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概要

Pipe wall thinning was evaluated quantitatively by using time domain measurement of Position of pipe wall thinning was evaluated quantitatively by using time domain measurement of microwaves, and the influence of the measurement sensitivity due to the frequency band of microwaves was investigated. Microwave signals having different frequency bands of 10MHz to 40GHz and 10MHz to 67GHz were transmitted from the terminal o f a straight line copper pipe, and the change in the response of the reflected signals was measured. By selecting the narrower frequency band, the measurement noises were alleviated, and the reflected signals at the both ends of the wall thinning were detected successfully. It was found that the position and length of the wall thinning could be evaluated with higher precision by selecting the appropriate frequency band.

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