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Inverse fourth power photometric calibrator
Inverse fourth power photometric calibrator
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机译：逆四次方光度校准器
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摘要
A photometric calibrator is disclosed wherein a known and continuously variable amount of light flux received at a detector is linearly proportional to the inverse fourth power of the optical path length between the detector and a primary, quasi-point source of the light flux. The calibrator includes a secondary, quasi-point light flux source wherein the total flux emitted thereby is proportional to the flux received thereby over a quasi-point detecting area located at some distance, d, from the primary source. The detector is located at an equal distance d from the secondary source.
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