激光等离子体声信号特性 |
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引用本文: | 卢志刚,战仁军,王晓宇.激光等离子体声信号特性[J].红外与激光工程,2014,43(9):2844-2848. |
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作者姓名: | 卢志刚 战仁军 王晓宇 |
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作者单位: | 1.武警后勤学院军交运输系,天津300309; |
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基金项目: | 国家自然科学基金(51109217,51209210) |
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摘 要: | 为了对激光等离子体声信号特性进行深入研究,构建了激光声实验系统。使用波长1.06 mNd:YAG 脉冲激光聚焦击穿水介质产生激光等离子体声信号,使用水听器对信号进行接收,通过高速摄像机对信号产生过程进行了记录。分析了激光等离子体声信号的时频域特征。从理论上研究了激光等离子体声信号的指向性和传输特性,并进行了实验验证。研究结果表明:激光等离子体声信号时域脉宽为15 s 左右,频带宽度为200 kHz,主频在70 kHz 左右。信号在不同传输角度上的幅度差异很小,按照近似1/r 的规律衰减,传输过程中主频逐渐减小。
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关 键 词: | 激光等离子体声信号 光致击穿 激光光学 水下声波 |
收稿时间: | 2014-01-21 |
Characteristics of laser-induced plasma acoustic signal |
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Affiliation: | 1.Military Transportation Department,Logistics University of CAPF,Tianjin 300309,China;2.Institude of Equipment Engineering,Engineering University of CAPF,Xi'an 710086,China;3.Department of Electronic Engineering,Naval University of Engineering,Wuhan 430033,China |
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Abstract: | The experimental system for laser -induced acoustic signals had been built for research on characteristic of laser-induced plasma acoustic signals. Acoustic signals were produced by pulsed laser focusing into water. A hydrophone was used to receive the acoustic signals. A high speed camera was used to record the breakdown procession. Time and frequency domain of laser-induced plasma acoustic signals were studied. Its directivity and transmission characteristic were analyzed theoretically, and proven by experiment. The results are as follows: The pulse width of laser-induced plasma acoustic signals is about 20 s, its frequency width is 500 kHz and main frequency is 70 kHz. It transmits in all directions and decreases proportionally to 1/r, main frequency decreases as distance increases. |
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