Optical: systems and elements – Lens – Annular zonal correcting
Patent
1997-09-17
1999-03-23
Nguyen, Thong
Optical: systems and elements
Lens
Annular zonal correcting
359357, 359362, 359642, 359711, G02B 1318, G02B 1314
Patent
active
058868348
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: 4679891 (1987-07-01), Roberts
patent: 5142416 (1992-08-01), Nakamura et al.
patent: 5282083 (1994-01-01), Hall
Harder James A.
Herrera Val J.
Nguyen Thong
Raytheon TI Systems Inc.
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