Laser induced ultrasonic phased array using full matrix capture data acquisition and total focusing method

Stratoudaki, Theodosia and Clark, Matt and Wilcox, Paul D. (2016) Laser induced ultrasonic phased array using full matrix capture data acquisition and total focusing method. Optics Express, 24 (19). pp. 21921-21938. ISSN 1094-4087 (https://doi.org/10.1364/OE.24.021921)

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Abstract

Laser ultrasonics is a technique where lasers are employed to generate and detect ultrasound. A data collection method (full matrix capture) and a post processing imaging algorithm, the total focusing method, both developed for ultrasonic arrays, are modified and used in order to enhance the capabilities of laser ultrasonics for nondestructive testing by improving defect detectability and increasing spatial resolution. In this way, a laser induced ultrasonic phased array is synthesized. A model is developed and compared with experimental results from aluminum samples with side drilled holes and slots at depths of 5-20 mm from the surface.

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