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Method for locating leakage of substances from subterranean structures

  • US 5,557,277 A
  • Filed: 09/06/1994
  • Issued: 09/17/1996
  • Est. Priority Date: 09/06/1994
  • Status: Expired due to Term
First Claim
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1. A method for producing an image representative of a pattern of leakage of a fluid from a structure buried in the ground, comprising the steps of:

  • translating an antenna array over an area of said ground having said structure buried therein;

    transmitting and receiving a signal having a discrete frequency selected from a predetermined range of frequencies at each of a plurality of points in said area;

    storing complex reflectance values having phase and intensity components in a computer memory, each said reflectance value representative of said signal received at one of said points;

    Fourier transforming said stored complex reflectance values to form a received spatial spectrum;

    propagating said received spatial spectrum to a predetermined depth;

    inverse Fourier transforming the propagated spectrum to form a calculated image representative of said pattern of leakage of said fluid; and

    displaying said calculated image.

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