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

Published

September 1, 1997

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

NIST Pub Series

Journal of Research (NIST JRES)

Pub Type

NIST Pubs

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 October 13, 2025)