Abstract
A high-speed, direct reading glossmeter which measures specular reflectance at 20°, 60°, and 85° angles has been developed. This instrument employs a direct parallel beam at each viewing angle, and utilizes an efficient optical system and compensated barrier cell circuits to activate a stable positioning servomechanism. The barrier cell circuitry combined with adjustable receptor apertures provide good linearity. Gloss values in ASTM units are read directly from the counter dial to the nearest 0.1 unit. Experience with glass, ceramic, and organic polymer films on flat surfaces has shown that repetitive measurements can be made five times faster and with greater reproducibility than with commercially available instruments. The eighteen instruments in current use demonstrate its suitability as both a laboratory and production control instrument.
© 1958 Optical Society of America
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