Method and apparatus for the nondestructive testing of vessels m

Details Method and apparatus for the nondestructive testing of vessels m Method and apparatus for the nondestructive testing of vessels m

1994-12-20

1995-09-05

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 355, 356348, G01B 902

Patent

active

054483522

ABSTRACT:
A vessel made of composite material wound on a metallic liner is tested via holographic interferometry, in which the interference of two holographic images of a tested zone are taken under two different states of thermal cycling. The thermal cycling is homogeneously applied to the entire liner, via a heated fluid placed inside the vessel. The interferogram is made outside the vessel, where a second image is made after having raised the liner to a temperature different from the one duly measured when the first image is made. The second image shot is controlled by the detection, outside and near the vessel, of a variation of the outer infrared radiation emitted by the vessel, resulting from the liner temperature variation being equal to a predetermined threshold value.

REFERENCES:
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patent: 3711202 (1973-01-01), Rush et al.
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patent: 3938889 (1976-02-01), McKinnis
patent: 3976380 (1976-08-01), Rottenkolber et al.
patent: 4234256 (1980-11-01), Yeager
patent: 4506981 (1985-03-01), Hoff, Jr.
patent: 4999681 (1991-03-01), Mader
Applied Optics, vol. 21, No. 20, Oct. 1982, New York Wagner et al.; Using Optical Correlation to Measure Leak Rates in Sealed Packages.

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