Communications: electrical – Aircraft alarm or indicating systems – Icing indicator
Patent
1995-04-28
1997-01-21
Swann, Glen
Communications: electrical
Aircraft alarm or indicating systems
Icing indicator
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.
Optical Sensor Consultants Inc.
Sartorio Henry P.
Swann Glen
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