本文關(guān)鍵詞：隨年齡變化的生物組織介電特性的數(shù)值模擬與研究　出處：《蘭州交通大學(xué)》2016年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 生物介電特性 四階Cole-Cole模型 數(shù)值模擬 電磁劑量學(xué) 手機(jī)電磁輻射

【摘要】：目前已有的對(duì)青少年及嬰幼兒在手機(jī)輻射等電磁暴露下的安全評(píng)估中采用的是大都是成年人的生物組織介電特性數(shù)據(jù),這給電磁暴露評(píng)估結(jié)果帶來(lái)一定的誤差。由文獻(xiàn)可知豬的生物組織介電特性與人的相似度較高,本課題以豬的生物組織測(cè)量數(shù)據(jù)為基礎(chǔ),分別確立幼年、青少年、成年三個(gè)年齡段人體組織的四階Cole-Cole模型參數(shù),設(shè)計(jì)了手機(jī)天線(xiàn)并進(jìn)行人頭在手機(jī)輻射下的電磁暴露安全評(píng)估。具體包含如下內(nèi)容:(1)介紹了生物介電特性的理論研究及實(shí)驗(yàn)測(cè)量的研究歷史。詳細(xì)闡述了生物介電弛豫和色散特性、微觀及宏觀極化機(jī)制及描述生物介電特性的常用數(shù)學(xué)模型。(2)鑒于最小二乘法良好的擬合特性及牛頓迭代法收斂速度快的特點(diǎn),采用最小二乘法與牛頓迭代法相結(jié)合的方法,對(duì)三個(gè)年齡段豬的15種組織的介電實(shí)驗(yàn)數(shù)據(jù)進(jìn)行擬合,得到了不同年齡段四階Cole-Cole模型擬合參數(shù);由于豬的組織介電特性與人的相似度較高,不同年齡段豬的生物組織介電特性測(cè)量數(shù)據(jù)所確立的四階Cole-Cole模型參數(shù)可用于預(yù)測(cè)不同年齡段人的組織介電參數(shù);對(duì)比分析了不同年齡段組織介電特性的差異與擬合參數(shù)的差異。(3)設(shè)計(jì)了中心頻率為835MHz的平面倒F天線(xiàn)。以經(jīng)典三層球模型作為頭模型,計(jì)算了三個(gè)年齡段的頭部組織在同一頻率下的介電參數(shù),對(duì)手機(jī)輻射下人頭的SAR值進(jìn)行了計(jì)算,對(duì)比分析了計(jì)算結(jié)果。表明:三個(gè)年齡段下人頭在手機(jī)輻射下的SAR值均在規(guī)定安全范圍內(nèi),但隨著年齡的減小,人頭吸收手機(jī)電磁輻射的能量會(huì)增加。因此,兒童更應(yīng)注意避免長(zhǎng)時(shí)間暴露在電磁輻射環(huán)境中。
[Abstract]:At present, the data of dielectric properties of biological tissues, which are mostly adults, have been used in the safety assessment of adolescents and infants under electromagnetic exposures such as mobile phone radiation. According to the literature, we know that the dielectric properties of pig's biological tissue and the similarity between human and human are very high. Based on the measurement data of pig's biological tissue, we establish the infant separately. Parameters of fourth-order Cole-Cole model of human tissue in adolescents and adults of three ages. The antenna of mobile phone is designed and the electromagnetic exposure of human head under the radiation of mobile phone is evaluated. The theoretical study and experimental measurement of biological dielectric properties are introduced, and the characteristics of biological dielectric relaxation and dispersion are described in detail. The microscopic and macroscopic polarization mechanism and the mathematical model commonly used to describe the biological dielectric properties.) in view of the good fitting characteristics of the least square method and the fast convergence rate of Newton iterative method. Using the least square method and Newton iteration method, the dielectric data of 15 kinds of tissues in three age pigs were fitted. The fitting parameters of four-order Cole-Cole model with different ages were obtained. Because of the high similarity between the tissue dielectric properties of pigs and human beings. The parameters of the fourth-order Cole-Cole model established by measuring the dielectric properties of biological tissues in pigs of different ages can be used to predict the tissue dielectric parameters of people of different ages. A planar inverted F antenna with a central frequency of 835 MHz was designed and compared with the difference of dielectric properties and fitting parameters of different age groups. The classical three-layer spherical model was used as the head model. The dielectric parameters of the head tissue of three age groups were calculated at the same frequency, and the SAR value of the human head was calculated under the radiation of mobile phone. The results of comparison and analysis show that the SAR of human head under the radiation of mobile phone is within the prescribed safe range under the three age groups, but decreases with the age. The human head absorbs the cell phone electromagnetic radiation energy will increase. Therefore, children should pay more attention to avoid prolonged exposure to electromagnetic radiation environment.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：R594.8

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