人体对电磁脉冲吸收剂量的仿真研究

Specific absorption and currents induced in human body for exposure to electromagnetic pulses

在对39种人体组织的复介电常数进行二阶德拜式拟合的基础上,基于分辨率为3×3×3mm的人体结构模型,采用与频率相关的时域有限差分法((FD)2TD),对两种电磁脉冲作用下局部比吸收能量和感生电流密度分布进行了计算分析。结果表明,人体内局部比吸收能量和感生电流密度分布与入射电磁脉冲的频谱特性密切相关。在两种电磁脉冲作用下,人体全身平均比吸收能量分别为0.0138PJ/kg和0.0340PJ/kg。

The exposure of a human body in the far field of electromagnetic pulse sources is studied. The （FD）^2TD method is employed together with an anatomical based model of human body with resolution of 3 × 3 × 3mm. The complex permittivities ε^＊ （τ） of 39 tissues are described by best-fit second-order Debye equations over the band of incident EMP＇s. Local specific absorptionand SA（r） and induced current density J（r） inside the human body are calculated for exposure to two EMP＇s. The results show that the spatial distribution of SA （r） and Jpeak （r） are markedly affected by frequency spectra of EMP＇s. The whole body average specific absorptions SAWB are calculated to be 0. 0138 PJ/kg and 0. 0340 PJ/kg respectively.