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Low power laser generated ultrasound : signal processing for time domain data acquisition

Cleary, A. and Veres, Istvan and Thursby, G.J. and McKee, C. and Armstrong, I. and Pierce, S.G. and Culshaw, B. (2010) Low power laser generated ultrasound : signal processing for time domain data acquisition. In: Laser Ultrasonics 2010, 2010-07-05 - 2010-07-08, Bordeaux, France.

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Abstract

The use of low power modulated laser diode systems has previously been established as a suitable method for non-destructive laser generation of ultrasound. Using a quasi-continuous optical excitation amplified by an erbium-doped fibre amplifier (EDFA) allows flexible generation of ultrasonic waves, offering control of further parameters such as the frequency content or signal shape. In addition, pseudo-random binary sequences (PRBS) can be used to improve the detected impulse response. Here we compare two sequences, the m-sequence and the Golay code, and discuss the advantages and practical limits of their application with laser diode based optical excitation of ultrasound.

Item type: Conference or Workshop Item (Paper)
ID code: 27793
Keywords: ultrasonics, lasers, ultrasound, low power, laser generated ultrasound, signal processing, time domain, data acquisition, Electrical engineering. Electronics Nuclear engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Depositing user: Dr Graham Thursby
Date Deposited: 01 Nov 2010 14:06
Last modified: 15 Apr 2015 10:08
URI: http://strathprints.strath.ac.uk/id/eprint/27793

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