Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Design and Characterization of a Photometer/Colorimeter Standard



J Racz, George P. Eppeldauer


A photometer/tristimulus colorimeter has been developed at the National Institute of Standards and TEchnology (NIST) to realize a color scale. A novel construction was developed to implement the spectral responsivity based scale with small uncertainty. The new device can be used as a reference illuminance and luminance meter as well. Temperature controlled filter combinations, with 5 to 8 layers in one package, are used to match the responsivity of a Si tunnel-trap detector to the CIE color matching functions with small spectral mismatch values (fi). Design considerations to extend the tunnel-trap detector withreplaceable single and double apertures and changeable filter combinations are described. Design and fabrication of the filter packages and the dependence of the fi values on the thickness of the filter layers is discussed. The colorimeter was characterized for angular, spatial, and spectral responsivity. An improved preamplifier can convert current to voltage in 11 decade dynamic range with 0.01% uncertainty.
Journal of Applied Optics


chromaticity, colorimeter, filters, illuminance luminance, photometer, spectral responsivity, standard, trap detector, tristimulus


Racz, J. and Eppeldauer, G. (2003), Design and Characterization of a Photometer/Colorimeter Standard, Journal of Applied Optics (Accessed May 27, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created July 31, 2003, Updated October 12, 2021