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Electromagnetic piezoelectric acoustic sensor

  • US 7,770,456 B2
  • Filed: 06/04/2004
  • Issued: 08/10/2010
  • Est. Priority Date: 06/04/2003
  • Status: Expired due to Fees
First Claim
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1. An acoustic sensor comprising:

  • at least one resonant element;

    a driver comprising an electrical coupling means and an electromagnetic field source, arranged such that, in use, the electrical coupling means transfers current to the electromagnetic field source which produces an electromagnetic field that wirelessly drives the at least one resonant element, with matching resonances of the electromagnetic field source and the at least one resonance element, to produce acoustic waves directed to a predetermined part of a test sample, said electrical coupling means comprising a multiply resonant coaxial transmission line;

    an electromagnetic detector arranged to receive, in use, the acoustic spectrum emitted from the test sample after the acoustic waves have interacted with the test sample; and

    an electrical circuit connected to the driver and electromagnetic detector, the circuit arranged, in use, to provide the current and to detect, in combination with the electromagnetic detector, the acoustic spectrum received by the electromagnetic detector.

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