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

Graham Thursby; Borja Sorazu; Daniel Betz; Brian Culshaw

doi:10.1117/12.600545

9 May 2005 Novel methods of Lamb wave detection for material damage detection and location

Graham Thursby, Borja Sorazu, Daniel Betz, Brian Culshaw

Proceedings Volume 5768, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV; (2005) https://doi.org/10.1117/12.600545
Event: Nondestructive Evaluation for Health Monitoring and Diagnostics, 2005, San Diego, CA, United States

Abstract

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 polarization 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 S₀ and A₀ modes can also vary. This can be of interest because, for instance, the A₀ 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.

Citation Download Citation

Graham Thursby, Borja Sorazu, Daniel Betz, and Brian Culshaw "Novel methods of Lamb wave detection for material damage detection and location", Proc. SPIE 5768, Health Monitoring and Smart Nondestructive Evaluation of Structural and Biological Systems IV, (9 May 2005); https://doi.org/10.1117/12.600545

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