Reference channel for sensing optical contamination

Details Reference channel for sensing optical contamination Reference channel for sensing optical contamination

1984-05-29

1985-12-24

Howell, Janice A.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250342, G01J 100

Patent

active

045608741

ABSTRACT:
A simple lightweight apparatus for sensing excessive contamination on the faces of an array of light or infrared detectors comprises mounting a light or infrared-emitting diode near one or more of the detectors. When the diode is energized, the associated detectors should detect its radiation, thereby indicating that the detector is operable and that contamination is not excessive.

REFERENCES:
patent: 2892378 (1959-06-01), Canada
patent: 3586862 (1969-09-01), Topol
patent: 3872315 (1975-03-01), Boll
patent: 3901812 (1975-08-01), Hallengren
patent: 4119949 (1978-10-01), Lindgren
patent: 4188533 (1980-02-01), Ashenfelter et al.
patent: 4242669 (1980-12-01), Crick

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