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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。
The laser interferometric image of the plasma was acquired using the Mach-Zehnder interferometry system. In order to improve the accuracy of data processing, an improved digital double exposure Fourier method was used to obtain the initial phase of the entanglement from the interferogram. An improved phase unwrapping algorithm based on mask and branch method was used to determine the phase of the entanglement Phase unwrapping. After the Abel inverse transformation was carried out on the unwrapped phase, the spatial distribution of laser-induced electron density of glass fiber reinforced epoxy under different delay time was obtained. The results show that the measured electron density is mainly 1018 cm -3. Experiments show that the total number of electrons in the laser plasma changes little in the recorded time range, and the change of the electron density is approximately inversely proportional to the change of the plasma volume.