瞬态电磁场三维时域有限差分模拟研究

该文使用三维时域有限差分方法对在不同环境中的0.1~0.1T Hz电磁波场进行数值模拟。以高斯脉冲作为源电流信号研究了导电全空间中电偶极子场，并对海底低阻地质模型的电磁响应做了模拟计算；对隧道含水裂缝异常的回线源瞬变电磁响应进行了分析；对超宽带穿墙探测模型做了模拟计算，进一步在超宽带电磁波与窄带电磁波对钢筋混凝土的探测模拟结果做了对比分析；用FDTD-PIC软件对94 GHz折变回旋振荡管TE6，2模产生过程做了模拟计算，指出模拟中存在的问题，最后对时域有限差分程序的并行做了分析，提出用时域有限差分方法研发回旋管瞬态场三维模拟软件的思路。

On Simulation of 3D-FDTD for Transient Electromagnetic Field

Numerical simulations of electromagnetic field of 0.1-0.1T Hz in different circumstance are carried out with 3D-FDTD (three-dimensional finite-difference time-domain). Electric dipole field in the whole conductive space of sea is presented and electromagnetic response of the seabed geological model of low impedance is simulated taking Gauss impulse as current source. Then, transient electromagnetic response of water-filled cracks abnormal in the tunnel to loop-source is analyzed. UWB (Ultra wideband) through-wall detection model is simulated and calculated, and the simulation results of reinforced concrete detection with UWB electromagnetic wave and narrow-band electromagnetic wave are analyzed and compared. More than that, activation of TE6, 2 in line-joint cavity of 94 GHz gyrotron oscillator is modeled with MAGIC, and the problems existing in the simulation are presented. Finally, we give a deep analysis on the parallel computing of FDTD program and the idea to develop gyrotron three-dimensional transient field simulation software by using FDTD.