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PCE
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CPC Subgroup
G01J 1/34

using separate light paths used alternately or sequentially, e.g. flicker

Full Title

Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > by comparison with reference light or electric value > intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle > using separate light paths used alternately or sequentially, e.g. flicker

1 direct subcode

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