NEAR-FIELD GONIOPHOTOMETRY: A METROLOGICAL CHALLENGE

Near-field goniophotometry, which provides luminance distribution of a light source, is a very suitable tool for generating ray data needed for the design of modern luminaries. International efforts are currently being put into elaborating guidelines for the measurement procedures and traceability of near-field goniophotometric measurements. In order to support the traceability of such measurements, PTB has recently installed a near-field goniophotometer. The first results of near-field measurements carried out with this goniophotometer are presented, and the problems of establishing the traceability of these measurements are also shown in this paper.