System for detection of ice, water, glycol solution, and other c

Communications: electrical – Aircraft alarm or indicating systems – Icing indicator

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250574, 2505781, 340583, 340604, 356136, G08B 1902

Patent

active

055963200

ABSTRACT:
Ice in particular and also other substances such as water and glycol-containing anti-icing fluids can be detected and distinguished by means of differences in their optical index of refraction. A plurality of beams at different angles of incidence are multiplexed onto the reverse side of an optical surface which is embedded in a surface to be monitored or otherwise positioned in a sampling environment. The reflected beams at the different angles are measured and refractive indexes calulated form the measured reflected beams. If the calculated refractive indexes are the same at all angles, then the substance is positively identified. If the values do not agree, then there is partial coverage, and the substance may be identified by comparison with predetermined values. The system is applicable to aircraft, where in-flight and pre-flight monitoring of icing conditions and surface contamination is needed.

REFERENCES:
patent: 4851817 (1989-07-01), Brossia et al.
patent: 4913519 (1990-04-01), Klainer et al.
patent: 5014042 (1991-05-01), Michoud et al.
patent: 5083018 (1992-01-01), Rhyne
patent: 5396325 (1995-03-01), Carome et al.

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