非金属固体中高斯光束热弹超声的方向性研究

应用科学学报 ›› 1998, Vol. 16 ›› Issue (1): 68-73.

非金属固体中高斯光束热弹超声的方向性研究

吴亚平, 是度芳, 贺渝龙

华中理工大学

收稿日期:1996-07-29 修回日期:1996-12-27 出版日期:1998-03-31 发布日期:1998-03-31
作者简介:吴亚平:讲师,华中理工大学物理系,武汉 430074

Study on the Directivity of Gauss Beam Generated Thermoelastic Ultrasound in Non-Metallic Solids

WU YAPING, SHI DUFANG, HE YULONG

Huazhong University of Science and Technology Wuhan 430074

Received:1996-07-29 Revised:1996-12-27 Online:1998-03-31 Published:1998-03-31

摘要/Abstract

摘要： 该文从理论上研究了非金属固体材料受高斯光束热弹激励时所产生的超声波的方向性.通过积分变换法求解热弹性运动方程,推导出远场区中的位移解析表达式,给出了纵波和横波的方向性图案,讨论了材料的光吸收系数对声源方向性的影响,并与实验结果进行了比较.

关键词: 激光超声, 相对光吸收系数, 方向性

Abstract: The directivity of Gauss beam generated ultrasound in non-metallic solids are stutied theoretically. We solve the thermoelastic wave equations by means of the integral transform mathod and obtain analytic expressions of the wave displacements in the far-field. We also present directivity patterns of both longitudinal and shear waves, discuss the effects of optical absorption coefficient on the diretivity of the ultrasound waves and compare them with the experimental results.

Key words: directivty, laser generated ultrasond, relative optical absorption coefficient

吴亚平, 是度芳, 贺渝龙. 非金属固体中高斯光束热弹超声的方向性研究[J]. 应用科学学报, 1998, 16(1): 68-73.

WU YAPING, SHI DUFANG, HE YULONG. Study on the Directivity of Gauss Beam Generated Thermoelastic Ultrasound in Non-Metallic Solids[J]. Journal of Applied Sciences, 1998, 16(1): 68-73.