Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-12-27
1992-05-12
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356444, G01N 2186
Patent
active
051130815
ABSTRACT:
A web of photographic film or the like having an optical property to be inspected and measured (such as exposure density or reflectance) is transported through a flasher chamber at a predetermined nominal speed and is exposed to radiation in the flasher to produce a series of longitudinally spaced, transversely oriented exposure bands separated by unexposed bands on the web. The transport speed of the web through the exposure chamber is selected for a given exposure period for each band such that the web moves only a minor fraction of the longitudinal width of each band during exposure of the band. Subsequent inspection of the web, for example, in a densitometer, produces a pulsed output signal waveform in which the peak amplitudes of the pulses are proportional to the optical property being measured independent of any perturbations in transport speed of the web through the exposure chamber.
REFERENCES:
patent: 4176964 (1979-12-01), Knor et al.
patent: 4277177 (1981-07-01), Larsen et al.
patent: 4931657 (1990-06-01), Houston et al.
Boos, Jr. Francis H.
Davenport T.
Eastman Kodak Company
Nelms David C.
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