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Developments for a New Spectral Irradiance Scale at the National Institute of Standards and Technology

Published

Author(s)

Benjamin K. Tsai

Abstract

Recent developments for a new spectral irradiance scale realization at the National Institute of Standards and Technology have been targeted to reduce the present relative expanded uncertainties of 0.67 % to 4.34 % (coverage factor of k =2and thus a 2 standard deviation estimate) in the spectral irradiance scale to 0.17 % for the range from 350 nm to 1100 nm. To accomplish this goal, a suite of filter radiometers calibrated using NIST s high accuracy cryogenic radiometerhave been used to measure the temperature of a high-temperature blackbody. A comparison of the filter radiometer calibrations with the spectral irradiance scale along with an evaluation of the blackbody calibration technique have been performed. With the aid of a monochromator, the calibrated filter radiometers will then be utilized to calibrate primary and secondary spectral irradiance standard lamps at NIST.
Citation
Journal of Research (NIST JRES) -
Volume
102 No. 5

Keywords

blackbody, filter radiometer, scale realization, spectral irradiance, uncertainty

Citation

Tsai, B. (1997), Developments for a New Spectral Irradiance Scale at the National Institute of Standards and Technology, Journal of Research (NIST JRES), National Institute of Standards and Technology, Gaithersburg, MD (Accessed July 25, 2024)

Issues

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Created September 1, 1997, Updated February 17, 2017