| THE CHARACTERISTICS OF LASER GENERATED ULTRASOUND IN SOLIDS |
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| 作者姓名： | Wu Yaping He Yulong Shi Dufang |
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| 作者单位： | Wu Yaping;He Yulong;Shi Dufang，Department of Physics，Huazhong University of Science and Technology，Wuhan 430074，China |
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| 摘 要： | The laser generated ultrasound in solids in a thermoelastic regime is studied by solvingthermoelastic wave equations. Analytic expressions of two-dimensional far-field ultrasonic displace-ments including the effects of thermal diffusion and optical penetration were obtained by means of theintegral transform method. The meaning of the expressions is discussed. The effects of optical absorp-tion coefficient on the directivity of laser generated ultrasound in non-metallic solids are also discussed.The directivity patterns of both longitudinal waves and shear waves are presented.
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| 收稿时间： | 15 April 1997 |
THE CHARACTERISTICS OF LASER GENERATED ULTRASOUND IN SOLIDS |
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| Wu Yaping,He Yulong,Shi Dufang,.THE CHARACTERISTICS OF LASER GENERATED ULTRASOUND IN SOLIDS[J].Acta Mechanica Solida Sinica,1997,10(3):189-197. |
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| Authors: | Wu Yaping He Yulong Shi Dufang |
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| Institution: | (1) Department of Physics, Huazhong University of Science and Technology, 430074 Wuhan, China |
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| Abstract: | The laser generated ultrasound in solids in a thermoelastic regime is studied by solving thermoelastic wave equations. Analytic expressions of two-dimensional far-field ultrasonic displace- ments including the effects of thermal diffusion and optical penetration were obtained by means of the integral transform method. The meaning of the expressions is discussed. The effects of optical absorp- tion coefficient on the directivity of laser generated ultrasound in non-metallic solids are also discussed. The directivity patterns of both longitudinal waves and shear waves are presented. |
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| Keywords: | laser generated ultrasound the effect of thermal diffusion the effect of optical penetration directivity relative depth of optical penetration |
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