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Low peak-power laser ultrasonics

Pierce, Stephen and Cleary, Alison and Veres, Istvan and Culshaw, Brian and Thursby, Graham and Mckee, Campbell and Swift, C. and Armstrong, Ian (2011) Low peak-power laser ultrasonics. Nondestructive Testing and Evaluation, 26 (3-4). pp. 281-301.

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Abstract

Techniques for the successful excitation of guided ultrasonic waves using a low peak-power laser ultrasonic source are discussed and compared with more conventional Q-switched laser sources. The paper considers acoustic propagation in thin plates, in which the frequencies used, typically only the fundamental guided wave modes, are considered. Aspects of excitation and detection geometry are considered along with the physical mechanisms of photo-acoustic generation and the practical issues surrounding available source wavelengths and power outputs. Understanding of the effects of these constraints is critical for the successful application of the technique. Continuous wave excitation and fully arbitrary modulation schemes are compared, and a technique to control the bandwidth of Golay code modulation is introduced. It is shown that earlier work by the authors was capable of guided wave detection at peak-power densities of 104 W cm− 2. Later work has focussed on the use of erbium-doped fibre amplifiers combined with Golay code modulation to improve the recovered signal-to-noise ratio. Two key applications of the techniques are considered: material properties measurements (using inversion of dispersion curve data) and acoustic emission system calibration.

Item type: Article
ID code: 35354
Keywords: ultrasonics, lasers, laser ultrasonics, ultrasonic waves, Electrical engineering. Electronics Nuclear engineering, Physics and Astronomy(all), Mechanics of Materials, Materials Science(all), Mechanical Engineering
Subjects: Technology > Electrical engineering. Electronics Nuclear engineering
Department: Faculty of Engineering > Electronic and Electrical Engineering
Technology and Innovation Centre > Sensors and Asset Management
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 29 Oct 2011 05:20
    Last modified: 28 Mar 2014 05:44
    URI: http://strathprints.strath.ac.uk/id/eprint/35354

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