Detector signal conditioner

Details Detector signal conditioner Detector signal conditioner

1985-05-02

1987-09-08

Howell, Janice A.

Radiant energy

Infrared-to-visible imaging

250332, 250334, 250338, G01J 526

Patent

active

046926186

ABSTRACT:
In a system for imaging radiation of a subject (14), particularly infrared radiation, the radiation scanned past a set of detectors (12), each of which produces an output signal amplified by an individual amplifying channel. Each amplifying channel includes a forward amplifier (38) and a feedback amplifier (50), the latter driving a diode (46) to limit excursion of a detector signal to an amplitude which is sufficiently small to avoid saturation of the forward amplifier. The forward amplifier (38) is AC coupled between a detector (12) and an output display (18), the limiting action of the diode (46) preventing the buildup of excessive charge on the coupling capacitors (40, 42), thereby to permit a viewing of fine detail superposed on coarse detail of the subject being viewed. A low-pass filter (48) in the feedback branch provides a delayed response to the limiting action which permits the passage of high-frequency detail to be imaged on the display (18).

REFERENCES:
patent: 3895305 (1975-07-01), Longman, Jr.
patent: 4316103 (1982-02-01), Nathanson
patent: 4450479 (1984-05-01), Horne

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