摘要
应用一维热传导方程和Navier-Stokes(N-S)方程,采用简化的正弦脉冲波形模型对激光激发产生的应力脉冲进行了理论研究,分别得出了弱吸收试样表面是钳紧或自由情况下超声应力脉冲的表达式。结果表明,正弦脉冲模型与目前所采用的模型具有相同的结论,超声应力脉冲极值的幅度取决于试样的光学、热学特性和厚度,更加接近真实的skew-Gaussian激光脉冲,且更具有普遍性。
Making use of one dimension heat exchange and Navier-Stokes（N-S） equations, the stress pulse that is brought by laser is researched by using simplification sinusoid pulse model, gxperssions of the stress pulse are attained,whose sample is feeble absorbability and its surface is free or tightened. The results show the sinusoid pulse model and the popular model have the same conclusion,and the extent of ultrasound stress pulse depends on the optical and thermal characteristics and thickness of the sample. Also it is much closer to true skew-Gaussian laser pulse,and it shows universality.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2007年第4期498-500,共3页
Journal of Optoelectronics·Laser
关键词
激光超声
热弹效应
高斯激光脉冲
热传导
laser ultrasound
thermoclastic effect
Gauss laser pulse
thermal diffusion
