Aeronautics and astronautics – Aircraft structure – Ice prevention
Patent
1984-05-07
1986-02-18
Blix, Trygve M.
Aeronautics and astronautics
Aircraft structure
Ice prevention
340582, 244134R, B64D 1520
Patent
active
045708819
ABSTRACT:
An ice warning system comprising a diaphragm set into vibration at one of its frequencies of resonance by a piezoelectric cell. The diaphragm is coupled thermally to a metallic plate alternately cooled and heated respectively below and above the ambient temperature by Peltier elements connected to a reversible DC current generator. A microprocessor measures any variation of the resonance frequency caused by a deposit of ice on the diaphragm during the cooling or heating periods and delivers an alarm signal if this variation of frequency reaches and/or exceeds a predetermined value. The microprocessor controls the period, intensity and direction of the current delivered by the DC current generator as a function of the ambient temperature and the temperature of the diaphragm. The ice warning system is preferably utilized in the aeronautical field for indicating the likelihood of natural ice formation on the engines and the wings of aircraft.
REFERENCES:
patent: 3240054 (1966-03-01), Roth
patent: 3270330 (1966-08-01), Weinberg
patent: 3276254 (1966-10-01), Richard
patent: 3341835 (1967-09-01), Werner et al.
patent: 3541540 (1970-11-01), Hughes
patent: 4176524 (1979-12-01), Kamiyama et al.
patent: 4290299 (1981-09-01), Pozin
Blix Trygve M.
Corl Rodney
Vibro-Meter SA
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