An Improved Longitudinal Mode Guided Wave Received Sensor Based on Inverse Magnetostrictive Effect for Open End Pipes
- 63 Downloads
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.
KeywordsImproved received sensor Enhanced signal Inverse magnetostrictive effect Guided wave Open end pipe
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).
- 1.Cawley, P., Lowe, M.J.S., Alleyne, D.N., Pavlakovic, B., Wilcox, P.: Practical long range guided wave testing: applications to pipes and rail. Mater. Eval. 61, 66–74 (2003)Google Scholar
- 2.Rose, J.L.: Ultrasonic guided waves: an introduction to the technical focus issue. Mater. Eval. 61, 65 (2003)Google Scholar
- 4.Kwun, H., Kim, S.Y., Light, G.M.: Improving guided wave testing of pipelines with mechanical attachments. Mater. Eval. 68, 927–932 (2010)Google Scholar
- 9.Wu, Z., Ma, S., Chen, Y., Wang, Y.: Detection and identification of dents in pipelines using guided waves. Mater. Eval. 74, 79–89 (2016)Google Scholar
- 11.Xu, J., Chen, G., Zhou, J.H., Li, Y.: Effect of fatigue damage on the notch frequency of the prestressing strand based on magnetostrictive guided waves. Int. J. Appl. Electrom. 59, 1341–1348 (2019)Google Scholar
- 25.IEEE Standard on Magnetostrictive Materials: Piezomagnetic Nomenclature STD 319-1990; IEEE Std: New York, USA, p. 9 (1991)Google Scholar
- 27.Furlani, E.P.: Formulas for computing the field distributions of cylindrical shells with axial polarization. Int J Appl Electrom 6, 103–111 (1995)Google Scholar