Method for locating leakage of substances from subterranean stru

Details Method for locating leakage of substances from subterranean stru Method for locating leakage of substances from subterranean stru

1994-09-06

1996-09-17

Lobo, Ian J.

Communications: directive radio wave systems and devices (e.g.,

Transmission through media other than air or free space

324326, G01S 1388, G01S 1389

Patent

active

055572774

ABSTRACT:
A method for imaging substances leaking from underground structures using continuous-wave signals includes translating an antenna array over the ground, transmitting a continuous-wave signal into the ground at an array of points, detecting the amplitude and phase of the reflected signal at each point, transforming the reflectance values into the frequency domain, propagating this reflectance spectrum to a predetermined depth, and transforming the propagated spectrum into an image in the spatial domain at that depth. An image representing the underground structure containing the substance may be overlayed on the calculated image to detect differences that represent leakage. Successive images of the same area may be produced over a period of time and the differences compared to determine the rate of leakage.

REFERENCES:
patent: 4706031 (1987-11-01), Michiguchi et al.
patent: 5327139 (1994-07-01), Johnson
patent: 5410252 (1995-04-01), Potter et al.

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