Enhancement of the signal strength for longitudinal guided wave sensors using the magnetic concentrator

Issue title: Proceedings from the 16th International Symposium on Applied Electromagnetics and Mechanics (ISEM 2013)

Guest editors: Xavier Maldague and Toshiyuki Takagi

Article type: Research Article

Authors: Sun, Pengfei^a | Wu, Xinjun^a | Xu, Jiang^{a; *}

Affiliations: [a] School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, China | Université Laval, Canada | Tohoku University, Japan

Correspondence: [*] Corresponding author: Xinjun Wu, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China. Tel.: +86 27 8755 9332; Fax: +86 27 8755 9332; E-mail: xinjunwu@mail.hust.edu.cn

Abstract: For the ultrasonic guided wave testing technology based on the magnetostriction effect, the structure of the sensor has a significant influence on its detectability. A structure for enhancing the received signal strength by encircling a magnetic concentrator around the coil is studied in this work. Based on theoretical analysis, influences of the magnetic permeability of the magnetic concentrator and the electrical conductivity on the signal strength are analyzed. Experiments are presented to verify the analysis.

Keywords: Guided wave, longitudinal mode, sensor, magnetic concentrator, pipe inspection

DOI: 10.3233/JAE-141832

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 45, no. 1-4, pp. 211-217, 2014