论文部分内容阅读
800 mm芯径低氢氧根光纤传输自由运转钬激光脉冲爆炸式汽化光纤端面的水形成汽化泡,汽化泡闭合时会辐射振荡波信号。不同激光参数条件下汽化泡形貌和运动状态有差异,导致辐射振荡声波的个数、强度、谐振周期、声学频率等特性参数不同。为研究不同脉宽对声信号的影响,搭建了声信号测量系统,通过示波器分析计算振荡波声学信号特征参数。结果表明电源电压为1000 V、频率为5 Hz、电源脉宽为0.7~1.6 ms的条件下,随着脉宽增加,声压值整体上先升高但存在多个拐点,达到峰值1.01 MPa后呈现下降趋势,但第一个声学信号频率总体呈下降趋势且最大值为400 Hz。高能量、短脉宽的钬激光脉冲能诱导高强度、多个数、短周期、高频率的振荡波信号。
800 mm core diameter of low-OH fiber transmission Free-running holmium laser pulse Explosive vaporized fiber end of water to form vaporization bubble, vaporization bubble closed when the oscillation of the oscillation wave signal. Different laser parameters under the conditions of vaporization bubble morphology and movement are different, resulting in the number of radiation oscillations of the sound waves, intensity, resonance period, acoustic frequency and other characteristics of different parameters. In order to study the influence of different pulse width on the acoustic signal, an acoustic signal measurement system is set up, and the characteristic parameters of the acoustic signal of the oscillatory wave are calculated and analyzed by the oscilloscope. The results show that with the increase of the pulse width, the sound pressure value firstly increases but the number of inflection points increases with the supply voltage of 1000 V, the frequency of 5 Hz and the power pulse width of 0.7-1.6 ms. After reaching the peak value of 1.01 MPa Showing a downward trend, but the overall first acoustic signal frequency downward trend and the maximum value of 400 Hz. High energy, short pulse width of holmium laser pulse can induce high intensity, multiple number, short cycle, high frequency oscillation wave signal.