Optimising ultrasonic wideband Rayleigh wave generation by pulsed electromagnetic coils

被引：12

作者：

Jian, X. ^{[1
]}

Dixon, S. ^{[1
]}

Edwards, R. S. ^{[1
]}

机构：

[1] Univ Warwick, Dept Phys, Ultrason Grp, Coventry CV4 7AL, W Midlands, England

来源：

NONDESTRUCTIVE TESTING AND EVALUATION | 2005年 / 20卷 / 01期

基金：

英国工程与自然科学研究理事会;

关键词：

EMAT; non-contact ultrasound; Rayleigh wave; transient ultrasonic;

D O I：

10.1080/10589750500033988

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Transient ultrasonic Rayleigh wave generation by pulsed electromagnetic coils operating via the Lorentz force mechanism is investigated. Optimal coil design is calculated by considering the entire ultrasonic generation system including the pulse generator, coil shape and size, and the electromagnetic coupling between coil and metal sample. The study is carried out through theoretical modelling and comparison with experimental measurements taken using an 80 MHz bandwidth Michelson laser interferometer as a detector. The time dependent Lorentz force generated by the electromagnetic acoustic transducer (EMAT) is modelled using finite element calculations, and the resultant ultrasonic field is calculated using an efficient numerical algorithm. Excellent correlation is observed between the simulated waveforms and experimental measurements. This demonstrates how the approach reported here will greatly assist in optimising the design of generating EMAT for specific applications.

引用

页码：43 / 62

页数：20

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