用于被动式非接触探测的人体心脏电场分析

基于人体心脏电场的被动式非接触探测技术，具有抗干扰性好、无辐射、隐蔽性好、操作简单等优点.利用传统心脏偶极子模型，由单个心肌细胞推导出了心脏场源电位；建立了心脏-躯干模型和等效阻抗耦合电路模型，得到了心脏电场从体内到体表传输的传递函数和衰减增益；通过对人体躯干点电荷模型进行了分析，得到了人体心脏电场的探测方程，对其进行了仿真分析.由此得出在允许误差范围内，可以将人体心脏电场等效为点电荷电场模型分布，并通过仿真得到了人体心脏电场被动式非接触探测的理论探测距离.

Analysison Human Cardiac Electric Field Applied in Passive Non-Contact Detection

Passive non-contact detection technique based on human heart electric field has many merits, i.e., high anti-interference, no radiation, well-concealment, operation easily and so on. Firstly, we deduced the cardiac source potential from single myocardial cell by the traditional heart dipole model; Secondly, we established the simulations of heart-torso and equivalent impedance coupling circuit to obtain the transfer function and attenuation gain of the cardiac electric field from intra-body to body surface; What is more, we acquired the detection formula of human heart electric field taken from simulation analysis of the electric field detection function for point charge model of torso, respectively. The results indicats that individual cardiac electric field can be equal to the electric field produced by the point charge within the error range. Finally, we obtained the theory detection distance based on the passive non-contact detection of individual cardiac electric field.