Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1988-07-28
1990-10-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250330, G01D 536
Patent
active
049654470
ABSTRACT:
Incident infrared radiation is focussed through a rotatable disk of germam onto a detector array. The disk has a thickness many times the wavelengths of the incident radiation and is partly covered with a pattern of germanium one-half wavelength of some preselected wavelength of the incident radiation. The pattern is a regular array of mesas, and acts as a phase grating which diffracts incident radiation. The diffracted (or blurred) image on the detector array is used as a reference level for background suppression.
REFERENCES:
patent: 4322620 (1982-03-01), Steinhage
patent: 4814602 (1989-03-01), Imura
Advena Donna J.
Bly Vincent T.
Terrill Conrad W.
Dunn Aubrey J.
Lane Anthony T.
Lee Milton W.
Nelms David C.
The United States of America as represented by the Secretary of
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