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Differential phase velocity determining delay measurement apparatus and associated method

  • US 5,698,786 A
  • Filed: 11/28/1995
  • Issued: 12/16/1997
  • Est. Priority Date: 11/28/1995
  • Status: Expired due to Term
First Claim
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1. A sensing apparatus for generating an output signal related to at least one sensed quantity, said sensing apparatus comprising:

  • at least one ultrasonic delay sensor;

    pulse recirculating means operatively connected to said at least one ultrasonic delay sensor for recirculating pulses therethrough to generate a pulse repetition signal having a frequency related to delay of said ultrasonic delay sensor;

    time base means for generating a time base signal having a fixed frequency; and

    differential phase velocity output means for generating an output signal related to delay in said at least one ultrasonic delay sensor based upon a difference in phase velocity between the pulse repetition signal and the time base signal.

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