Passive scene base calibration system

Details Passive scene base calibration system Passive scene base calibration system

1997-09-17

1999-09-21

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359356, 359708, 250332, G02B 2300, G02B 1314, H01L 2500

Patent

active

059561769

ABSTRACT:
An image detection system (10) uses an optical configuration for both image forming and calibration phases of operation. A field lens (20) has an inner portion (36) of a conventional prescription to allow for collection of scene based energy for an opto-electronic approximation of the infrared detail within the afocal field of view by a focal plane array (32). The field lens (20) also has an outer portion (38) that collects far field energy from a scene area (A.sub.I) through a converging point (P.sub.I). The energy collected from the scene area (A.sub.I) is indicative of the average energy level within the scene. The electrical equivalent values of all energy received from the unique area (A.sub.I) is stored in a multidimensional range used for subsequent gain and offset calibration coefficient calculations.

REFERENCES:
patent: H1066 (1992-06-01), Petropoulos et al.
patent: 4950896 (1990-08-01), Liebson
patent: 4965448 (1990-10-01), Morse et al.
patent: 5142416 (1992-08-01), Nakamura et al.
patent: 5282083 (1994-01-01), Hall
patent: 5400161 (1995-03-01), Lambert, Jr.

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