Apparatus and method for remote detection of ice or other birefr

Details Apparatus and method for remote detection of ice or other birefr Apparatus and method for remote detection of ice or other birefr

1995-03-15

1997-07-22

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356368, 340583, G02F 101

Patent

active

056506104

ABSTRACT:
An apparatus and method are provided for remotely detecting ice on a polarization preserving surface. A target location on the surface is irradiated with two cross-polarized beams of coherent light. A determination is then made as to whether the speckle patterns from each of the two beams interfere with one another. If interference of the speckle patterns from the two beams is detected, ice or some other birefringent material is said to be present on the surface.

REFERENCES:
patent: 4668860 (1987-05-01), Anthon
patent: 4701052 (1987-10-01), Schoen, Jr.
patent: 4725145 (1988-02-01), Azzam
patent: 5170049 (1992-12-01), De Jonge et al.
patent: 5243185 (1993-09-01), Blackwood

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