激光空泡脉动特性的实验和理论研究  

Experimental and Theoretical Study of the Oscillation of a Laser-Induced Bubble

作　　者：陈笑[1] 徐荣青[1] 沈中华[1] 陆建[1] 倪晓武[1] 

机构地区：[1]南京理工大学应用物理系,江苏南京210094

出　　处：《中国激光》2005年第3期331-335,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金(60208004);江苏省自然科学基金(BK2001056);教育部高校优秀青年教师奖励计划(2002年)资助项目.

摘　　要：采用自行研制的基于光偏转原理的高灵敏度光纤传感器研究了激光在水中铝靶表面产生的等离子体空泡及其脉动特性.通过实验获得了激光等离子体空泡在靶表面两次膨胀收缩的全过程;判定了空泡在两次脉动中对应的最大和最小泡半径.进而结合空泡溃灭理论,推算了激光空泡在各次脉动周期中含气量的变化.实验结果表明,激光空泡的含气量越小,空泡收缩越剧烈,气泡所能收缩的最小泡半径越小,其相应溃灭周期也越短.By means of a high-sensitive fiber-optic sensor based on optical beam deflection, the oscillating property of a laser-induced cavitation bubble in the vicinity of an aluminum target in water is investigated in detail. The characteristic waveforms induced by a cavity during the two oscillating cycles are presented and the corresponding maximum and minimum radii are determined. Furthermore, the variations of the gas content in a cavity at each oscillation are estimated according to the bubble-collapsing theory. The experimental results are shown that the less the remained gas in a cavity, the more violent the cavity contracts, the smaller the corresponding minimum bubble radii and the shorter the oscillating durations are.

关 键 词：激光技术 激光空泡 脉动特性 光纤传感器 

分 类 号：TN247[电子电信—物理电子学]