Patent classifications
G
PHYSICS
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G01
MEASURING; TESTING
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G01J
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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1/00
Photometry, e.g. photographic exposure meter
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G01J1/10
by comparison with reference light or electric value; provisionally void
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G01J1/20
intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
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G01J1/28
using variation of intensity or distance of source
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G01J1/30
using electric radiation detectors
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