Low peak-power laser ultrasonics

Stephen Pierce, Alison Cleary, Istvan Veres, Brian Culshaw, Graham Thursby, Campbell Mckee, C. Swift, Ian Armstrong

Research output: Contribution to journalSpecial issue

4 Citations (Scopus)

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.
LanguageEnglish
Pages281-301
Number of pages21
JournalNondestructive Testing and Evaluation
Volume26
Issue number3-4
Early online date13 Jul 2011
DOIs
Publication statusPublished - 2011

Fingerprint

Guided electromagnetic wave propagation
ultrasonics
Ultrasonics
Modulation
modulation
Lasers
Acoustics
lasers
Q switched lasers
acoustic propagation
Erbium doped fiber amplifiers
thin plates
Ultrasonic waves
wave excitation
acoustic emission
ultrasonic radiation
Acoustic emissions
erbium
excitation
continuous radiation

Keywords

  • ultrasonics
  • lasers
  • laser ultrasonics
  • ultrasonic waves

Cite this

Pierce, Stephen ; Cleary, Alison ; Veres, Istvan ; Culshaw, Brian ; Thursby, Graham ; Mckee, Campbell ; Swift, C. ; Armstrong, Ian. / Low peak-power laser ultrasonics. In: Nondestructive Testing and Evaluation. 2011 ; Vol. 26, No. 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.",
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Pierce, S, Cleary, A, Veres, I, Culshaw, B, Thursby, G, Mckee, C, Swift, C & Armstrong, I 2011, 'Low peak-power laser ultrasonics' Nondestructive Testing and Evaluation, vol. 26, no. 3-4, pp. 281-301. https://doi.org/10.1080/10589759.2011.573549

Low peak-power laser ultrasonics. / Pierce, Stephen; Cleary, Alison; Veres, Istvan; Culshaw, Brian; Thursby, Graham; Mckee, Campbell; Swift, C.; Armstrong, Ian.

In: Nondestructive Testing and Evaluation, Vol. 26, No. 3-4, 2011, p. 281-301.

Research output: Contribution to journalSpecial issue

TY - JOUR

T1 - Low peak-power laser ultrasonics

AU - Pierce, Stephen

AU - Cleary, Alison

AU - Veres, Istvan

AU - Culshaw, Brian

AU - Thursby, Graham

AU - Mckee, Campbell

AU - Swift, C.

AU - Armstrong, Ian

PY - 2011

Y1 - 2011

N2 - 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.

AB - 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.

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KW - lasers

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