人体吸收电磁能量与入射方向和极化的关系

本文讨论了用时域有限差分法计算在平面电磁波照射下人体对电磁能量的吸收问题。计算了各种入射方向和极化条件下非均匀块状人体模型中的局部比吸收率(SAR)分布。计算结果表明,人体并不总是在正面入射时吸收能量最多;同时还表明,局部比吸收率比平均比吸收率更值得重视,因为局部吸收率的最大值往往比全身平均值大几倍到十几倍。本文的计算结果丰富了人们在人体电磁剂量学方面的知识。

THE RELATIONSHIP BETWEEN THE EM ENERGY ABSORPTION OF HUMAN BODY AND THE INCIDENT DIRECTION AND POLARIZATION OF PLANE WAVE

The problems of EM energy absorption of human body irradiated by plane wave are discussed by using the Finite-Difference Time-Domain (FD-TD) method. The local SAR (Specific Absorption Rare), the whole-body-averaged SAR and the layer-averaged SAR for the inhomogenous block model of human body with different incident direction and different polarization of the incident waves are calculated. The results show that the appearance of maximum EM energy absorption is not always at the situation of the front incidence and the local SAR b more important for the interaction of the EM fields with human body. All results provide more information about the electromagnetic dosimetry for human body.