Abstract

Freezing points of In, Sn, Zn, Al, Ag, Au, and Cu, along with the melting point of Ga, are among the defining fixed points of the International Temperature Scale of 1990. Accordingly blackbody sources have been commercially produced that utilize the freezing/melting points of the above metals for precision radiometric calibrations of noncontact thermometers. The cavity emissivity is estimated to be 0.999, and the fixed point metals have a nominal purity of 99.9999%. We analyze the freezing plateau of a Au freezing point blackbody and show that the accuracy of calibrating a narrow-band radiometer at 960 nm is (−0.17 ± 0.02) K.

© 1996 Optical Society of America

Thermodynamic-temperature determinations of the Ag and Au freezing temperatures using a detector-based radiation thermometer

Howard W. Yoon, David W. Allen, Charles E. Gibson, Maritoni Litorja, Robert D. Saunders, Steven W. Brown, George P. Eppeldauer, and Keith R. Lykke
Appl. Opt. 46(15) 2870-2880 (2007)

High-temperature miniature blackbody radiation sources

Semen M. Chernin
Appl. Opt. 36(7) 1580-1591 (1997)

Precision blackbody sources for radiometric standards

V. I. Sapritsky, B. B. Khlevnoy, V. B. Khromchenko, B. E. Lisiansky, S. N. Mekhontsev, U. A. Melenevsky, S. P. Morozova, A. V. Prokhorov, L. N. Samoilov, V. I. Shapoval, K. A. Sudarev, and M. F. Zelener
Appl. Opt. 36(22) 5403-5408 (1997)

Blackbody calibration sources of high accuracy for a spaceborne infrared instrument: the Along Track Scanning Radiometer

I. M. Mason, P. H. Sheather, J. A. Bowles, and G. Davies
Appl. Opt. 35(4) 629-639 (1996)

Realization of the National Institute of Standards and Technology detector-based spectral irradiance scale

Howard W. Yoon, Charles E. Gibson, and Patricia Y. Barnes
Appl. Opt. 41(28) 5879-5890 (2002)