Process for detecting the likelihood of ice formation, ice warning system for carrying out the process and utilization thereof
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United States of America Patent
Stats
-
Feb 18, 1986
Grant Date -
N/A
app pub date -
May 7, 1984
filing date -
Feb 27, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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