摘要
从热传导和热弹性方程出发，理论上研究了在热弹性范围内，固体受激光照射时激励出的超声波场．通过积分变换得到包含热扩散效应和光穿透效应在内的二维远场超声位移的解析表达式，并进行了分析．讨论了在非金属中光穿透对超声场指向性的影响，给出了其纵波和横波的各种方向性图案．
The laser generated ultrasound in solids in the region of thermoelasticity was studied by solving thermoelastic wave equations. Analytic expressions of two dimension ultrasound displacements including the effects of thermal diffusion and optical penetration in farfield were obtained by means of the integral transform method. The meaning of the expressions was discussed. The effects of optical absorption coefficient of the materials on the directivity of laser generated ultrasound in nonmetallic solids were also discussed. The directivity patterns of longitudinal waves and shear waves have been presented.
出处
《固体力学学报》
CAS
CSCD
北大核心
1997年第4期283-289,共7页
Chinese Journal of Solid Mechanics
关键词
激光超声
热扩散效应
光穿透效应
热弹性
laser generated ultrasound, the effect of thermal diffusion, the effect of optical penetration, directivity, relative depth of optical penetration
