Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test
Patent
1988-08-02
1989-10-10
Cuchlinski, Jr., William A.
Thermal measuring and testing
Leak or flaw detection
With heating or cooling of specimen for test
374 44, 374124, 374141, 374137, 250330, 356 43, 358100, 358107, 358113, G01N 2572
Patent
active
048727628
ABSTRACT:
A method and an apparatus for detecting a defective portion on the inner surface of a pipe, the outer surface of which is exposed, includes: heating or cooling a pipe, the outer surface of which is exposed, from the side of the outer surface thereof so that a difference in temperature is produced between a portion of the outer surface of the pipe corresponding to an accumulation of foreign matters or a thinner portion as a defective portion on the inner surface thereof, and a portion of the outer surface of the pipe corresponding to a normal portion of the inner surface thereof; then shooting the outer surface of the pipe by means of a thermal imaging system while the above-mentioned difference in temperature still remains on the outer surface of the pipe to obtain a thermal image of the difference in temperature; and detecting the accumulation of foreign matters or the thinner portion as the defective portion of the inner surface of the pipe by means of the thus obtained thermal image.
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patent: 3566669 (1971-03-01), Lawrence et al.
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McLaughlin, D. V., et al., "Non-Destructive Examination of Fibre Composite Structures by Thermal Field Techniques", NDT International, Apr. 1980, pp. 56-62.
Pollack, Frank G., et al., "Surface Temperature Mapping with Infrared Photographic Pyrometry", NASA Tech. Brief No. 69-10113, Jun. 1969.
Ishihara Koji
Koshihara Toshio
Matoba Yuji
Misawa Rokurou
Sagawa Yuzo
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
NKK Corporation
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