System for detecting ice or snow on surface which specularly ref

Details System for detecting ice or snow on surface which specularly ref System for detecting ice or snow on surface which specularly ref

1995-07-11

1996-07-02

Britton, Howard W.

Television

Special applications

348571, 340583, 356369, H04N 718, G08B 1902

Patent

active

055327389

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 potion alternating between first and second different intensity levels corresponding to the isolator and non-isolator states of the optical system.

REFERENCES:
patent: 4682222 (1987-07-01), Smith
patent: 5020920 (1991-06-01), Gopalsami
patent: 5180122 (1993-01-01), Christian
patent: 5287183 (1994-02-01), Thomas
patent: 5475370 (1995-12-01), Stern

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