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激光诱导环氧玻璃钢等离子体电子密度测量
Electron density measurement of laser-induced epoxy fiber reinforced polymer plasma
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摘要: 利用马赫曾德尔干涉测量系统采集到等离子体的激光干涉图像。为了提高数据处理的精度，应用了改进的数字式二次曝光傅里叶法从干涉图中获取了初始的缠绕相位，并采用改进的基于掩膜与枝切法的相位解缠算法对缠绕相位进行相位解缠。在对解缠相位做 Abel 逆变换后，得到了不同延时时刻下激光诱导环氧玻璃钢等离子体电子密度的空间分布。结果显示：测量得到的电子密度主要为1018 cm－3数量级。实验表明，在记录的时间范围内激光等离子体的电子总数变化不大，且电子密度的变化与等离子体体积的变化大致成反比。Abstract: Interferograms of laser-induced epoxy fiber reinforced polymer plasmas are obtained through a Mach-Zehnder interferometry system.An improved digital double-exposure Fourier method is applied to extract initial wrapped phases from interferograms,and then an improved phase unwrapping algorithm based on a mask and a branch-cut method is proposed to solve the problem of phase unwrapping.After the inverse Abel transfor-mation of the unwrapped phase,spatial distributions of the electron density of laser-induced epoxy fiber rein-forced polymer plasma at various delays are acquired.Results show that the measured electron density of the plasma is mainly distributed on the order of 10 18 cm-3 .The experiment also indicates that the total amount of laser plasma electrons changes slightly within the recorded time and the change of the electron density is approx-imately inversely proportional to the change of the plasma volume.
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