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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G01J1/08
Arrangements of light sources specially adapted for photometry; standard sources, also using luminescent or radioactive material
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G01J2001/086
Calibrating drift correction
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