Browsing by Subject "Air coupled longitudinal wave transmissions"

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    Surface micromachined capacitive ultrasonic transducers
    (Institute of Electrical and Electronics Engineers, 1998-05) Ladabaum, I.; Jin, X.; Soh, H. T.; Atalar, Abdullah; Khuri-Yakub, B. T.
    The current state of a novel technology, surface microfabricated ultrasonic transducers, is reported. Experiments demonstrating both air and water transmission are presented. Air-coupled longitudinal wave transmission through aluminum is demonstrated, implying a 110 dB dynamic range for transducers at 2.3 MHz in air. Water transmission experiments from 1 to 20 MHz are performed, with a measured 60 dB SNR at 3 MHz. A theoretical model is proposed that agrees well with observed transducer behavior. Most significantly, the model is used to demonstrate that microfabricated ultrasonic transducers constitute an attractive alternative to piezoelectric transducers in many applications.