engleski

Electromagnetic Modelling of the Human Body Exposed to Extremely Low Frequency (ELF) Electromagnetic Field

Analytical approximation of the human body exposed to extremely low frequency electromagnetic radiation is presented in this thesis. The equations for calculating electric and magnetic fields emitted by three-phase, three-wire power line, configuration of which is used by Croatian electro-distribution company, are outlined. Later calculations are performed with these results. Techniques for measurements of low frequency electric and magnetic fields are presented, with the description of the latest measuring instruments. Guidelines and standards in protection against harmful exposure to electromagnetic fields are presented, with the emphasis on ICNIRP guidelines. Main part of the thesis is dealing with analytical approximations of the human body. Cylindrical approximation is based on a theory of receiving antenna and presentation of the human body as a parasitic antenna exposed to an incident electric field. Through cylindrical approximation, the induced current inside the human body is calculated. This current is used for evaluating adverse health effects that electric field has on the human body. Different cases of exposure are considered, taking into account insulation between human body and the earth. Ellipsoidal approximation is used as a comparison to cylindrical. Finally, the comparison with the numerical model is made. Numerical model is based on Boundary Element Method (BEM) and the results obtained are shown to be in very good agreement. The comparison with the ICNIRP guidelines and the Croatian law for protection from non-ionizing radiation is made and it is shown that all of the acquired results are well bellow all limitations.

Human Body Modelling; Extremely Low Frequency Electric Field; Analytical Approach; Cylindrical Approximation; Ellipsoidal Approximation; Boundary Element Method

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