Research On Non-contact Information Interaction Technology Based On Human Communication

As a new type of information interaction technology based on human body media,human communication technology has a wide range of applications in wearable biomedical detection,human-computer interaction,smart home,cloud computing and other fields.This thesis focuses on the research of non-contact information interaction technology based on human communication.Including: Theoretical analysis of human antenna system,finite element modeling,finite element simulation and physical experiment verification,etc.It lays the foundation for the realization of non-contact information interaction based on human communication.The main work of this thesis include:(1)Theoretical analysis of human antenna effect.The human body is equivalent to a cylindrical monopole antenna.Antenna theory was used to establish the model of human body axial current induced by time-horizontally polarized plane electromagnetic radiation.The radiation efficiency and reflection coefficient of the system were determined by the circuit equivalence and analysis of the human body antenna system.Finally,it lays a theoretical foundation for the quantitative analysis of human antenna effect.(2)A finite element model of the human body antenna system was established.A complete human body geometry model with multi-layered tissue media was established.Based on the Cole-Cole formula,the dielectric properties parameters of human tissues(skin,fat,muscle and bone)and organs(heart and gray matter)were determined;A wearable Tshaped human body communication electrode is proposed,and a finite element model of the electrode and human body parasitic impedance is established.In the end,a complete finite element model of the human body antenna system was formed,which lays a foundation for the non-contact information interaction simulation based on human body communication.(3)Based on the HFSS(High Frequency Structure Simulator)electromagnetic simulation software,the finite element simulation of the human body antenna system was implemented.The finite element simulation of electrical parameters such as return loss,input impedance,pattern,and current density of the human body antenna system was completed,and relevant conclusions were obtained.Through the simulation study,the influence of the electrical parameters of the human body antenna system on the parameters of the parasitic impedance ZD and wearable T-shaped electrodes was clearly defined.Finally,it provides the basis for the design of non-contact information interaction system based on human communication.(4)Completed physical communication based non-contact information interaction physical experiment verification.According to the relevant standards of the International Non-Ionizing Radiation Protection Committee,the security of non-contact information interaction based on human communication was analyzed.Physical experiments verify the finite element simulation results of the body antenna system parasitic impedance and wearable T-shaped electrode parameters.The single-frequency signal transmission based on the human body antenna effect was realized.Finally,it lays the experimental foundation for the non-contact information interaction based on human communication in the experiment.