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Vol. 165, Issue 2, February 2014, pp. 189-194

 

Bullet

 

Study on Propagation Characteristics of Ultrasonic Guided Wave for EMAT Sensor
 

1 Songsong LI and 2 Xiaoming CHEN

1 Dalian Ocean University, Heishijiao, Dalian, 116023, China
2 Dalian University of Technology, Rd 2# Linggong, 116024, China
2 Tel.: 86-411-84706660, fax: 86-24-84706660

2 E-mail: chen_xm@dlut.edu.cn

 

Received: 19 February 2014 /Accepted: 26 February 2014 /Published: 28 February 2014

Digital Sensors and Sensor Sysstems

 

Abstract: Guided wave technology using Electromagnetic Acoustic Transducer has the advantages of withstand high sensitivity, low attenuation, quickly and efficiently detection etc. To effectively detect the defects, it is necessary to study the propagation characteristics of guided wave. In this paper, the dispersion and multimode characteristics of guided waves are studied by the disperse simulation software, and the variation rule of propagation is analyzed by the geometric parameters of plate and pipe. The results show that the dispersion characteristics of guided wave are depended on the material, the thickness and inner diameter, and it is better at lower frequencies and smaller thickness. This is helpful to the selection of excitation mode, operating frequency and transducer structure parameter.

 

Keywords: Dispersion characteristics, Guided wave, Lamb wave, Electromagnetic ultrasonic, Nondestructive testing.

 

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