An optical measurement method for nonimaging radiation concentrators is proposed. A Lambertian light source is placed in the exit aperture of the concentrator. Looking into the concentrator’s entrance aperture from a remote position, one can photograph the transmission patterns. The patterns show the transmission of radiation through the concentrator with the full resolution of the four-dimensional phase space of geometric optics. By matching ray-tracing simulations to the measurement, one can achieve detailed and accurate information about the geometry of the concentrator. This is a remote, noncontact measurement and can be performed in situ for installed concentrators. Additional information regarding small-scale reflector waviness and surface reflectivity can also be obtained from the same measurement with additional analysis.
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Joseph O’Gallagher, Walter T. Welford, and Roland Winston
J. Opt. Soc. Am. A 4(1) 66-68 (1987)
E. M. Kritchman
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Herbert L. Tardy
Appl. Opt. 24(22) 3914-3916 (1985)