = {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.}, language = {en} } @incollection{HartmannHollandtSakumaetal., author = {Hartmann, J{\"u}rgen and Hollandt, J{\"o}rg and Sakuma, F. and Khlevnoy, B. and Morozova, S.}, title = {Blackbody and other Calibration Sources, in Radiometric Temperature Measurements Part I Fundamentals}, series = {Experimental Methods in the Physical Sciences}, volume = {42}, booktitle = {Experimental Methods in the Physical Sciences}, editor = {Zhang, Z.M. and Tsai, B.K. and Machin, Graham}, publisher = {Elsevier Academic Press}, address = {Amsterdam}, isbn = {978-0-12-374021-2}, pages = {241 -- 295}, language = {en} } @article{HartmannWernerFischeretal., author = {Hartmann, J{\"u}rgen and Werner, L. and Fischer, J. and Johannsen, U.}, title = {Accurate determination of the spectral responsivity of silicon trap detectors between 238 nm and 1015 nm using a laser-based cryogenic radiometer}, series = {Metrologia}, journal = {Metrologia}, number = {37}, pages = {279 -- 284}, language = {en} } @article{HartmannVoigtReichling, author = {Hartmann, J{\"u}rgen and Voigt, P. and Reichling, M.}, title = {Measuring local thermal conductivity in polycrystalline diamond with a high resolution photothermal microscope}, series = {J. Appl. Phys.}, journal = {J. Appl. Phys.}, number = {81}, pages = {2966 -- 2977}, language = {en} }