×

Ultrasonic anemometer

  • US 5,343,744 A
  • Filed: 03/06/1992
  • Issued: 09/06/1994
  • Est. Priority Date: 03/06/1992
  • Status: Expired due to Term
First Claim
Patent Images

1. In a fluid flow measurement system including at least two spaced apart electroacoustic transducing means, a process for determining ultrasonic signal propagation times along a bidirectional signal propagation path between the transducing means, including the steps of:

  • a. (i) causing a first one of the transducing means to generate a continuous wave acoustic signal in a first direction and receiving the continuous wave acoustic signal at the second transducing means;

    (ii) causing the second transducing means to generate the continuous wave acoustic signal in a second direction opposite to the first direction, and receiving the continuous wave acoustic signal at the first transducing means;

    (iii) causing the first transducing means to generate a single pulse acoustic signal in the first direction and receiving the single pulse acoustic signal at the second transducing means; and

    (iv) causing the second transducing means to generate the single pulse acoustic signal in the second direction and receiving the single pulse acoustic signal at the first transducing means;

    b. Determining respective signal propagation times TCW -1 and TCW -2 corresponding to propagation between the transmission means in the first and second directions based on respective phase comparisons of the sent and received continuous wave signal and determining a continuous wave time differential .increment.TCW based upon the difference in the respective propagation times;

    c. Measuring respective single pulse propagation times TSP -1 and TSP -2 corresponding to propagation of the single pulse in the first and second directions, and determining a pulse time differential .increment.TSP based on the difference in the respective signal propagation times; and

    d. Determining a value for the propagation time based upon a combination of the values .increment.TSP and .increment.TCW.

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