Design and Characterization of a Photometer/Colorimeter Standard

Published

August 1, 2003

Author(s)

J Racz, George P. Eppeldauer

Abstract

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.

Citation

Journal of Applied Optics

Pub Type

Journals

Keywords

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

Citation

Racz, J. and Eppeldauer, G. (2003), Design and Characterization of a Photometer/Colorimeter Standard, Journal of Applied Optics (Accessed October 31, 2024)