9.5 m高水平极化有界波电磁脉冲模拟器内场分布特性的初步实验研究

Preliminary experimental investigation of field distribution characteristics in horizontally polarized bounded-wave EMP simulator with 9.5 m in height

测量了9.5 m高的水平极化有界波电磁脉冲模拟器的内部场,并根据实验测量结果分析了该模拟器内场分布特性,包括一定区域内场均匀性的定量分析及模拟器内部有效测试空间的确定方法,进而对最低位置为距离地面2 m的有效测试空间进行了预估。实验结果表明:位于该模拟器双锥中心正下方且距离该中心5.5~7.5 m的测点场的峰值基本按照测点与双锥中心间距的倒数衰减,且随着测点与双锥中心间距的增大,因锥与极板不连续结构导致的波形变化在时间轴上滞后,而因地面影响导致的波形变化在时间轴上提前;在距离地面比较高的水平面上,两极板之间场的外泄方向场的衰减比双锥中轴线方向场的衰减更慢;该模拟器内部距离地面2 m的水平面上12 m×12 m的区域内所取测点的归一化场平均峰值约为0.678,归一化场平均峰值的标准偏差约为0.0689,场的均匀性约为2.039 dB。

The electric field in a horizontally polarized bounded-wave electromagnetic pulse(EMP)simulator with 9.5 m in height are got by experimental measurement.The study of field distribution characteristics in the simulator based on the field,including the quantity analysis of the field uniformity in some domain and the method for defining the effective testing space in the simulator,is given.The domain of an effective space with the lowest horizontal plane 2 m away from the ground is estimated.The experimental results show that,the peak-value of the electric field of the testing point right under the bicone’s center with a distance of 5.5−7.5 m decreases inversely with the distance between the testing point and the bicone’s center.The effect of the discontinuous configuration of the bicone and the plane on the electric field in time domain of the testing points under the center is slower as the distance increases,but the influence of the ground on the field is quicker;The field along the leakage direction of the field in the simulator decreases more slowly than those along the bicone’s symmetric axis,as the testing-points located at a horizontal plane far away from the ground;The mean value of the normalized electric field in 12 m×12 m domain on the horizontal plane 1 m away from the ground in the simulator is 0.678,the corresponding standard deviation is 0.0689,and the field uniformity is 2.039 dB.