Laser interferometry detection method/apparatus for buried struc

Details Laser interferometry detection method/apparatus for buried struc Laser interferometry detection method/apparatus for buried struc

1978-10-03

1979-10-30

Woodiel, Donald O.

Measuring and testing

With fluid pressure

Leakage

73655, G01M 304

Patent

active

041723821

ABSTRACT:
The present invention relates generally to the utilization of laser interferometry for performing detection of buried structures such as underground natural gas pipeline. More specifically, the invention relates to the use of a laser interferometer system for detecting leaks and similar defects, such as corrosion, in buried pipelines, pressurized containers or other metallic structures, based upon the sensing of subnanometer earth surface displacements produced by elastic waves which are emanated from the leak or defect and propagate in the surrounding earth medium.

REFERENCES:
patent: 3264864 (1966-08-01), Reid et al.
patent: 4086808 (1978-05-01), Camac et al.

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