A new magnetic configuration for a small in-plane electromagnetic acoustic transducer applied to laser-ultrasound measurements: Modelling and validation

被引：62

作者：

Dutton, B ^{[1
]}

Boonsang, S ^{[1
]}

Dewhurst, RJ ^{[1
]}

机构：

[1] Univ Manchester, Manchester M60 1QD, Lancs, England

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 2006年 / 125卷 / 02期

关键词：

EMAT; magnetostatic modelling; laser ultrasound; non-contact sensors;

D O I：

10.1016/j.sna.2005.07.026

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

This paper presents an enhanced in-plane electromagnetic acoustic transducer (EMAT) for detecting laser-generated ultrasound. Instead of using post-processing of numerical data to enhance signal-to-noise, the paper describes a new EMAT design to increase the magnetic flux density applied to the sample. The EMAT's magnetic flux density was modelled in 3D using a finite element software to predict new magnetic spatial field distributions. A configuration was found to increase the flux density by a factor of 1.8 +/- 0.2, compared to magnetic configurations previously used in conventional designs. Field predictions were implemented and confirmed experimentally. As a consequence, laser-ultrasound Rayleigh waves have been used to validate the performance of this sensor system. It was found that the EMAT's in-plane sensitivity increased by a factor of 2.0 +/- 0.2. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：249 / 259

页数：11

共 34 条

[1] Hybrid laser/broadband EMAT ultrasonic system for characterizing cracks in metals [J].