Multi-level retarder plate polarization dependent imaging

Details Multi-level retarder plate polarization dependent imaging Multi-level retarder plate polarization dependent imaging

1995-07-11

1996-06-18

Britton, Howard W.

Television

Image falsification to improve viewer perception of...

348 61, 348273, 348335, 348340, H04N 5225

Patent

active

055282873

ABSTRACT:
A system for detecting the presence of an energy polarization altering dielectric material, such as ice or snow, on a surface, such as a part of an aircraft, which normally specularly reflects incident energy, such as light, when there is no such dielectric present. The energy is conveyed from a transmitter along a path to the surface and the incident energy is reflected from the surface along a path to a receiver with a dielectric on the surface destroying any polarization, such as circular, of the energy and that reflected from a specular portion maintaining the polarization. An optical system in one or both of the paths operates in an isolator state to produce an image of the dielectric portion having a first intensity level and that of the specular portion passing through the optical system having a different intensity level. When the optical system is operated alternately in isolator and non-isolator states it produces an image of the dielectric portion having a relatively steady intensity level and that of the specular portion alternating between first and second different intensity levels corresponding to the isolator and non-isolator states of the optical system.

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patent: 5475370 (1995-12-01), Stern

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