by comparison with reference light or electric value

Introduced: September 1968

Full Title

Full titles differ between systems:

IPC:

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

CPC:

Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 ) > by comparison with reference light or electric value

IPC and CPC are identically structured here. All 3 subcodes exist in both systems.

3 shared codes have differing titles between IPC and CPC.

Child Classifications

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G01J 1/12 using wholly visual means (G01J1/20 takes precedence) +1 CPC IPC+CPC Available in IPC and CPC
G01J 1/16 using electric radiation detectors (G01J1/20 takes precedence) +6 CPC IPC+CPC Available in IPC and CPC
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 IPC+CPC Available in IPC and CPC