本文選題：手機輻射 + 人體頭部　； 參考：《云南師范大學(xué)》2013年碩士論文

【摘要】：隨著通信事業(yè)的迅猛發(fā)展和人們生活水平的不斷提高，人們擁有手機的數(shù)量越來越多，手機已經(jīng)成為了一種快速的信息交換工具。然而，，隨著手機的日益普及化，人們越來越關(guān)注當(dāng)手機工作時輻射的電磁波是否會對人體構(gòu)成危害。手機是一種小功率的收發(fā)射機，當(dāng)手機在工作時手機天線距離人體頭部很近，因此頭部處于近區(qū)場和電磁輻射之中。而足夠強的電磁波輻射對頭部組織可能產(chǎn)生熱效應(yīng)和非熱效應(yīng)，從而對人體頭部產(chǎn)生一定的影響。為此，本論文主要研究手機輻射對人體頭部的作用。 本論文主要做了以下幾方面的工作： 首先，利用電磁仿真軟件（HFSS）對偶極子天線進行仿真，同時給出了人體頭部各組織相對介電常數(shù)和電導(dǎo)率隨頻率變化的關(guān)系。 其次，根據(jù)人體生理學(xué)的相關(guān)知識對人體頭部建立三層介質(zhì)模型，然后基于相關(guān)電磁理論推導(dǎo)出三層介質(zhì)的電場強度表達式，通過計算得到人體頭部的三層介質(zhì)的電場強度隨著手機到頭部距離變化的關(guān)系。 再次，闡述電磁輻射與人體的相互作用所引起兩類生物效應(yīng)，一類是熱效應(yīng)，另一類是非熱效應(yīng)。當(dāng)手機工作頻率在900MHz的情況下，我們通過基于Snell定律的電磁計算法計算人體頭部各組織的比吸收率（SAR）。然后，利用HFSS仿真軟件對頭部模型進行仿真及計算出局部的SAR值。 最后，將利用FDTD方法、基于Snell定律的電磁計算法和HFSS仿真軟件計算得到的SAR值進行比較。通過比較可知，盡管利用不同方法得到腦組織的局部SAR值存在一定的差異，但基于這些方法得到的SAR值都是隨著手機與人體頭部距離的增加而減小的。為此，我們提出了一些防范電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.
【學(xué)位授予單位】：云南師范大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：X591

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本文編號：1774109