Thermal imager

Details Thermal imager Thermal imager

1988-02-03

1990-06-12

Hannaher, Constantine

Radiant energy

Infrared-to-visible imaging

2502521, 250334, 2504931, G01J 548

Patent

active

049335553

ABSTRACT:
A thermal imager including a cryogenically cooled detector element array and a scanning element has an optical system with a field of view limited by a field stop (2). A retroreflective region (6) is provided on part of the field stop to act as a temperature reference by allowing the detector array to "look at" itself. A second, different temperature reference (5) is provided on another part of the field stop and the two references are used to equalize and adjust the output characteristics of the elements in the detector array.

REFERENCES:
patent: 3478211 (1969-11-01), Moser
patent: 3617745 (1971-11-01), Reed
patent: 4163602 (1979-08-01), Schutz et al.
patent: 4280050 (1981-07-01), Callender et al.
patent: 4419692 (1983-12-01), Modisette et al.
patent: 4421985 (1983-12-01), Billingsley et al.
patent: 4450479 (1984-05-01), Horne
patent: 4524385 (1985-06-01), Billingsley et al.
patent: 4705945 (1987-11-01), Worcester

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