LEO航天器太阳电池阵激光诱导电弧放电试验与分析

Laser-induced Arc Discharge Experiment and Analysis of LEO Spacecraft Solar Array

基于太阳电池阵空间电弧放电理论,对纳秒脉冲激光诱导太阳电池阵电弧放电机理进行分析,采用空间放电模拟试验系统,试验研究了低地球轨道(LEO)等离子体环境下纳秒脉冲激光诱导太阳电池阵电弧放电的功率密度阈值及其放电特性。试验结果表明:LEO等离子体环境下激光诱导太阳电池阵电弧放电的功率密度阈值约为1.08×10^(8)W/cm^(2),与无激光诱导相比,放电持续时间增加了20%,且每施加1次纳秒脉冲激光诱导电弧放电概率约为60%。对比分析不同工况下的太阳电池阵损伤效应可得:纳秒脉冲激光诱导电弧放电破坏绝缘层最严重,容易造成太阳电池阵中部分PN结短路失效,其损坏程度远远大于空间环境太阳电池串间电弧放电烧蚀损坏效应和盖玻片表面热应力损伤造成的PN结断路失效。此结论可为航天器太阳电池阵放电试验的措施及试验参数选取提供参考。

Based on the space arc discharge theory of solar array,the mechanism of nanosecond pulse laser-induced arc discharge of solar array is analyzed.The power density threshold and discharge characteristics of nanosecond pulse laser-induced arc discharge of solar array in LEO(low earth orbit)plasma environment are experimentally studied by using space discharge simulation experiment system.The results indicate that the power density threshold of laser-induced solar array arc discharge in the LEO plasma environment is about 1.08×108 W/cm 2.Compard with no laser-induced discharge,the discharge duration has increased by 20%,and the probability of discharge induced by each nanosecond pulse laser application is about 60%.By comparing and analyzing the damage effects of solar array under different working conditions,it can be concluded that nanosecond pulse laser-induced arc discharge destroys the insulation layer most seriously,which is easy to cause partial PN junction short circuit failure in solar cells.The damage degree is far greater than that of discharge ablation damage effect between strings in the space environment and the PN junction open circuit failure caused by thermal stress damage on cover glass surface.This conclusion can provide a reference for measures and parameters for discharging tests of spacecraft solar array.