Volumetric leak detection means and method

Details Volumetric leak detection means and method Volumetric leak detection means and method

1988-11-29

1989-10-17

Noland, Tom

Measuring and testing

With fluid pressure

Leakage

73293, 250577, G01M 338, G01F 2322

Patent

active

048738638

ABSTRACT:
An apparatus for detecting volumetric leaks includes an arrangement for measuring linear displacement of a surface, including the surface of a liquid. The arrangement includes a beam generator for directing a collimated or coherent beam of energy onto a surface, a non-planar mirror to receive the beam as it reflects from the surface, and a receptor for receiving the beam as it is reflected from the mirror. Changes in position of a footprint of the beam on the receptor correlate to changes in displacement of the surface and accordingly, volumetric changes of a contained liquid. The non-planar mirror amplifies or exaggerates the changes in the position of the footprint relative to linear displacement of the surface so as to enable detection of small displacements of the surface.

REFERENCES:
patent: 3741656 (1973-06-01), Shapiro
patent: 4365165 (1982-12-01), Vedova
patent: 4373815 (1983-02-01), Bruce
patent: 4508970 (1985-04-01), Ackerman
patent: 4732035 (1988-03-01), Lagergren et al.
SRI International, Final Report, Sep. 1981, "Measurement of Small Leaks in Underground Gasoline Storage Tanks Using Laser Interferometry", Maresca, Jr. et al., pp. 7, 10, 23, 111-113, and 36-37..
Sensors, Sep. 1985, "Asporated Vapor Sensing for Leak Detection", Hanselka et al., p. 38.
Viatran Pressure Measurement Solutions, Viatran Corporation.

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