| The human body is a common source of EMR,and the physiological state of the human body affects the EMR characteristics of the human body to a certain extent.By looking for the correlation between the EMR characteristics of the human body and the physiological state of the human body,the physiological state of the human body can be extrapolated from the EMR characteristics of the human body.This has important theoretical significance and wide application prospects in the medical field.A large number of sweat ducts are distributed on the surface of the human skin,and the conductive sweat in the sweat duct can generate high frequency current.The physiological state of the human body affects the parameters of the sweat duct,so the EMR characteristics of the sweat duct reflect the physiological state of the human body to a certain extent.In this thesis,through the establishment of sweat duct model on the surface of the human skin,the changes in the EMR characteristics of sweat duct when the physiological state of the human body changes are simulated and analyzed,the correlation between the human body physiological state and the EMR characteristics of sweat duct is studied,the theoretical basis and application foundation for the study of the human body EMR characteristics are provided.The main work of the thesis is as follows:(1)Based on the structure of the skin and sweat duct,the basic equivalent model of sweat duct helical antenna is established in the HFSS electromagnetic simulation software by using the antenna principle and electromagnetic wave theory.The frequency distribution characteristics of the sweat duct are simulated in the frequency range of 30MHz～10THz,and it is found that the basic equivalent model of sweat duct has radiation peaks at 70 GHz,300GHz,420 GHz,700GHz,810 GHz and other frequency points.The radiation direction characteristics and radiation field strength distribution characteristics of the sweat duct are simulated on typical frequency points of the peak radiation points within the frequency range of 30MHz～1THz,and the changes of sweat duct inner diameter and conductivity are used to simulate the change of human body physiology state,and the effect of the sweat duct parameters on the EMR characteristics of sweat duct is obtained by simulation.It is found that the change of the sweat duct inner diameter can affect the frequency of the peak radiation point,and the change of the sweat duct conductivity can affect the radiationstrength of the sweat duct at radiation peak point.(2)According to the distribution density of sweat duct,the equivalent models of multiple sweat ducts are established.The frequency distribution characteristic of three and sixteen sweat ducts equivalent models within the frequency range of 30MHz～10THz are simulated respectively.The radiation direction characteristics and radiation field strength distribution characteristics of three and sixteen sweat ducts equivalent models are simulated on typical frequency points within the frequency range of 30MHz～1THz.By comparing the radiation characteristics of several sweat duct equivalent models,it is found that the mutual coupling of the sweat ducts will cause the peak frequency of the sweat duct radiation to shift to a low frequency to a certain extent,and the sweat duct will have stronger radiation in the axial direction.(3)Through the analysis of the influence of sweat duct parameters on the EMR characteristics of sweat duct,combined with the differences in the frequency distribution characteristics of several sweat duct equivalent models,the frequency range suitable for studying the correlation between the human physiological state and the EMR characteristics of sweat duct is obtained,this frequency range is 55GHz～67GHz,403GHz～408GHz,670GHz～690GHz and 770GHz～790GHz,respectively.In this thesis,the research on the EMR characteristics of sweat duct has great reference significance for the research of human body EMR and non-contact sensors. |
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