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Apparatus for indicating fluid flow velocity

  • US 3,894,431 A
  • Filed: 02/06/1974
  • Issued: 07/15/1975
  • Est. Priority Date: 04/04/1972
  • Status: Expired due to Term
First Claim
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1. Apparatus for use in measuring the velocity or a component of velocity of fluid flow, which apparatus comprises first and second units spaced apart and each adapted to transmit and receive pressure wave pulses travelling over a path through the fluid in the direction in which velocity component is to be measured, variable frequency oscillator means, timing control means for defining time intervals of duration independent of the frequency of the variable frequency oscillator means, trigger means under control of the said timing control means for causing a pressure wave pulse to be transmitted from the First unit to the second unit and, separately, from the second unit to the first unit, and control means for adjusting the variable frequency oscillator means to generate a first frequency dependent upon the time taken for a pressure wave pulse to travel from the first unit to the second unit and, separately under control of said timing control means, to generate a second frequency dependent upon the time taken for a pressure wave pulse to travel from the second unit to the first unit, and a difference determining means for determining the difference between said first and second frequenices.

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