by comparison with reference light or electric value

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

3 direct subcodes

Child Classifications

Navigate with arrow keys, Enter to open

G01J 1/12 using wholly visual means (G01J1/20 takes precedence)
G01J 1/16 using electric radiation detectors (G01J1/20 takes precedence)
G01J 1/20 intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle