by comparison with reference light or electric value

Introduced: September 1968

Last revised: January 2006

Full Title

Photometry, e.g. photographic exposure meter > by comparison with reference light or electric value

Section:: PHYSICS
Class:: MEASURING; TESTING
Subclass:: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY

3 direct subcodes

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G01J 1/12 using wholly visual means
G01J 1/16 using electric radiation detectors
G01J 1/2 intensity of the measured or reference value being varied to equalise their effects at the detector, e.g. by varying incidence angle