液体中激光等离子体声波声谱特性研究

Spectrum Properties Investigated of Laser-induced Plasma Sound Waves Under Water

对高功率激光与液体物质作用时产生的等离子体声波声谱特性进行了实验研究。采用压电陶瓷(PZT)水听器测量了不同情况下的激光等离子体声波,对采集的信号经过傅立叶变换(FFT)后得到相应的声谱进行频谱分析。结果表明:激光等离子体声波的频谱分布、峰值频率与激光能量、激光在水下的衰减特性和水下环境无关。

The laser-induced plasma sound waves during the high-power laser and matter interaction in liquid are investigated by experiments. By the PZT hydrophone,the laser-induced plasma sound waves at different conditions are measured. And the signals of sound waves are analyzed based on FFT. The investigation results show the distribution of laser-induced plasma spectra and the frequency peak have no relation to the energy of the laser,the attenuatioin properties of the laser underwater and the target underwater.