1 MHz Ultrasonic Transducer Operating in Air

  • Tsutomu Yano
  • Masayuki Tone
  • Akira Fukumoto
Part of the Acoustical Imaging book series (ACIM, volume 14)


Conventional ultrasonic air transducers operating below 100 kHz have been utilized for position sensing in the range of 0.1–10m and provide several unique advantages. A typical application of an ultrasonic air transducer is to the wide range distance measurement of an optically transparent object placed “very close to” up to “relatively far from” the transducer. Additionally the real-time measurement can be done with simple signal processing. However, conventional air transducers have very wide beamwidths and relatively long pulse response characteristics which make it difficult to detect a small and nearby object.


Insertion Loss Acoustic Impedance Acoustic Property Range Finder Matching Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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  1. 1.
    J.S. Schönwald, J.F. Martin and L.A. Ahlberg, Acoustic-scanning for robotic range sensing and object pattern recognition, IEEE Ultrasonics Symposium, Proc. 2, 945 (1982).Google Scholar
  2. 2.
    R.C. Bryant and R.E. Bogner, Ultrasonic surface imaging in adverse environments, IEEE Trans. Sonics & Ultrason., SU-31, 4: 373 (1984).Google Scholar
  3. 3.
    C. Canali, G.D. Cicco, B. Morten, M. Prudenziati and A. Taroni, An ultrasonic proximity sensor operating in air, Sensors and Actuators 2, 97 (1981/82).Google Scholar
  4. 4.
    J.D. Fox, B.T. Khuri-Yakub and G.S. Kino, High-frequency acoustic wave measurements in air, IEEE Ultrasonics Symposium Proc. 1, 581 (1983).Google Scholar
  5. 5.
    M. Tone, T. Yano and A. Fukumoto, High-frequency ultrasonic transducer operating in air, Japanese J. Appl. Phys. 23 6: L436 (1984).ADSCrossRefGoogle Scholar
  6. 6.
    E.K. Sitting, Mason’s equivalent circuit, in Physical Acoustics Vol. 9, W.P. Mason and R.N. Thurston, ed., Academic Press New York (1982).Google Scholar

Copyright information

© Plenum Press, New York 1985

Authors and Affiliations

  • Tsutomu Yano
    • 1
  • Masayuki Tone
    • 1
  • Akira Fukumoto
    • 1
  1. 1.Matsushita Research Institute Tokyo, Inc.Tama-ku, KawasakiJapan

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