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Optical Engineering

Optical Contamination Assessment by Bidirectional Reflectance-Distribution Function (BRDF) Measurement
Author(s): Vernon L. Williams; Richard T. Lockie
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Paper Abstract

Some optical systems can tolerate only a small amount of light scattering from mirror surfaces within the system. If low scatter mirrors are used in such an optical system, the mirrors must be monitored by some means to be sure that contamination does not increase the intrinsic scatter of the mirrors. In this paper the measurement technique of Bidirectional Reflectance-Distribution Function (BRDF) is presented as a method to monitor the scatter of mirror surfaces. A description of the test apparatus needed to measure BRDF is discussed. Curves are given which show how such contaminants as dust, hydrocarbon oil, acrylic, and peelable coating residue affect BRDF. It is shown that BRDF measurement provides a very practical and accurate method of measuring the scatter degradation of a low scatter mirror surface that has become contaminated.

Paper Details

Date Published: 1 April 1979
PDF: 5 pages
Opt. Eng. 18(2) 182152 doi: 10.1117/12.7972341
Published in: Optical Engineering Volume 18, Issue 2
Show Author Affiliations
Vernon L. Williams, Westinghouse Electric Corporation (United States)
Richard T. Lockie, Westinghouse Electric Corporation (United States)

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