Thermal imager

Details Thermal imager Thermal imager

1981-05-12

1983-05-10

Britton, Howard

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358150, 358209, H04N 718

Patent

active

043832717

ABSTRACT:
A thermal imager comprises a scanner (13), detector (14) with mount (14A) cooled substantially below ambient temperature, and which via a reflector (16) on the locus (15) along which an image of the detector (14) is effectively scanned provides a characteristic radiation feature to the detector (14) in superimposition with the scanned radiation from the scanner (13). The scanner (13) operates with less than 50% efficiency so that in the detector output signal the scene-derived waveform has a duration T.sub.1 <50%T, where T is the period of the detector output signal. The characteristic radiation feature gives rise to a sync signal at the detector output and is located prior to and closely adjacent the scene-derived waveform at a time interval T.sub.2 prior to the end thereof. This sync signal is detected by a recognition circuit (20) and activates a monostable forming part of a clock circuit (22) for a duration T.sub.3 such that T.sub.2 <T.sub.3 <50%T. The clock circuit (22) controls the timing of signal processing circuitry (24) and a video output device (25) connected to the output of the detector (14).

REFERENCES:
patent: 3751586 (1973-08-01), Johansson
patent: 3812483 (1974-05-01), Graves
patent: 3944730 (1976-03-01), Dahlqvist

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