G - Physics – 08 – B
Patent
G - Physics
08
B
340/139
G08B 1/08 (2006.01)
Patent
CA 1250926
ABSTRACT The ice warning system comprises a diaphragm {2} into vibration at one of its frequencies of resonance by a piezoelectric cell (3). The diaphragm (2) is thermi- cally coupled to a metallic plate (4) alternately cooled and heated respectively below and above the ambient temperature (Tu) by peltier elements (8) connected to a reversible DC current generator (11). A microprocessor (12) measures the variation of the resonance frequency caused by a deposit of ice on the diaphragm (2) during the cooling or heating periods and delivers an alarm signal whenever any variation of the frequency reaches and/or exceeds a predetermined value. The microprocessor (12) controls also the period, the magnitude and the direction of flow of the current from the current generator (11) in dependence on the ambient tempera- ture and the temperature of the diaphragm. The ice warning system is preferably utilized in the aeronauti- cal field for signaling the likelihood of natural ice formation on the engines and the wings of aircrafts.
494950
Fetherstonhaugh & Co.
Vibro-Meter Sa
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