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Coding methods for low power laser generation of ultrasound

Cleary, A. and Veres, I.A. and Thursby, G.J. and McKee, C. and Pierce, S.G. and Culshaw, B. (2009) Coding methods for low power laser generation of ultrasound. In: 2010 Review of Progress in Quantitative Nondestructive Evaluation, 2010-07-26 - 2010-07-31.

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Abstract

We describe how the application of maximum-length sequence (m-sequence) coding can be used to improve the measured signal-to-noise ratio of ultrasonic waves generated by a low power laser diode. Lamb waves were generated in thin metallic plates using a pulsed excitation. To improve the signal-to-noise ratio of the detected signal, various signal processing methods have been evaluated, with m-sequences described here. We also show how the spectral content of the ultrasonic wave can be controlled by using a modified m-sequence approach