Method and apparatus for remote detection and thickness measurem

Details Method and apparatus for remote detection and thickness measurem Method and apparatus for remote detection and thickness measurem

1994-01-27

1995-03-21

Evans, F. L.

Optics: measuring and testing

By configuration comparison

With photosensitive film or plate

340583, G01B 1106

Patent

active

054001447

ABSTRACT:
There is described a method and apparatus for detection and thickness evaluation of a buildup of ice or liquid on a solid surface, especially on a body of an aircraft. The apparatus comprises a source of a narrow beam of radiation and a means for remote evaluation of the size of a luminous area created on the solid surface by the beam. The method of the invention involves measuring the size of the luminous area and determining the thickness of any built-up layer, if sufficiently transparent, using a formula which uses the dependency of the size of the luminous are on the thickness of the layer and the refraction index of the medium. Differentiation between ice and a liquid is possible by evaluating regularity of illumination of the luminous area.

REFERENCES:
patent: 5180122 (1993-01-01), Christian et al.
patent: 5243185 (1993-09-01), Blackwood

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