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. 2001 Feb 1;106(1):151–186. doi: 10.6028/jres.106.007

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The Journal of Research of the National Institute of Standards and Technology is a publication of the U.S. Government. The papers are in the public domain and are not subject to copyright in the United States. Articles from J Res may contain photographs or illustrations copyrighted by other commercial organizations or individuals that may not be used without obtaining prior approval from the holder of the copyright.

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Fig. 18 — Schematic drawing (not to scale) of the instrument used for spectral radiance measurement and realization of radiometric scales based upon known physical principles. The major components of the instrument are labeled in the figure.