A Longitudinal Mode Electromagnetic Acoustic Transducer (EMAT) Based on a Permanent Magnet Chain for Pipe Inspection

被引：27

作者：

Cong, Ming ^{[1
]}

Wu, Xinjun ^{[1
]}

Qian, Chunqiao ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, Sch Mech Sci & Engn, Wuhan 430074, Peoples R China

来源：

SENSORS | 2016年 / 16卷 / 05期

关键词：

longitudinal mode; pipe inspection; EMAT; permanent magnet chain; defect detection; MAGNETOSTRICTIVE PATCH TRANSDUCERS; GUIDED-WAVE INSPECTION; EXCITATION EFFICIENCY; ARRAY; GENERATION; COIL; ENHANCEMENT; REFLECTION; SENSOR; LINE;

D O I：

10.3390/s16050740

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A new electromagnetic acoustic transducer (EMAT) design, employing a special structure of the permanent magnet chain, is proposed to generate and receive longitudinal guided waves for pipe inspection based on the magnetostriction mechanism. Firstly, a quantitative analysis of the excitation forces shows the influence of the radial component can be ignored. Furthermore, as the axial component of the static magnetic field is dominant, a method of solenoid testing coils connected in series is adopted to increase the signal amplitude. Then, two EMAT configurations are developed to generate and receive the L(0,2) guided wave mode. The experimental results show the circumferential notch can be identified and located successfully. Finally, a detailed investigation of the performance of the proposed EMATs is given. Compared to the conventional EMAT configuration, the proposed configurations have the advantages of small volume, light weight, easy installation and portability, which is helpful to improve inspection efficiency.

引用

页数：18

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