Abstract
The nondestructive inspection of a high temperature structure is required to guarantee its safety. However, there are not any useful sensors for high temperature structures. Some of them cannot work at temperatures over 50°C. Another concern is that they are too expensive to use. The sensing system, which can transmit and receive an ultrasonic wave that travels a long distance using a long waveguide, has been studied. We could confirm that an optimal guided ultrasonic wave can travel more than 50cm using a thin 2mm diameter bar as the waveguide. However, we had a difficult problem of receiving a reflected ultrasonic wave from the bottom surface of a test specimen. We tried to improve the trial inspection system using an ultrasonic horn. Finally, an experiment in which the temperature of a test block was heated to about 270°C has been done and the reflected ultrasonic wave from the bottom surface was successfully detected.
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