Leakage test for liquid containment

Measuring and testing – Vibration – By mechanical waves

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Details

73 405A, G01M 324, G01N 2904

Patent

active

046974563

ABSTRACT:
A method for detecting leakage from an in-ground liquid containment having a nominally impermeable floor, wherein a source emits a burst and a row of sensors are placed on an opposing side of the containment to receive boundary wave energy transmitted along the containment floor. Traces from the sensors show a regular pattern of boundary wave amplitude or arrival time, with irregularities indicative of regions of floor defects. The sensors each receive energy propagated along a strip radiating from the source. To locate leakage, the method is repeated with source and sensors oriented across a second direction. Irregularities in first and second crossing strips indicate a defect located in the region of intersection of the two strips. Power spectrum analysis of the traces identifies particular types of floor defects, and baseline measurements correct for natural subterranean features.

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