太阳电池阵静电放电脉冲电流及其辐射信号特性的研究
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摘要
研究太阳电池阵静电放电的时域和频域特征,为掌握太阳电池阵充放电形成机制提供依据。静电放电地面模拟试验在SCF-900航天器带电地面综合模拟试验装置中完成,通过电子辐照方法进行太阳电池阵静电放电试验。试验中将太阳电池阵结构与真空室地隔离,利用电子枪模拟GEO轨道最坏空间带电环境,通过电子枪辐照样品表面使其充电,当积累电子产生的负电位超过太阳电池材料的电压击穿阈值时,在电池阵表面会发生静电放电。利用电流探头CT-2(1mV/1mA)、单极子天线和数字存储示波器Terk DPO4104(带宽1GHz,采样频率5GHz)来测量电流、电场并记录其波形。太阳电池阵表面充电静电电位是产生静电放电的放电源,放电过程中激发出脉冲宽度为几μs的瞬态放电电流,产生的脉冲电流峰-峰值幅度为几安培到十几安培,波形是幅度逐渐衰减的振铃波。太阳电池阵静电放电辐射场持续时间几百ns至几个μs的瞬态信号,辐射场强度为几千V/m,其频谱覆盖了零到几百MHz的范围。太阳电池阵静电放电太阳电池阵静电放电的时域特征表现为脉冲群,信号波形具有陡峭的前沿,频率范围主要集中在0~50MHz之间。该结论对于实测航天器静电放电信号特征具有重要的参考价值。
To study the characteristics of time and frequency domain of solar arrays during electrostatic discharge,to improve the understanding as well as technical support on charge-discharge mechanism of solar arrays.Electrostatic discharge ground simulation was conducted in an electrified synthesis facility of SCF-900 by a test of electron irradiation on solar arrays.In the test,the main structure of solar arrays was isolated from the ground of vacuum chamber and electron gun was used to simulate the electrified environmental extremes in the geostationary earth orbit.Specimens was electronically irradiated and charged by the electron gun.Electrostatic discharge was observed on the solar array surface once the negative potential of solar array caused by accumulated electrons exceeded its voltage breakdown threshold.Devices were used to record the current strength and shape as well as the electrical field,including the monopoles,the CT-2 current detectors(1mv/m A)and the Terk DPO4104 digital storage oscilloscope(bandwidth 1GHz and sampling frequency 5GHz).Electrostatic discharge was initiated by the electrostatic potential of surface charged solar arrays.A transient current was activated during the discharge and its pulse width is 10~(-6)s.A degraded ring-wave current was observed and the detected pulse peak ranged from several to dozen amperes.The solar arrays electrostatic discharge field sustains from 10~(-7) to 10~(-6)s.The irradiation field strength was 10~3V/m and the spectrum ranged up to 10~2MHz.A pulse cluster was characterized for the solar arrays time domain,showing a steep-front,the frequency ranged from 0-50MHz.Such results is valuable for the physical testing on the spacecraft electrostatic discharge signals.
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