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Abstract

The photogoniometer is composed of a computer-controlled movable mechanical support, presenting two main rotation axes that are powered by DC motors. It uses an accurate and reliable gear technology (harmonic drivers) and is controlled by a micro-computer. The light source is placed 6 meters above. It consists of a short-arc discharge lamp (2.5 kW HMI) combining high luminous efficiency (96 lumen/Watt) with a daylight-close spectum (5600 K); it is placed in a floodlight projector equiped with a hyperbolic mirrored reflector, Fresnel lens and an optical conic element to enhance beam uniformity. A high illuminance uniformity is observed on the sample (better than 3%).

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