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 <i>in situ</i> for installed concentrators. Additional information regarding small-scale reflector waviness and surface reflectivity can also be obtained from the same measurement with additional analysis.
© 2000 Optical Society of America
(000.4430) General : Numerical approximation and analysis
(080.2740) Geometric optics : Geometric optical design
(120.4290) Instrumentation, measurement, and metrology : Nondestructive testing
(120.7000) Instrumentation, measurement, and metrology : Transmission
Andreas Timinger, Abraham Kribus, Harald Ries, Toni Smith, and Markus Walther, "Optical assessment of nonimaging concentrators," Appl. Opt. 39, 5679-5684 (2000)