Optics: measuring and testing – Range or remote distance finding – With photodetection
Patent
1980-04-03
1982-08-24
Hix, L. T.
Optics: measuring and testing
Range or remote distance finding
With photodetection
354324, 356444, G03D 1300
Patent
active
043458319
ABSTRACT:
A film processor having film transport rollers driven by a drive motor, a sensor for generating a signal representative of roller transport speed and a film density detector arrangement that includes a photodetector responsive to the intensity of a light source for generating a reference background level signal against which processed film is compared is characterized by a monitoring arrangement which periodically samples the photodetector output signal and adjusts a reference background level signal in accordance with fluctuations in the output of the scanner arrangement. To prevent the system from reacting to momentary perturbations in background level a moving weighted averaging technique is employed. The rate at which the reference background level signal is sampled is determined by the transport roller speed.
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Brady W. J.
E. I. Du Pont de Nemours and Company
Hix L. T,.
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