ISSN: 1945-7553
Page Count: 5

A Comparison of Two Methods for Measuring Light Scattered from Aerospace Transparencies

Marasco, PL
Research physicist,, AFRL/HECV,, Wright-Patterson AFB,,OH

(Received 27 February 2000; accepted 28 July 2000)

Abstract

ASTM D 1003 is often used to characterize light scattered (haze) from aerospace transparencies. However, due to the strong angular dependence of light scattered from these materials, information gathered using ASTM D 1003 is limited in determining the effect of scatter on visual performance. Another technique, one capable of measuring scattered light as a function of observation angle and illumination angle similar to ASTM E 167, is more time consuming to perform but yields information that may be better suited to visual modeling. Even though the techniques are considerably different, it is possible to compare measurements made on several samples using these two methods. This paper compares the results of measurements made using both test procedures on a number of transparent parts.

Keywords:
light scatter, haze, ASTM D 1003, ASTM E 167, aerospace transparencies

Paper ID: JTE12140J
DOI: 10.1520/JTE12140J
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