Photoelectric ice accumulation monitor using dual detectors

Details Photoelectric ice accumulation monitor using dual detectors Photoelectric ice accumulation monitor using dual detectors

G - Physics

08

B

340/139, 33/60

G08B 19/02 (2006.01)

Patent

CA 1275313

ABSTRACT Apparatus and method using internal reflection of electromagnetic radiation to detect ice or water on pavements or other surfaces and to continuously measure the thickness of the accumulation. A prism which is transparent to pulses of electromagnetic radiation from an emitter is mounted in the pavement with an exposed prism surface flush with, and in the plane of the surface being monitored for the accumulation. Radiation from an emitter is directed at the exposed prism surface at an angle so that the radiation is totally reflected when the exposed surface is bare, but only partially reflected when there is an accumulation. Radiation detectors are positioned so that changes in the intensity of internally- reflected radiation are measured and interpreted to detect the onset of an accumulation, measure the thickness of the accumulation, distinguish accumulations of ice from accumulations of water, and distinguish accumulations of mud or dirt from accumulate ions of ice or water.

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