Abstract
The magnetostrictive guided wave technology is widely applied to inspect pipes. In the meantime, there are many open end pipes need to be tested rapidly. When we studied the lift-off effect of receiving longitudinal mode guided waves in pipes based on the inverse magnetostrictive effect, we found that the rate of change of the magnetic flux in the air and in the pipe wall is the same order of magnitude, but opposite. According to this phenomenon, an improved magnetostrictive guided wave received sensor for open end pipes is provided. Compared with the traditional sensor, the improved sensor includes not only an outside coil and a bias coil but also an inside coil and an accessory structure. The enhanced signal only including the pipe wall is obtained by subtracting the inside coil signal from the outside coil signal. A prototype sensor that can obtain the enhanced signal is developed. The experimental results show that the improved sensor signal’s amplitude increases by more than 50% than the traditional sensor and the noise is almost changeless. The application of the received sensor will help to improve the defect detection capabilities for pipes. However, the sensor could only be applied to inspect the open end pipes.
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This work was supported by the National Natural Science Foundation of China (Grant No. 51575213), the National Key Research and Development Program of China (Grant No. 2016YFC0801904).
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Xu, J., Hu, C. & Ding, J. An Improved Longitudinal Mode Guided Wave Received Sensor Based on Inverse Magnetostrictive Effect for Open End Pipes. J Nondestruct Eval 38, 83 (2019). https://doi.org/10.1007/s10921-019-0621-6
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DOI: https://doi.org/10.1007/s10921-019-0621-6