Adapting the full matrix capture and the Total Focusing Method to laser ultrasonics for remote non destructive testing

Theodosia Stratoudaki, Matt Clark, Paul Wilcox

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

Abstract

Laser Induced Phased Arrays (LIPAs) use post processing to focus and steer the generated ultrasonic beam, synthesizing a phased array. Their principle is based on laser ultrasonics where lasers are used to generate and detect ultrasound. The technique is broadband, non-contact, and couplant free, making LIPAs suitable for large stand-off distances, inspection of components of complex geometries and hazardous environments. Our motivation is to demonstrate remote, non destructive testing with improved image quality, using this technique. LIPAs will be presented that are synthesized by capturing the Full Matrix (FMC), a data acquisition method where all possible transmitter receiver combinations in the array are obtained, at the nondestructive, thermoelastic regime. The Total Focusing Method (TFM) is used as the imaging algorithm, where the captured signals are summed with the appropriate time delay, in order to synthesize a focus at every point in the imaging area. The aim of our presentation is to adapt the FMC and the TFM, which have been previously developed for conventional ultrasonic transducers, to the needs of LIPAs in order to enable fast imaging and make more efficient use of the information in the data.

Original languageEnglish
Title of host publication2017 IEEE International Ultrasonics Symposium, IUS 2017
PublisherIEEE Computer Society
ISBN (Electronic)9781538633830
DOIs
Publication statusPublished - 31 Oct 2017
Event2017 IEEE International Ultrasonics Symposium, IUS 2017 - Washington, United States
Duration: 6 Sep 20179 Sep 2017

Conference

Conference2017 IEEE International Ultrasonics Symposium, IUS 2017
CountryUnited States
CityWashington
Period6/09/179/09/17

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