Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1986-08-26
1991-09-17
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250347, 250351, 359214, H01J 314, G02B 2610
Patent
active
050497405
ABSTRACT:
Images of two fields of view of one or two scenes in a radiation sensor are generated by use of a single detector and common signal process circuitry. The two imaged fields of view, typically a narrow view and a wide view, are provided by two independent telescopes (18, 20), and are combined by use of a field-of-view switch (32) comprising a chopper wheel (34) or an optical switch in synchronized operation with a mirror scanner (22). The same field-of-view switch is employed in performing detector non-uniformity correction functions, such as automatic responsivity control and direct current restoration. Folding optics couples scanned radiation from the scanner to the switch. An additional field of view may be introduced by displacing a folding mirror of the folding optics. Also, a portion of a reflecting surface of the switch may be tilted to admit a reference beam of radiation useful in performing the functions of responsivity control and D.C. restoration.
REFERENCES:
patent: 3519352 (1970-07-01), Engborg
patent: 3804976 (1974-04-01), Gard
patent: 4057734 (1977-11-01), Barringer
patent: 4455097 (1984-06-01), Ichikawa et al.
patent: 4486662 (1984-12-01), Abel
patent: 4574197 (1986-03-01), Kliever
patent: 4577106 (1986-03-01), Fukasawa et al.
Demas Themi H.
Pines Michael Y.
Schaefer Robert D.
Denson-Low Wanda K.
Hughes Aircraft Company
Streeter William J.
Westin Edward P.
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