雷电电磁脉冲电场仪的标定研究

为了给出雷电电磁脉冲电场仪测试结果的实际量值,拟采用实验室已有的有界波模拟器,以雷击浪涌发生器产生的1.2/50 μs脉冲电压作为激励源,对电场仪进行标定。为此,通过实验和数值仿真分析了有界波模拟器的有关性能。实验结果表明:在标定时可去除模拟器的终端匹配器。从计算结果可见:电场仪屏蔽壳体会扰动被测电场,使周围电场有所增大,这样的扰动可模拟实测时的情况,标定时可不予考虑;而当电场仪的高度超过有界波模拟器工作空间高度的1/3时,会对工作空间场分布产生较大影响,故在标定中要设法避免。

Standardization of LEMP electric field instrument

In order to give the actual value of lightning electromagnetic pulse(LEMP) electric field instrument testing results, this paper plans to complete electric field instrument standardization with laboratory bounded wave simulator, which is stimulated by lightning surge generator with 1.2/50 μs pulse voltage. It analyzes performances of the simulator through experiment and numerical simulation as well. Experimental results show that the simulator terminal matcher can be removed. Numerical simulation results show that the instrument shielded enclosure may disturb the electric field and make it bigger, but this can be ignored in the real situation. However, if the instrument exceeds one-third of the simulator working place in height, it will greatly affect the inner field distribution, which should be avoided in standardization.