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为了有效评估B型地铁车载双八木天线对地铁司机射频电磁场暴露的安全性,利用3维电磁仿真软件构建了在双八木天线辐射下的地铁司机室射频电磁环境模型。通过设计司机室、车载双八木天线和司机人体模型,数值模拟了天线在不同输入功率条件下对司机人体模型的射频电磁场暴露影响。仿真结果表明,当地铁实际运行时的天线输入功率达到最大值200 m W时,人体模型中质量为10 g的任意相邻组织内的平均比吸收率(specific absorption rate,SAR10 g)的峰值为0.018 649 W/kg,电场强度的峰值为16.201 V/m,磁场强度的峰值为0.176 16 A/m,峰值皆出现在躯干组织中,且都低于国际非电离辐射委员会(International Commission on Non-Ionizing Radiation Protection,ICNIRP)制定的职业电磁暴露限值,说明司机在此射频电磁场暴露环境中是安全的。分层头模型的仿真结果表明,平均比吸收率在大脑组织中的穿透深度大于电场强度和磁场强度。
In order to effectively evaluate the safety of BIGUAR B-type radio on the radio frequency electromagnetic field exposure of subway drivers, a three-dimensional electromagnetic simulation software was used to build the radio frequency electromagnetic environment model of the subway cab under the radiation of double Yagi antenna. Through the design of the driver’s cab, double Yagi antenna and the driver’s human body model, the effects of the antenna on the RF electromagnetic field exposure of the driver’s human body model are numerically simulated under different input power conditions. The simulation results show that the peak value of the specific absorption rate (SAR10 g) in any adjacent tissue with a mass of 10 g in the human body model when the input power of the antenna reaches 200 mW in the actual operation of the subway is 0.018 649 W / kg, the peak value of electric field intensity was 16.201 V / m and the peak value of magnetic field intensity was 0.176 16 A / m, both of which peaked in the trunk tissues and were lower than those of the International Commission on Non- Ionizing Radiation Protection, ICNIRP), indicating that drivers are safe in this RF EMF exposure environment. The simulation results of layered head model show that the average specific absorption rate in brain tissue is greater than the penetration depth of electric field and magnetic field.