Abstract
Determination of photometric properties of retroreflectors used especially on cars, motorways and clothes for safety of traffic is very important. To characterize the retroreflection properties of such materials, a retroreflection measurement system was constructed at TÜBİTAK-UME. The measurement system is composed of a lighting projector, a two-dimensional goniometer, reference and observation photometer heads with transimpedance amplifiers and an analog digital converter card with a developed software. The system is capable of measuring both luminous intensity and retroreflection coefficients of retroreflective materials at observation angles varying from 0.1° to 5°.
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