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Method of and apparatus for measuring flow velocity by using ultrasonic waves

  • US 4,930,358 A
  • Filed: 03/21/1988
  • Issued: 06/05/1990
  • Est. Priority Date: 03/27/1987
  • Status: Expired due to Fees
First Claim
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1. A method of measuring the flow velocity of a fluid by using ultrasonic waves, comprising:

  • providing two ultrasonic transducers, spaced from each other a predetermined distance Lx, wherein said ultrasonic transducers provide ultrasonic waves with a small angle of directivity on the upstream and downstream sides, respectively, of a piping;

    causing the ultrasonic waves to alternately and obliquely enter into said piping through the outer wall thereof so as to measure sound velocities C1 of wedge portions in said ultrasonic transducers at the time of measurement; and

    propagating the ultrasonic waves from the upstream side to the downstream side and from the downstream side to the upstream side at approximately the time of said measurements so that the propagation times td and tu, which represent propagation times of the ultrasonic waves through the wall of the piping and the fluid in said piping, are measured in sequence, and said measured values C1, td, tu and the distance Lx between said ultrasonic transducers are substituted into a function, V=F(C1,tu,td,Lx), which is calculated by use of known constants, to thereby specify the flow velocity of the fluid in said piping.

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