Optical gaging system

Details Optical gaging system Optical gaging system

1977-12-08

1979-07-10

Corbin, John K.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

250560, G01B 1106

Patent

active

041605993

ABSTRACT:
An electro-optical gaging system which comprises a linear array of photo-sensitive diodes where the thickness of an object against a dark background is measured by determining the number of diodes which are discharged due to light incident thereon from the object. Each diode of the array is sequentially scanned during a scanning cycle to recharge the capacitance of the discharged diodes and the number of charging pulses is a measurement of the thickness of the object. A separate photo-sensitive element senses the light conditions and generates pulses which determine the repetition rate of the scanning cycle to maintain system calibration. A start scan signal is also utilized to determine that the light intensity is within predetermined limits.

REFERENCES:
patent: 3565531 (1971-02-01), Kane
patent: 3632226 (1972-01-01), Filby et al.
patent: 3667846 (1972-06-01), Nater et al.
patent: 3835313 (1974-09-01), Stiefelmeyer et al.

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