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XU Bai-qiang, SHEN Zhong-hua, NI Xiao-wu, GUAN Jian-fei, LU Jian. Time-frequency analysis of laser-generated ultrasonic wave in coating-substrate systems[J]. LASER TECHNOLOGY, 2004, 28(6): 609-612.
Citation: XU Bai-qiang, SHEN Zhong-hua, NI Xiao-wu, GUAN Jian-fei, LU Jian. Time-frequency analysis of laser-generated ultrasonic wave in coating-substrate systems[J]. LASER TECHNOLOGY, 2004, 28(6): 609-612.

Time-frequency analysis of laser-generated ultrasonic wave in coating-substrate systems

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  • Received Date: May 07, 2004
  • Revised Date: August 09, 2004
  • Published Date: November 24, 2004
  • Laser induced ultrasonic waves in coating-substrate systems are broadband and dispersive,and multiple propagation modes overlap in time domain.By using time-frequency analysis based on the Wigner-Ville distribution,the characters of modes and energy distribution are obtained after analyzing laser ultrasound signals in the coating-substrate system,which are obtained by means of the finite element method.Furthermore,time-frequency method provides a direct measurement velocity dispersion by delay estimation,whose advantage is that it only needs a single measured signal.
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