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Report No.

Study on pipe health monitoring method by hybrid measurement using electromagnetic ultrasonic

Tagawa, Akihiro ; Kojima, Fumio*

The purpose of this study is to develop a hybrid sensor to be able to measure two or more physical values with one sensor with an electromagnetic acoustic transducer. Each result of a measurement can improve the measurement precision by doing working that calibrate each other. The piping surface temperature was measured by converting the direct current resistance at the temperature by using the EMAT coil. As a result, it was confirmed that coefficients of determination reproduced by the accuracy of 0.99 or more and it was in the proportion the temperature and resistance. It was confirmed the amount of the pipe wall thinning is to be able to measure the board thickness of the piping of 10 mm at 200 $$^{circ}$$C by using the pulse echo method and the pulse echo resonance method. Water temperature was calculated by using the distance between EMATs which carried out opposite arrangement and ultrasonic time of concentration.



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