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Passive sensor system using ultrasonic energy

  • US 5,619,997 A
  • Filed: 01/27/1995
  • Issued: 04/15/1997
  • Est. Priority Date: 01/28/1994
  • Status: Expired due to Term
First Claim
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1. A passive sensor system utilizing ultrasonic energy, the system comprising:

  • at least one ultrasonically vibratable sensor having at least one vibration frequency, each vibration frequency being a function of a physical variable to be sensed, said physical variable being selected from the group consisting of temperature and viscosity; and

    an ultrasonic activation and detection system for exciting said sensor and for detecting said at least one vibration frequency thereby to determine a value of said physical variable.

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