Two-color photoelectric detectors having an integral filter

Details Two-color photoelectric detectors having an integral filter Two-color photoelectric detectors having an integral filter

1975-02-28

1976-06-08

La Roche, Eugene

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250211J, 250211R, 250339, 350316, G01J 350

Patent

active

039625788

ABSTRACT:
Two photoelectric detector elements, having substantially different response wavelengths, are mounted in a housing in cascade relationship. The outer element is selected to be transparent to the response wavelength of the inner element and it is provided with an integral filter that is transmissive at the response wavelength of the inner element. Anti-reflective coatings are used to minimize reflective losses.

REFERENCES:
patent: 3107302 (1963-10-01), Coleman
patent: 3770958 (1973-11-01), Krakow

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