Abstract

To measure the refractive index of high gloss dielectric surfaces, an automatic method for locating Brewster’s angle was developed. The measurement is made by using a recording goniophotometer equipped with a special drive linkage for rotating the sample holder at one-half the rate of rotation of the receptor arm. Although developed for index of refraction measurements of paint films, the technique is applicable to any glossy dielectric surface where the angle for specular reflection is well defined. Either opaque or clear films can be measured, but clear films must be applied to depolished black glass or similar surface in order to eliminate specular reflection from the substrate interface. The accuracy of the method is about 0.01 in refractive index.

© 1957 Optical Society of America

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