Low peak-power laser ultrasonics
Low peak-power laser ultrasonics
复制标题
低峰值功率激光超声波
DOI:
10.1080/10589759.2011.573549
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发表时间:
2011
影响因子:
2.6
通讯作者:
Pierce S
中科院分区:
文献类型:
--
作者:
Pierce S
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 104W 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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影响因子:
4.1
作者:
C. Swift;S. Pierce;B. Culshaw
通讯作者:
B. Culshaw
影响因子:
2.4
作者:
J. Vollmann;J. Dual
通讯作者:
J. Dual
DOI:
10.1109/t-uffc.1986.26871
发表时间:
1986
期刊:
IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control
影响因子:
--
作者:
A. Mandelis
通讯作者:
A. Mandelis
DOI:
10.1063/1.3362405
发表时间:
2010
期刊:
ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing
影响因子:
--
作者:
S. Sharples;Wenqi Li;M. Clark;M. Somekh
通讯作者:
M. Somekh
影响因子:
2.6
作者:
M. Potter;S. Dixon
通讯作者:
M. Potter;S. Dixon