New optical systems for the measurement of diffuse reflectance

Details New optical systems for the measurement of diffuse reflectance New optical systems for the measurement of diffuse reflectance

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..643...84s&link_type=abstract

IN: Infrared, adaptive, and synthetic aperture optical systems; Proceedings of the Meetings, Arlington, VA, Apr. 8, 1985 and Orl

Computer Science

Performance

Diffuse Radiation, Mirrors, Optical Measurement, Reflectance, Concentrators, Ellipsoids, Parabolas, Performance Prediction

Scientific paper

The measurement of diffuse reflectance is presently undertaken by a novel two-stage optical system that consists of a single ellipsoidal or dual paraboloidal primary mirror and a nonimaging compound parabolic concentrator (CPC) as the secondary. In the direct mode, the uniformity of the detector/CPC response over the hemisphere overcomes the disadvantage of using ellipsoid or paraboloid-type reflectometers in the direct mode. In the reciprocal mode, the CPC's larger aperture is occupied by a high temperature source which offers less stray radiation than a cavity-type source with comparable Lambertian properties.

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