For the space charge measurement method with optical excitation for electrical insulation, the distortion of the excitation laser on the measurement signal and the accumulation of space charge have not been discussed before. Both experiment and simulation results show that three types of distorted components introduced by optical excitation can lead to distortion of the upper interface signal. Further, the factors causing distortion of the measured signal and the formation mechanism are analysed. A virtual electrode potential compensation method and a distorted component extraction method are proposed. Meanwhile, an attenuation restoration and charge conversion correction factor is introduced, leading to a novel signal processing algorithm adapted to space charge optical measurement methods. Compared with the traditional algorithm, the novel algorithm has an error of less than 1% in the calculation of charge and electric field strength, with an increase in accuracy of 47.7% and 9.81%, respectively. By applying the novel restoration algorithm, the comparison shows that the space charge accumulation does not change significantly under laser irradiation, verifying the reliability of the optical excitation. The given algorithm can provide a theoretical and technical foundation for the realisation of the optical measurement method for space charge.

中文翻译：

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开发一种新颖的信号恢复算法，以消除飞秒激光照射激发的空间电荷测量中的失真成分

对于采用光激励电绝缘的空间电荷测量方法，激励激光对测量信号的畸变和空间电荷的积累以前没有讨论过。实验和仿真结果均表明，光激励引入的三种失真分量会导致上界面信号失真。进一步分析了测量信号失真的影响因素及形成机制。提出了虚拟电极电位补偿方法和失真分量提取方法。同时，引入了衰减恢复和电荷转换校正因子，产生了一种适合空间电荷光学测量方法的新型信号处理算法。与传统算法相比，该算法在电荷和电场强度的计算上误差小于1%，精度分别提高了47.7%和9.81%。通过应用新颖的恢复算法，比较表明激光照射下空间电荷积累没有明显变化，验证了光激发的可靠性。所给出的算法可为空间电荷光学测量方法的实现提供理论和技术基础。