液体中激光等离子体声波特性研究

采用压电陶瓷水听器对液体中激光等离子体声波进行了实验研究.利用小波变换对不同激光能量、不同作用金属物质、不同激光波长下检测的声波信号进行了频谱特性分析.结果表明:液体中激光等离子体声波的频率分布范围为0~150 kHz,激光能量、金属物质与激光波长的改变对声波频率范围并没有太大的影响|小波分解后,低频a6级信号的能量占总能量的绝大部分,所占比例随着金属离化能的增加而减少|信号的主要频率成分为0~10 kHz,集中在a6级,峰值频率为5 kHz.

Properties Investigation of Laser-induced Plasma Sound Waves in Liquids

By the piezoelectric transducer hydrophone,laser-induced plasma sound waves in liquids were measured through experiments.Wavelet transform was applied to analyze the spectra characteristics of these signals acquired at different laser energy,different metal solid boundary and different laser wavelength.The results show that laser-induced plasma sound waves frequency range is 0~150 kHz,and changes of the laser energy,the metalboundary underwater and the laser wavelength have little effect on distribution of frequency of waves.Most energy of plasma sound waves is concentrated at the a6 level,and the proportion of the whole energy decreases with the increase of ionization energy of metal.The main frequency of sound waves is within 0~10 kHz,and the frequency peak is 5 kHz.