| 金刚石压砧加载下激光超声的有限元模拟 |
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| 引用本文： | 冯文,杨德兴,廖威,郭钰宁. 金刚石压砧加载下激光超声的有限元模拟[J]. 中国激光, 2011, 0(8) |
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| 作者姓名： | 冯文 杨德兴 廖威 郭钰宁 |
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| 作者单位： | 西北工业大学理学院陕西省光信息技术重点实验室教育部空间应用物理与化学重点实验室; |
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| 摘 要： | 采用有限元方法(FEM)建立了金刚石压砧(DAC)加载下脉冲激光激发超声波的数值分析模型。数值模拟了高压下样品中的瞬态温度场和超声位移场,得到了激光垂直照射下入射点异侧不同位置处的超声波波形,分析了超声位移场随时间变化的特征。结果表明,在DAC加载下,热弹作用产生的超声波具有明显的指向性,其纵波能量主要集中于激光入射方向附近,而横波的能量集中于偏离激光入射点30°～55°的倾角之间。上述特征与自由面热弹作用结果差异很大,而与自由面烧蚀作用结果相似。
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| 关 键 词： | 激光技术 激光超声 位移场 金刚石压砧 有限元方法 |
Numerical Simulation of Laser Induced Ultrasonic in a Diamond Anvil Cell by Finite Element Method |
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| Feng Wen Yang Dexing Liao Wei Guo Yuning. Numerical Simulation of Laser Induced Ultrasonic in a Diamond Anvil Cell by Finite Element Method[J]. Chinese Journal of Lasers, 2011, 0(8) |
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| Authors: | Feng Wen Yang Dexing Liao Wei Guo Yuning |
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| Abstract: | A numerical simulation model for a pulsed laser induced ultrasonic in a diamond anvil cell(DAC) is established by using finite element method(FEM).The transient temperature field and ultrasonic displacement field in sample under high pressure are simulated.Ultrasonic waveforms at different positions in the rear face of sample under the irradiation of a vertically incident laser pulse are obtained,and the characteristics of ultrasonic displacement field changing with time are analyzed.The numerical results s... |
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| Keywords: | laser technique laser ultrasonic displacement field diamond anvil cell finite element method |
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