Near-field photometric method and apparatus

G - Physics – 01 – J

Patent

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G01J 1/00 (2006.01) G01J 1/42 (2006.01)

Patent

CA 2077179

A near-field goniophotometric apparatus and method for measuring the three-dimensional near-field distribution of luminous flux surrounding a light source. The apparatus incorporates an imaging photometer mounted on a rotatable arm. The photometer is designed to measure the helios of a volume of space rather than the luminance of a planar surface, and to simultaneously measure the helios of a plurality of such volumes. A control mechanism is provided to position the arm and to rotate the light source relative to the arm. The method facilitates prediction of the illuminance or irradiance at a point on a plane from the helios measurements.

L'invention est constituée par un appareil et une méthode de goniophotométrie en champ proche qui sont utilisés pour mesurer la distribution tridimensionnelle en champ proche du flux lumineux au voisinage d'une source lumineuse. L'appareil de l'invention comprend un photomètre d'imagerie qui est monté sur un bras tournant. Ce photomètre est conçu pour mesurer la luminance d'un volume plutôt que celle d'une surface plane, et pour mesurer simultanément les luminances d'une pluralité de volumes. Un mécanisme de commande est utilisé pour positionner le bras et faire tourner la source lumineuse par rapport à celui-ci. La méthode de l'invention facilite la prévision de l'éclairement ou de l'éclairement énergétique en un point d'un plan à partir de mesures de la luminance.

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