Abstract

An integrating sphere with an inner diameter of 5 m was constructed with special attention in order to make a true sphere by welding together steel plates of thickness of 12 mm. The deviations of radii from a true sphere are within ±0.3%. A special lift, which is installed below the sphere, is used for changing a lamp or painting the sphere. The inner surface of the sphere was coated with a water paint of BaSO₄. Its spectral reflectance was measured by a method, in which a part of the spherical surface was substituted by a surface with low reflectance and spectrophotometric measurements were made on the luminance of the measurement window of the sphere before and after the substitution, operating a tungsten lamp in the sphere. The values of spectral reflectance obtained by this method were from 0.93 to 0.96 in the visible region, ten months after the coating.

© 1967 Optical Society of America

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