Infrared imager forming two narrow waveband images of the same o

Details Infrared imager forming two narrow waveband images of the same o Infrared imager forming two narrow waveband images of the same o

1991-12-12

1993-11-02

Hannaher, Constantine

Radiant energy

Infrared-to-visible imaging

Including detector array

2503384, 250339, 359359, G01J 351

Patent

active

052586189

ABSTRACT:
The invention relates to an improved IR imaging system for detecting a target producing an IR signature obscured by an ambient IR background. The imager comprises an objective lens, preferably of a telecentric design, and an area IR detector array. Two narrow wavebands are selected by an unpatterned bandpass filter, and a two part patterned filter, one part a long pass filter and the other part a short pass filter, installed close to the IR detector array. This choice permits the patterned filters to be quite thin, and more readily formed into smaller elements allowing increased image resolution. The use of a telecentric objective lens and the use of filters having higher average indices of refraction permit a wide field of view without compromising filter operation from filter wavelength shift.

REFERENCES:
patent: 4783593 (1988-11-01), Noble
patent: 4996427 (1991-02-01), Noble et al.
patent: 5072109 (1991-12-01), Aguilera, Jr. et al.

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