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Proceedings Paper

Evaluation of the radiation characteristics of a high-temperature blackbody
Author(s): Benjamin K. Tsai; B. Carol Johnson; Robert D. Saunders
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Paper Abstract

Development of a new spectral irradiance scale realization at the National Institute of Standards and Technology (NIST) requires a careful and complete calibration of a high- temperature blackbody between 1200 K and 2800 K. Filter radiometers have been calibrated to measure the spectral radiance (or radiance temperature) of the blackbody. Using a monochromator, the blackbody spectral radiance will then be used to determine the spectral irradiance distributions of primary and secondary spectral irradiance lamp standards at NIST. In this paper, a calibrated pyrometer and V((lambda) ) filter radiometer will be used to evaluate the high-temperature blackbody for determination of the optimum calibration method for the blackbody. The blackbody apparatus will be described in detail. When the power supply is the sole source of current control, the blackbody current is stable to within 0.056%, resulting in 0.72% for the uncertainty in the blackbody spectral radiance. To achieve our goal of 0.1% in the final blackbody radiance, a blackbody current stability of 0.007% is required. Due to the day-to-day variations in the current, calibrations of the blackbody msut be made frequently. Several feedback control options are recommended as possible solutions for improving both the short term and long term current stability.

Paper Details

Date Published: 29 September 1995
PDF: 10 pages
Proc. SPIE 2553, Infrared Spaceborne Remote Sensing III, (29 September 1995); doi: 10.1117/12.221381
Show Author Affiliations
Benjamin K. Tsai, National Institute of Standards and Technology (United States)
B. Carol Johnson, National Institute of Standards and Technology (United States)
Robert D. Saunders, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 2553:
Infrared Spaceborne Remote Sensing III
Marija Strojnik; Bjorn F. Andresen, Editor(s)

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