水下等离子体声源脉冲放电光谱测量与分析

本文采用HR4000CG-UV-NIR光纤光谱仪和NI-PCB压力传感器测量了水下等离子体声源脉冲放电光谱和强声波的压力幅值,分析了声与光之间的能量转换关系,并重点观察了不同放电参数对光谱特征的影响。实验结果表明,等离子体声源脉冲放电光谱为连续谱,能量主要集中在500 nm左右的谱段;放电产生的光能量和声波能量相互竞争,具有此消彼长的关系;提高放电电压,减小电极间隙距离可以提高光的辐射强度和半峰值谱宽度;增大电极间隙距离,将使发光能量向远紫外区移动;更换电极材料将明显改变光的谱分布和强度变化。

Spectrum Measurement and Analysis of Underwater Plasma Acoustic Source Pulse Discharge

In this paper, we experimentally tested the opto-spectrum output and the pressure amplitude of intensive acoustic wave by HR4000CG-UV-NIR spectrometer and NI-PCB sensor, analyzed the energy transformation relationship of sound and light, and observed the influence of discharge parameters on the opto-spectrum. The experimental results indicate that the spectrum of the light is of continuous spectrum and its dominant energy is around 500 nm. The light energy output and sound energy output compete with each other. If we raise the discharge voltage and reduce the gap distance of electrode tips, the spectrum amplitude and its half peak width will increase. If we increase the gap distance, the light energy will spread to the far ultraviolet zone. And if we change the steel tip with copper tip, the spectrum energy distribution and amplitude will change.