Method, apparatus and film strip of particular design for rapid

Details Method, apparatus and film strip of particular design for rapid Method, apparatus and film strip of particular design for rapid

1980-12-03

1982-12-28

Arnold, Bruce Y.

Optics: measuring and testing

For light transmission or absorption

Of photographic film

250559, 354298, G01N 2186, G01N 2159

Patent

active

043658954

ABSTRACT:
Apparatus and method for evaluation of a film processor, particularly an x-ray film processor, based on a photodetector signal sequentially indicating the optical density of graded density test areas on a developed film and comparing the output thereof to a preselected voltage relating to the acceptable/too dark threshold of an unexposed or base fog area, the acceptable or too light threshold of a maximum density or dark area and the acceptable/too light and acceptable/too dark threshold of a medium density test area. Sequence testing of the graded density areas is functionally related on a single film strip to timing marks, adapted to be read by photodetector and timing circuitry, the timing marks and graded density test areas being linearly spaced and relatively disposed along the length of film strip.

REFERENCES:
patent: 3995959 (1976-12-01), Shaber
patent: 4239395 (1980-12-01), Modisette

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