×

Method and apparatus for the ultrasonic measurement of the flow velocity of fluent media

  • US 3,981,191 A
  • Filed: 08/11/1975
  • Issued: 09/21/1976
  • Est. Priority Date: 07/05/1975
  • Status: Expired due to Term
First Claim
Patent Images

1. In apparatus for the measurement of fluid flow rate using ultrasonic signals, said apparatus having first and second transducers positioned in relative upstream and downstream locations in communication with the fluid to be measured for alternately transmitting said ultrasonic signals in opposite senses therebetween, the combination comprising:

  • a timing generator for controlling the transmission times of said ultrasonic signals and generating a reference signal delayed with respect to each said transmission time,comparator means for generating early and late signals according to whether the received ultrasonic signals are early or late relative to each said reference signal,a first signal level generator responsive to at least some of said early and late signals for generating a first signal level related to sound speed in said fluid,logic means responsive to said comparator means and to the sense of transmission of said ultrasonic signals for generating early and late signals correlated with transmission direction upstream and downstream,a second signal level generator responsive to at least two of said early and late signals correlated with transmission direction for generating a second signal level different than said first level related to said fluid flow rate, andadder means responsive to said first and second signal levels for generating control signals related respectively to the upstream and downstream speeds of sound for controlling the timing of said timing generator.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×