Scanning focused local oscillator optical heterodyne imaging sys

Details Scanning focused local oscillator optical heterodyne imaging sys Scanning focused local oscillator optical heterodyne imaging sys

1978-07-03

1980-03-25

Griffin, Robert L.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

356349, 358 90, 358 95, H04N 718

Patent

active

041952219

ABSTRACT:
In an optical heterodyne system a first coherent light signal is received on an ordered array of light responsive elements, and a local oscillator source provides a second coherent light signal, the frequencies of the first and second coherent light signals being different. Mixing apparatus is provided to focus the second coherent light signal upon each of the light responsive elements of the array in a preselected sequence, and scanning apparatus scans the light responsive elements in the same preselected sequence to receive light responsive signals generated by the light responsive elements, each of the light responsive signals being related to the intensity of light impinging upon a different one of the light responsive elements and having a frequency equal to the difference between the frequencies of the first and second coherent light signals.

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patent: 3856988 (1974-12-01), Funk
patent: 3868658 (1975-02-01), Kiemle
patent: 4030831 (1977-06-01), Gowrinathan

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