An ice detection system consisting of a resonant piezoelectric sensing-element and microprocessor control has been developed to automatically and distinctly sense ice and water films up to 0.5 mm thick. Accretion of ice and/or water on the sensor surface modifies the effective mass and/or stiffness of the vibrating transducer; these variations are sensed by measuring the changes in transducer resonant frequency. In case of ice films, resonant frequency of the transducer increases steadily from 14 kHz for a 0.06-mm-thick layer to 28 kHz when the ice film is 0.45 mm thick. In contrast, transducer resonant frequency decreases slightly from 10 MHz for a 0.06-mm-thick layer of water to 9.5 MHz for a 0.45-mm-thick film. Repeatability experiments revealed test-to-test variations of 3.8 and 0.7% for ice and water films, respectively. Thermal cycling and stability tests showed that the dry transducer resonant frequency was 10.5+or-0.1 kHz at 25 degrees C, over a 220 h period. A portable, low-power, microprocessor-controlled electronic circuit has been designed and implemented to automate the resonant frequency measurement and determine the thickness of ice/water present on the transducer surface.
Smart ice detection systems based on resonant piezoelectric transducers
Sensors and Actuators, A, Physical ; 69 , 3 ; 243-250
1998
8 Seiten, 9 Quellen
Aufsatz (Zeitschrift)
Englisch
rechnerunterstützte Instrumentierung , Eis , intelligenter Sensor , piezoelektrischer Wandler , transportables Gerät , Wärmebeständigkeit , Dickenmessung , effektive Masse , Steifigkeit , Resonanzfrequenz , Flugzeug , Kalibrieren (Abgleichen) , elektrische Tastvorrichtung , Temperaturwechselbeanspruchung
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