Photometry, e.g. photographic exposure meter (spectrophotometry G01J3/00; specially adapted for radiation pyrometry G01J5/00 )

Child Classifications

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• G01J 1/02 Details
• G01J 1/10 by comparison with reference light or electric value
• G01J 1/38 using wholly visual means (G01J1/10 takes precedence)
• G01J 1/42 using electric radiation detectors (optical or mechanical part G01J1/04; by comparison with a reference light or electric value G01J1/10)
• G01J 1/48 using chemical effects
• G01J 1/56 using radiation pressure or radiometer effect
• G01J 1/58 using luminescence generated by light
• G01J 1/60 by measuring the pupil of the eye