Accession Number : AD0276052

Title :   SOME ANGULAR REFLECTANCE PROPERTIES OF LIGHT TRAPPING SURFACES

Corporate Author : NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s) : Drummeter,L. F. , Jr. ; Fowler,W. B.

Report Date : 12 APR 1962

Pagination or Media Count : 14

Abstract : The reflection characteristics of a matte (dull) black finish on sheet aluminum were modified by placing a layer of glossy-black-finished aluminum honeycomb over the matte-black surface. After modification of the glossy front edges of the honeycomb with a dull-black finish, there was a net drop in the angular reflectance and considerable reduction of specular reflection. Examination of sample surfaces with a goniophotometer showed the honeycomb surface to be comparable in many respects to black velvet for various viewingANGLES IN THE PLANE OF INCIDENCE. In situations where black velvet is inadequate for use as a light-trapping material, e.g., in vacuum chambers, the honeycomb surface has obvious application and is a better material to use for this purpose than a matte-black paint surface. (Author)

Descriptors :   *HONEYCOMB CORES, *REFLECTION, *SURFACES, PAINTS, PHOTOMETERS, SANDWICH PANELS

Distribution Statement : APPROVED FOR PUBLIC RELEASE