×

Long wavelength acoustic flowmeter

  • US 4,445,389 A
  • Filed: 09/10/1981
  • Issued: 05/01/1984
  • Est. Priority Date: 09/10/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. An acoustical flowmeter for measuring at least one parameter of a moving fluid, said flowmeter comprising:

  • means for producing substantially planar acoustic waves at a distance having a wavelength λ

    ;

    first means for receiving said acoustic waves, said first means located apart from said producing means at said distance at least in a direction parallel to said direction of movement of said moving fluid,second means, spaced apart from said first means at least in a direction parallel to a direction of movement of said moving fluid, for receiving said acoustic waves;

    means for insuring that the spacing between said first and second means in said direction parallel to said direction of movement of said moving fluid, is a spacing equal to mλ

    /2, where m is any integer;

    means for measuring phase difference between acoustic waves received at said first and second means; and

    means, responsive to said phase difference measuring means, for indicating said at least one parameter.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×