Automatic blanking circuit

Details Automatic blanking circuit Automatic blanking circuit

1979-12-26

1981-03-24

Rosenberger, R. A.

Optics: measuring and testing

For light transmission or absorption

By comparison

250565, 356 40, G01N 2100

Patent

active

042577098

ABSTRACT:
In an optical system including a light source and a photodetector, a circuit and method for compensating for degradation of the optical system which may include deterioration in the intensity of the light source, caused by a variety of factors such as dirt, aging of the light source, etc., or dirt on the photodetector. The intensity of the light from the light source as received by the photodetector is repeatedly measured and an average value determined which accurately indicates the intensity of the light received. Subsequent use of the optical system includes comparison to the most recent average value of light received by the photodetector. Hence the present system eliminates the need for repeated calibration of the optical system by providing the same effect as though the system were being repeatedly and automatically calibrated to account for system degradation.

REFERENCES:
patent: 3528749 (1970-09-01), Bowker
patent: 3678505 (1972-07-01), Mostyn
patent: 3992113 (1979-11-01), Egli et al.

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