| 激光脉冲波形对液体中热膨胀机制致声特性的影响 |
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| 引用本文： | 李秋实,倪明,罗洪,胡永明.激光脉冲波形对液体中热膨胀机制致声特性的影响[J].半导体光电,2010,31(3). |
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| 作者姓名： | 李秋实 倪明 罗洪 胡永明 |
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| 作者单位： | 国防科技大学光电科学与工程学院,长沙,410073;国防科技大学光电科学与工程学院,长沙,410073;国防科技大学光电科学与工程学院,长沙,410073;国防科技大学光电科学与工程学院,长沙,410073 |
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| 摘 要： | 首先阐述了激光与液体媒质作用通过热膨胀机制激发平面光声源的理论;分别针对激光脉冲为正弦波形、三角波形和高斯波形的情况,推导了激光脉冲分别在约束界面和自由界面下产生声脉冲的解析解,然后通过仿真得到了激发声波的光声脉冲剖面和时空分布图;并对比分析了正弦波形、三角波形和高斯波形的激光脉冲分别在约束边界和自由边界下激发声波的峰值声压、光声转换效率和波形等特性.
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| 关 键 词： | 激光致声 热膨胀机制 脉冲波形 光声脉冲剖面 峰值声压 光声转换效率 |
Effects of Laser Pulse Waveform on Characteristic of Acoustic Waves Generated through Thermoelastic Mechanism in Liquid |
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| LI Qiushi,NI Ming,LUO Hong,HU Yongming.Effects of Laser Pulse Waveform on Characteristic of Acoustic Waves Generated through Thermoelastic Mechanism in Liquid[J].Semiconductor Optoelectronics,2010,31(3). |
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| Authors: | LI Qiushi NI Ming LUO Hong HU Yongming |
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| Affiliation: | LI Qiushi,NI Ming,LUO Hong,HU Yongming(College of Optoelectronic Science and Engineering,National University of Defense Technology,Changsha 410073,CHN) |
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| Abstract: | The theory of thermoelastic mechanism for generation of a plane acoustic source by a laser pulse in liquid is elaborated firstly. The analytic solutions of the acoustic pulses induced by laser pulses under the condition of rigid interface and free surface are deduced on the assumption that the laser waveform is sinusoid,triangular and Gaussian pulse respectively. And then the photoacoustic pulse sections and temporal and spatial profiles of the acoustic pulses are obtained through emulation. At last,analyze... |
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| Keywords: | laser generation of acoustic waves thermoelastic mechanism laser pulse waveform photoacoustic pulse section peak strength laser-acoustic conversion efficiency |
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