Near-field photometric method and apparatus
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United States of America Patent
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Oct 12, 1993
Grant Date -
N/A
app pub date -
Sep 6, 1991
filing date -
Sep 6, 1991
priority date (Note) -
Expired
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Abstract
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.
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