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采用积分变换技术求解热弹体运动方程和热传导方程耦合问题,得到脉冲激光线源热弹激励时气-固界面波法向位移解的积分表达式。解析计算被积函数极点留数,并采用FFT技术得到气-固界面波声场的瞬态位移波形。实验在脉冲激光器与激光干涉仪等组成的激光超声系统上进行。将脉冲激光聚焦成线源激励空气-铁界面,采用激光干涉仪成功检测到气-固界面Leaky Rayleigh波和Scholte波。数值与实验结果有很好的一致性。
Integral transformation technique was used to solve the coupled problem of equations of motion and equation of thermal conduction. The integral expression of the normal displacement solution of gas-solid interface wave was obtained when the pulse laser source was operated by thermo-elastic excitation. Analyze and calculate the pole residue of the integrand, and use the FFT technique to obtain the transient displacement waveform of the gas-solid interface wave sound field. The experiments were performed on a laser ultrasound system consisting of a pulsed laser and a laser interferometer. The pulsed laser was focused on a linear source to excite the air-iron interface, and the laser-interferometer was used to successfully detect the gas-solid interface Leaky Rayleigh and Scholte waves. Numerical and experimental results are in good agreement.