Long-term stability of the spectral responsivity of filter radiometers at the PTB 

New PTB set-up for the absolute calibration of the spectral responsivity of radiation thermometers 

Irradiance measurements of Re-C, TiC-C and ZrC-C fixed-point blackbodies 

L. Werner, J. Hartmann: Calibration and interpolation of the spectral responsivity of silicon photodiode based detectors,
Sensors & Actuators: A. Physical

J Hartmann, L. Werner: Radiation thermometry towards the triple point of water? International Journal of Thermophysics 29 1052-1065 (2008)

K. Anhalt, A. Zelenjuk, D.R. Taubert, J. Hartmann: New PTB Set-up for the absolute calibration of the spectral responsivity of radiation thermometers; International Journal of Thermophysics

J. Hartmann: High-temperature measurement techniques for the application in photometry radiometry and thermometry, Physics Reports 469 205-269 (2009)

K. Anhalt, J. Hartmann, D. Lowe, G. Machin, M. Sadli, Y. Yamada: Thermodynamic temperature determinations of Co-C, Pd-C Pt-C and Ru-C eutectic fixed-points cells, Metrologia 43(2) S78-S83 (2006)

J. Hartmann, K. Anhalt, P. Sperfeld, J. Hollandt, M. Sakharov, B. Khlevnoy, Yu. Pikalev, S. Ogarev, V. Sapritsky: Thermodynamic measurements for the melting curves of Re-C, TiC-C, and ZrC-C eutectics,
in Proceedings of Tempmeko 2004, D. Zvizdic (Ed.) , LPM/FSB, Zagreb (2005) 189-194

J. Hartmann: Correct consideration of the index of refraction using blackbody radiation,
Optics Express 14(18) 8121-8126 (2006) 

D.R. Taubert, R. Friedrich, J. Hartmann, J. Hollandt:
Improved calibration of the spectral responsivity of interference filter radiometers in the visible and near infrared spectral range at PTB
Metrologia 40 S35-S38 (2003)

J. Hartmann, J. Fischer, U. Johannsen, L. Werner: Analytical model for the temperature dependence of the spectral responsivity of silicon,
J. Opt. Soc. Am. B 18 942-947 (2001)