A gonio-spectrophotometer developed and built at the Institute of Optics of CSIC by the research group GiMRO is described. It was designed to allow absolute radiometrical measurements to be carried out within the hemispheres behind and in front of the sample, being the primary interest the measurement of the Bidirectional Scattering Distribution Function (BSDF) of materials. The instrument is fully automated and capable to perform actual retro-reflectance measurements
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