Novel methods of Lamb wave detection for material damage detection and location

被引：8

作者：

Thursby, G ^{[1
]}

Sorazu, BA ^{[1
]}

Betz, D ^{[1
]}

Culshaw, B ^{[1
]}

机构：

[1] Univ Strathclyde, Dept Elect & Elect Engn, Glasgow G1 1XW, Lanark, Scotland

来源：

Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV | 2005年 / 5768卷

关键词：

ultrasound; damage detection; fibre Bragg gratings; polarimetric sensing;

D O I：

10.1117/12.600545

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

We describe and compare two novel methods of detecting ultrasonic Lamb waves used for damage detection and location, and then go on to compare their characteristics with those of more conventional PZT transducers. The two methods are measurements of the change in polarisation state of the light in an optical fibre and the changes in reflected power from a fibre Bragg grating. Since different transducers measure different properties of Lamb waves by different methods, their relative sensitivities to the S-0 and A(0) modes can also vary. This can be of interest because, for instance, the A(0) mode is more sensitive to the presence of delaminations in a sheet due to the larger shear strain component that this mode contains. We also describe the directional properties of the sensors and demonstrate the ways in which these can be used to advantage in the detection and location of damage.

引用

页码：313 / 322

页数：10