Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1982-09-30
1985-07-16
Chin, Tommy P.
Facsimile and static presentation processing
Facsimile
Recording apparatus
H04N 104
Patent
active
045300100
ABSTRACT:
A dynamic infrared scene projector for presenting cinematic, two-dimensional, spatially distributed scene data to an infrared sensor is provided comprising programmable, thermoptic infrared modulators which exploit thermally-induced changes in the infrared optical properties of a thin film of vanadium dioxide. Because of a hysteresis in the vanadium dioxide material, a stored scene can be created in the modulators by scanning a focused modulated visible or near-infrared laser beam across the thin film while it is thermally biased in the hysteresis loop. The scene is projected into the sensor by placing the modulators between an infrared source/condenser system and a system of projection optics. Dynamic scene projection is accomplished by an erase/rebias system and an optical framing switch to yield a flicker-free output. Erasing of the optical modulator is accomplished by momentarily cooling the VO.sub.2 film to a temperature below the hysteretic loop. Rebiasing of the optical modulators is accomplished by reheating to increase the temperature of the thin film to a value not exceeding a thermal bias temperature.
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Cate James M.
Chin Tommy P.
LTV Aerospace and Defense Company
Sadacca Stephen S.
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