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 - 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 T2 - AIP Conference Proceedings (684) N2 - Above the freezing point of silver (961.78 °C), the International Temperature Scale of 1990 is defined in terms of Planck’s radiation law. The scale is maintained and disseminated using a validated and linear pyrometer in conjunction with a blackbody reference source at either the Ag, Au (1064.18 °C) or Cu (1084.62 °C) freezing point. In order to realize the scale with the highest precision high quality, well‐characterised, reproducible fixed‐point blackbody sources are required. Such sources have been maintained at NPL for a number of years, but it was felt that improvements to the design would be beneficial. A new Ag point blackbody source has therefore been constructed. The new design will improve the quality and reproducibility of the melting and freezing plateaux and reduce errors due to the ‘out‐of‐focus’ size‐of‐source effect which is difficult to measure and to eliminate. Full details of the design of the new … Y1 - 2003 UR - https://aip.scitation.org/doi/abs/10.1063/1.1627244 SN - 0-7354-0153-5 SP - 909 EP - 914 PB - American Institute of Physics ER - TY - CHAP A1 - Hartmann, Jürgen A1 - Friedrich, R. A1 - Schiller, S. A1 - Fischer, J. ED - Fellmuth, B. ED - Seidel, J. ED - Scholze, G. T1 - Non-isothermal temperature distribution and resulting emissivity corrections for the high temperature blackbody BB3200 T2 - Proc. 8th International Symposium on Temperature and Thermal Measurements in Industry and Science - Proceedings of Tempmeko 2001 Y1 - 2002 SP - 227 EP - 232 PB - VDI Verlag CY - Berlin 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 - 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 - JOUR A1 - Hartmann, Jürgen A1 - Hollandt, Jörg A1 - Friedrich, R. A1 - Gutschwager, B. A1 - Taubert, Dieter Richard T1 - High-Accuracy Radiation Thermometry at the National Metrology Institute of Germany BT - the PTB JF - High Temperatures - High Pressures Y1 - 2005 VL - 35/36 IS - 4 SP - 379 EP - 415 ER - TY - JOUR A1 - Hartmann, Jürgen A1 - Friedrich, R. A1 - Taubert, Dieter Richard A1 - Hollandt, Jörg T1 - Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB JF - Metrologia Y1 - 2003 UR - http://permalink.bibkatalog.de/BV012573233 IS - 40 SP - 35 EP - 38 ER -