Measuring and testing – With fluid pressure – Leakage
Patent
1984-06-27
1986-09-23
Levy, Stewart J.
Measuring and testing
With fluid pressure
Leakage
356347, G01M 304, G01M 338
Patent
active
046127976
ABSTRACT:
A leak locating, mapping and measuring system (10) comprising an image recording medium (32), a laser (18), optical components (22) which cooperate with the laser to produce and superimpose successive holographic images of the test subject (12) upon the recording medium, a video camera (34) trained upon the medium and a real-time monitor (35) and recorder (36) for processing the output of the camera to assist analysis. The device is operated to create a first, reference hologram of the test subject while it is in an unpressurized state. A second holographic image is then taken while the test subject is pressurized with fluid from tank (38), which image is superimposed over the reference image. The resultant lines of interference between the superimposed images are then analyzed for distortions (66), which distortions indicate the location and magnitude of leakage flows at or about the test subject. Each holographic image may be created with laser beams of a selected duration which diminishes the effects of vibration in the test subject.
REFERENCES:
patent: 3802758 (1974-04-01), Havener et al.
patent: 4492468 (1985-01-01), Huignard et al.
Giterman et al., "Determining Sensitivity in Inspecting for Tightness by the Holographic Interferometry Method", Sov. J. Nondestr. Test., vol. 14, No. 4, Apr. 1978, pp. 378-382.
Nakatani et al., "Flow Visualization by an Improved Double Exposure Method in Holography", Optics and Laser Technology, Apr. 1974, pp. 82-83.
Shatilov et al., "Recording of Pulsed Gasdynamic Processes by Holographic Shearing Interferometry", Fluid Mechanics--Soviet Research, vol. 5, No. 1, Jan.-Feb. 1976, pp. 154-162.
Newport Corporation, 1983-84 Catalog, pp. 184-186.
Chapman, Jr. John E.
Field Harry B.
Ginsberg Lawrence N.
Hamann H. Fredrick
Levy Stewart J.
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