Thermal measuring and testing – Leak or flaw detection – With heating or cooling of specimen for test
Patent
1988-08-08
1989-12-12
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
048863700
ABSTRACT:
A method for detecting a state of a substance existing in a pipe, the outer surface of which is exposed, which comprises: 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 a portion of the inner surface thereof, which is in contact with a solid or liquid substance existing in the pipe, and a portion of the outer surface of the pipe corresponding to a portion of the inner surface thereof, which is not in contact with the substance; 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 a state of the substance existing in the pipe by means of the thus obtained thermal image.
REFERENCES:
patent: 3504524 (1970-04-01), Maley
patent: 3566669 (1971-03-01), Lawrence et al.
patent: 4395380 (1983-07-01), Rosh
McLaughlin, P. V. et al., "Non-Destructive Examination of Fibre Composite Structures by Thermal Field Techniques", NDT International, Apr. 1980, pp. 56-62.
Koshihara Toshio
Misawa Rokurou
Sagawa Yuzo
Takehara Kimio
Cuchlinski Jr. William A.
Gutierrez Diego F. F.
NKK Corporation
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