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概要

This paper reports research activities in the authors’ group to develop a novel non-destructive testing method using a microwave to quickly inspect the inner surface of a pipe. The method propagates a microwave inside a pipe to detect anomalies appearing the inner surface on the basis of the reflection of the microwave due to the anomalies. Because the method does not require probe scanning unlike conventional non-destructive testing methods such as eddy current testing, it can inspect a long pipe quite quickly. Experimental verification using a brass tube with an inner diameter of 19 mm and a length of 31 m showed clear signals due to artificial wall thinnings 6, 9, and 17 m away from the end of the pipe where a probe to propagate microwave was attached.

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