Technique for optical non-uniformity correction of an imaging sy

Details Technique for optical non-uniformity correction of an imaging sy Technique for optical non-uniformity correction of an imaging sy

1980-07-15

1981-11-24

Smith, Alfred E.

Radiant energy

Infrared-to-visible imaging

Including detector array

250342, H01J 3149, G01J 100

Patent

active

043026737

ABSTRACT:
A technique for optical non-uniformity correction of a focal plane imaging ystem wherein incoming objective scene light rays impinging on each detector in a focal plane array is corrected on a pixel-by-pixel basis by optical correction means from a separate optical source. The optical correction means is comprised of a multiplicative correction means and an additive correction means. The multiplicative correction means is comprised of a responsivity mask positioned on or near the focal plane that provides a multiplicative factor of unity or less to each detector to cause more uniform sensitivity of the detectors. The additive correction means is comprised of the separate optical source that is positioned in a separate optical train and is comprised of an additive optical correction mask aligned with a light source and focusing screen means and image relay that relay the additive optical correction sensitizing illumination onto the focal plane array or the pixel-by-pixel basis. The additive correction may be used alone.

REFERENCES:
patent: 3536917 (1970-10-01), Desvignes
patent: 3629601 (1971-12-01), Firester
patent: 4160907 (1979-07-01), Bly
patent: 4178522 (1979-12-01), MacLennan et al.
patent: 4262198 (1981-04-01), Gupta et al.

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