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Sensors for detecting electromagnetic parameters utilizing resonating elements

  • US 4,897,541 A
  • Filed: 06/02/1988
  • Issued: 01/30/1990
  • Est. Priority Date: 05/18/1984
  • Status: Expired due to Term
First Claim
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1. A transducer apparatus for detecting a physical parameter comprising:

  • a body that changes dimension in response to the parameter;

    a resonator adapted to vibrate mechanically at a resonance frequency, said resonator connected to said body so that when said body changes dimension, said body applies a force on said resonator or causes the resonator to change dimension, thereby modulating the resonance frequency of the resonator;

    means for supplying light to the resonator to resonate the resonator; and

    means for optically detecting modulations of the resonance frequency of the resonator caused by the force applied by the body to detect said parameter.

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