摘要
建立了激光声实验测量系统,利用脉冲激光聚焦击穿水介质产生声信号。由水听器将声信号转换成电信号并送入数字存储示波器,计算出声信号能量。对不同激光能量、激光聚焦位置和水体盐度下的光声能量转换效率进行了理论和实验研究。研究结果表明:随着激光能量的提高,能量转换效率逐渐减小;激光垂直水面入射时,随着激光聚焦深度的增加,能量转换效率会出现一次阶跃式变大,随后逐渐降低;等离子体对激光能量的吸收越充分,能量转换效率越高;水体盐度的变化对能量转换效率影响很小。
An experiment system for laser-induced acoustic signal has been built. Acoustic signal is induced by pulse laser focused into water. A hydrophone is used to receive and convert acoustic signal into electric signal The energy of the acoustic sig- nal is calculated. Laser acoustic energy conversion efficiency is theoretically and experimentally analyzed. The results are as fol- lows： as laser energy increases, energy conversion efficiency decreases; the longer distance the laser travels before being focused, the smaller the energy conversion efficiency is; energy conversion efficiency increases as absorbed energy by plasma increases; wa- ter salinity has little influence on energy conversion efficiency.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2013年第3期579-582,共4页
High Power Laser and Particle Beams
基金
国家高技术发展技术项目
装备预研基金项目
关键词
激光技术
激光声
光击穿
光声能量转换效率
声信号
laser technology
laser induced acoustic signals
optical breakdown
laser acoustic energy conversion effi- ciency
acoustic signals
