Thermal imager
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United States of America Patent
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-
Jun 4, 1991
Grant Date -
N/A
app pub date -
May 15, 1989
filing date -
May 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermal imager employs an intermediate field stop (8) which is preferably placed at an intermediate image plane (P) in front of a cryogenically cooled detector (1) mounted on a substrate (2). Radiation gathered by a telescope is directed onto the detector through an aperture (9) in the field stop. The field stop limits the rays which are emitted by the detector and substrate and which are subsequently retro-reflected back to the detector (called narcissus rays).
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