Abstract

A reflectometer based on an integrating sphere operating in the 0.8–2.5-μm region is described. The reflectometer is of the absolute type and does not need a standard diffuse reflecting surface to obtain absolute reflectance values. The system is fully automatic, using computer-controlled circular variable filters as monochromators. Results for BaSO₄ in the region between the visible and 2.5 μm show considerable deviations from the accepted values of reflectivity for this substance.

© 1987 Optical Society of America

Absolute reflectometer for the mid infrared region

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