分析手机辐射对人体头部的影响

发布时间：2018-04-19 17:50

本文选题：手机辐射 + 人体头部　；参考：《云南师范大学》2013年硕士论文

【摘要】：随着通信事业的迅猛发展和人们生活水平的不断提高，人们拥有手机的数量越来越多，手机已经成为了一种快速的信息交换工具。然而，，随着手机的日益普及化，人们越来越关注当手机工作时辐射的电磁波是否会对人体构成危害。手机是一种小功率的收发射机，当手机在工作时手机天线距离人体头部很近，因此头部处于近区场和电磁辐射之中。而足够强的电磁波辐射对头部组织可能产生热效应和非热效应，从而对人体头部产生一定的影响。为此，本论文主要研究手机辐射对人体头部的作用。本论文主要做了以下几方面的工作：首先，利用电磁仿真软件（HFSS）对偶极子天线进行仿真，同时给出了人体头部各组织相对介电常数和电导率随频率变化的关系。其次，根据人体生理学的相关知识对人体头部建立三层介质模型，然后基于相关电磁理论推导出三层介质的电场强度表达式，通过计算得到人体头部的三层介质的电场强度随着手机到头部距离变化的关系。再次，阐述电磁辐射与人体的相互作用所引起两类生物效应，一类是热效应，另一类是非热效应。当手机工作频率在900MHz的情况下，我们通过基于Snell定律的电磁计算法计算人体头部各组织的比吸收率（SAR）。然后，利用HFSS仿真软件对头部模型进行仿真及计算出局部的SAR值。最后，将利用FDTD方法、基于Snell定律的电磁计算法和HFSS仿真软件计算得到的SAR值进行比较。通过比较可知，尽管利用不同方法得到脑组织的局部SAR值存在一定的差异，但基于这些方法得到的SAR值都是随着手机与人体头部距离的增加而减小的。为此，我们提出了一些防范电磁波危害的有效措施。
[Abstract]:With the rapid development of communication industry and the continuous improvement of people's living standards, more and more people own mobile phones, mobile phone has become a rapid information exchange tool.However, with the increasing popularity of mobile phones, people pay more and more attention to whether the electromagnetic waves emitted by mobile phones are harmful to human body.Mobile phone is a kind of low power transmitter. When the mobile phone is working, the antenna of the mobile phone is very close to the human head, so the head is in the near field and electromagnetic radiation.However, strong enough electromagnetic wave radiation may produce thermal and non-thermal effects on the head tissue, thus exerting a certain influence on the human head.Therefore, this paper mainly studies the effect of mobile phone radiation on human head.The main work of this paper is as follows:Firstly, the dipole antenna is simulated by the electromagnetic simulation software (HFSS), and the relationship between the relative dielectric constant and the conductivity of the human head tissues with frequency is given.Secondly, according to the related knowledge of human physiology, a three-layer medium model is established for the human head, and then the expression of electric field intensity of the three-layer medium is derived based on the relevant electromagnetic theory.The relationship between the electric field intensity and the distance from the mobile phone to the head is obtained by calculating the electric field intensity of the three layers of media in the human head.Thirdly, two kinds of biological effects caused by the interaction between electromagnetic radiation and human body are discussed, one is thermal effect, the other is non-thermal effect.When the frequency of mobile phone is 900MHz, we calculate the specific absorptivity of human head tissues by electromagnetic calculation method based on Snell's law.Then, the HFSS simulation software is used to simulate the head model and calculate the local SAR value.Finally, the FDTD method, the electromagnetic calculation method based on Snell law and the SAR value calculated by HFSS simulation software are compared.The comparison shows that although there are some differences in the local SAR values of brain tissue obtained by different methods, the SAR values obtained based on these methods decrease with the increase of the distance between the mobile phone and the human head.Therefore, we put forward some effective measures to prevent the harm of electromagnetic wave.
【学位授予单位】：云南师范大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：X591

【参考文献】