Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test
Patent
1989-03-07
1991-01-29
Yasich, Daniel M.
Thermal measuring and testing
Leak or flaw detection
With heating or cooling of specimen for test
250341, 374124, 374136, 392407, G01N 2572, G01M 300
Patent
active
049882104
ABSTRACT:
A method and apparatus for detecting a defective portion on the outer surface not exposed of a pipe, which comprises: heating or cooling a pipe, the outer surface of which is not exposed, from the side of the inner surface thereof so that a difference in temperature is produced between a portion of the inner surface of the pipe corresponding to an accumulation of foreign matters or a thinner portion as a defective portion on the outer surface not exposed of the pipe and a portion of the inner surface of the pipe corresponding to a normal portion of the outer surface of the pipe; then shooting the inner surface of the pipe by means of a thermal imaging system while the difference in temperature still remains on the inner 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 on the outer surface of the pipe by means of the thus obtained thermal image.
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Hirashima Toru
Ishida Shunichiro
Ishihara Koji
Koshihara Toshio
Matoba Yuji
NKK Corporation
Yasich Daniel M.
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