Effect of optical penetration on laser generatedthermoelastic ultrasound in solids
Effect of optical penetration on laser generated thermoelastic ultrasound in solids出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)
年 卷 期：1995年第14卷第4期
页 面：289-299页
学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学]
主 题：Laser ultrasonics Thermoelastic generation Optical penetration Directivity
摘 要：The effect of optical penetration on laser thermoelastically-generated ultrasound in non-metallic solids is studied theoretically on the basis of the thermoelastie equations. In one-dimensional model, on the assumption of some finite laser penetration, the general expression of wave displacement is obtaincd by solving the thermal diffusion and thermoelastic displacement equations, from which the influencc of optical absorption on the displacement amplitude is analyzed. In the case of two-dimensional axial symmetry, on neglecting the thermal diffusion, we solve the thermoelastic wave equation by means of the integral transform method and obtain analytic expressions of the wave displacement components in the *** patterns of both longitudinal and shear waves are presented and discussed.
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