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利用时域有限差分(FDTD)方法,分别对不同脉冲宽度的超宽谱电磁脉冲在自由空间中的不同长度的细导线上的感应电流进行了计算。计算结果表明:不同脉冲宽度的超宽谱电磁脉冲,在同一根细导线上所感应电流的幅值大小和波形曲线有明显不同,细导线的长度化也会产生类似现象,也就是说超宽谱电磁脉冲在细导线上的感应电流是同时和脉冲宽度和细导线长度相关的,即不同的长度对应不同的易感脉宽,同时这种相关也是有一定的规律可循的。
The time-domain finite difference (FDTD) method was used to calculate the induced currents of the ultra-wide-band electromagnetic pulses with different pulse widths in different lengths of thin wires in free space. The calculation results show that the amplitude and the waveform of the induced current on the same thin wire are obviously different for the ultra-wide-band electromagnetic pulse with different pulse width. The length of the thin wire also produces a similar phenomenon, that is to say, The induced current of the electromagnetic pulse on the fine wire is related to both the pulse width and the fine wire length. That is, the different lengths correspond to different susceptible pulse widths, and the correlation has a certain rule to follow.