Determination of Radiance Temperatures Using Detectors Calibrated for Absolute Spectral Power Response

Published

June 1, 1999

Author(s)

Howard W. Yoon, Charles E. Gibson

Abstract

We describe a method of directly determining blackbody radiance temperatures using filter detectors calibrated for absolute spectral power responsivity. The calibrations for absolute power are derived from a highly-accurate cryogenic radiometer, and radiance temperatures are determined using a measurement equation which describes the relationship between the measured signal and the blackbody radiance temperature. Using the calibrated filter detectors, we have measured the radiance temperature of the variable-temperature blackbody used in the dissemination of the U.S. National Scale of Radiance Temperature. We compare the results of theabsolute detector-based method with the temperatures obtained with the NIST Photoelectric Pyrometer (PEP) which determines the radiance temperatures using the methods of ITS-90. We show that the detector-based radiance temperature determinations are in agreement with the measurements of the PEP to within 0.5 K in the range of blackbody temperatures from 2200K to 2800K, and the resultant uncertainties in radiance temperatures using the detector-based method can be factor of two smaller than those found usingthe PEP.

Proceedings Title

Temperature and Thermal Measurements in Industry and Science; TEMPMEKO '99, International Symposium | 7th | | Nmi Van Swinden Laboratorium

Volume

2

Conference Dates

June 1-2, 1999

Conference Location

Delft, NL

Conference Title

TEMPMEKO

Pub Type

Conferences

Keywords

absolute detectors, ITS-90, pyrometry, radiation temperature, spectral irradiance

Citation

Yoon, H. and Gibson, C. (1999), Determination of Radiance Temperatures Using Detectors Calibrated for Absolute Spectral Power Response, Temperature and Thermal Measurements in Industry and Science; TEMPMEKO '99, International Symposium | 7th | | Nmi Van Swinden Laboratorium, Delft, NL (Accessed May 9, 2025)