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概要

Various energy plants use a large number of important equipment and structural members that are continuously operated in a high temperature range exceeding 500 ° C. Monitoring and evaluating their remaining life is an important issue that is directly linked to plant safety and economic efficiency. Non-destructive inspection plays an important role in non-destructively evaluating the soundness of structures and the materials that compose them. Therefore, we have developed a non-destructive inspection system for a high-temperature pipe that uses a long waveguide so that the sensor unit can be implemented in a room temperature environment and uses guided waves propagating in the axial direction. This paper refers to the structure of an electromagnetic acoustic transducer for a Lamb wave and an SH-plate wave attached on a long waveguide, the configuration method of the waveguide, and the detection results of any scratches. 

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