Thermal imaging apparatus
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United States of America Patent
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May 22, 1984
Grant Date -
N/A
app pub date -
Apr 15, 1982
filing date -
Apr 29, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The 'narcissus' effect in a thermal imaging apparatus employing scanned arrays of cooled infrared radiation detectors is produced, in part, by the detectors seeing themselves by reflection in the surfaces of the optical elements during the middle part of the scan. The narcissus effect results in a darkened center in the displayed picture. To compensate for this effect, a signal is formed of the sum of the detector outputs. This signal is applied in negative feedback to each detector output. Extended bright or dark areas are suppressed but picture detail special to individual detectors is largely unaffected.
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