发明名称 |
METHOD AND APPARATUS FOR DETECTING DEFECTIVE PORTION ON OUTER SURFACE NOT EXPOSED OF PIPE |
摘要 |
METHOD AND APPARATUS FOR DETECTING DEFECTIVE PORTION ON OUTER SURFACE NOT EXPOSED OF PIPE 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. |
申请公布号 |
CA1306776(C) |
申请公布日期 |
1992.08.25 |
申请号 |
CA19890593025 |
申请日期 |
1989.03.07 |
申请人 |
NKK CORPORATION |
发明人 |
KOSHIHARA, TOSHIO;HIRASHIMA, TORU;OKAMOTO, HARUHITO;ISHIHARA, KOJI;ISHIDA, SHUNICHIRO;MATOBA, YUJI |
分类号 |
G01N25/72 |
主分类号 |
G01N25/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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