论文部分内容阅读
对不同激光参数条件下脉冲光纤激光修锐青铜金刚石砂轮过程中产生的490~600nm波段范围内的等离子体空间分辨发射光谱进行了研究。在局部热力学平衡条件下,根据测得的等离子体谱线信号的相对强度,利用Boltzmann图法和Stark展宽法分别计算得到等离子体电子温度和电子数密度值,并对激光单脉冲能量、距砂轮表面的探测距离等因素对等离子体电子温度和电子数密度的影响进行了研究。实验结果表明,激光修锐产生的等离子体电子温度和电子数密度随探测距离的增加近似呈Lorentz分布,随激光单脉冲能量的变化近似呈指数规律增长。在此基础之上,进一步计算了等离子体逆韧致吸收系数,并总结其随探测距离和激光单脉冲能量的变化规律。
The spatial-resolved plasma emission spectrum of the plasma in the range of 490-600 nm generated by pulsed fiber laser-repaired bronze diamond wheel under different laser parameters was studied. Under the conditions of local thermodynamic equilibrium, the plasma electron temperature and electron density were calculated by Boltzmann plot and Stark broadening respectively according to the relative intensity of the measured signal of the plasma spectrum. The energy of single pulse of laser, The surface of the detection distance and other factors on the plasma electron temperature and electron density effects were studied. The experimental results show that the plasma electron temperature and electron density generated by laser sharpening are approximately Lorentz distribution with the increase of the detection distance, and increase exponentially with the change of single pulse energy. On the basis of this, the inversed absorption coefficient of the plasma is further calculated, and its variation with the detection distance and the laser single pulse energy is summarized.