Radiant energy – Photocells; circuits and apparatus – Signal isolator
Patent
1994-03-02
1995-08-08
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Signal isolator
2502081, 250352, 250332, G02B 2700
Patent
active
054401399
ABSTRACT:
A method for communicating a signal representative of an infrared detector element's output to electrically and thermally isolated signal processing circuitry utilizes the steps of: varying the reflectivity of a photoreflective cell in response to the output of the infrared detector element such that the reflectivity of the photoreflective cell is representative thereof; resetting the photoreflective cell when the reflectivity thereof reaches a predetermined value; optically scanning the photoreflective cell with an optical scanner which is electrically and thermally isolated from the photoreflective cell; and counting the number of times the photoreflective cell is reset so as to provide a signal representative of the infrared detector element's output.
REFERENCES:
patent: H1354 (1994-09-01), Martinez
patent: 4328516 (1982-05-01), Colpack et al.
patent: 5118946 (1992-06-01), Smith
patent: 5151588 (1992-09-01), Kiri et al.
patent: 5200623 (1993-04-01), Cannata
patent: 5247183 (1993-09-01), Tocci
patent: 5324944 (1994-06-01), Soch et al.
patent: 5340984 (1994-08-01), Evans
Grumman Aerospace Corporation
Nelms David C.
Nichols Steven L.
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