Andreas Winkler, Bernhard Zagar,
"Building a gonioreflectometer - a geometrical evaluation"
: 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2015) Proceedings, Seite(n) 1900-1905, 5-2015, ISBN: 978-1-4799-6113-9
Building a gonioreflectometer - a geometrical evaluation
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2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC 2015) Proceedings
A gonioreflectometer is a device for measuring the reflectance properties of the surface of a specimen by means of the bidirectional reflectance distribution function (BRDF). In order to scan the 4D BRDF parameter space, such a device requires at least one light source and one detector and the ability to move at least two of the following: light source, detector, and specimen. In this work we analyze the geometry of a conceptual measurement device where the specimen is moved by three rotary stages assembled to form a gimbal mount. The camera-as detector-remains fixed, and the light source is moved along a circular trajectory centered on the specimen surface. The model presented allows evaluation of the subspace of the BRDF parameter space that is accessible using a given measurement setup.