Electronic effective focal length compensator

Details Electronic effective focal length compensator Electronic effective focal length compensator

1996-02-20

1997-09-02

Hannaher, Constantine

Radiant energy

Infrared-to-visible imaging

Including detector array

250334, 348295, G01J 500, H04N 533

Patent

active

056635630

ABSTRACT:
A system for producing a high quality scene image in a thermal imaging system by electronically compensating for variations in the imaging system imager focal length. The system includes optics (16, 18) for detecting a scene (14), a detector assembly (27) being responsive to energy from the detected scene; and an imager (25) for imaging the energy from the detected scene onto the detector assembly (27). The imager (25) includes a temperature sensor (25b) for sensing imager lens temperature. The detector assembly (27) outputs electric signals in response to the energy from the detected scene at a first clock sample rate. The system further includes a processor (84) for controlling the first clock sample rate of the detector assembly to maximize detected scene image quality through variation of the first clock sample rate to automatically compensate for imager lens focal length variation due to ambient temperature changes in the imager lens (25a) and due to inherent manufacturing tolerances.

REFERENCES:
patent: 4466748 (1984-08-01), Needham
patent: 4728804 (1988-03-01), Norsworthy
patent: 5453781 (1995-09-01), Stein
patent: 5510618 (1996-04-01), Blecha et al.

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