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.


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    Title :

    Smart ice detection systems based on resonant piezoelectric transducers


    Contributors:
    Roy, S. (author) / Izad, A. (author) / DeAnna, R.G. (author) / Mehregany, M. (author)

    Published in:

    Publication date :

    1998


    Size :

    8 Seiten, 9 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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