双人体耦合心电场被动式人体静电探测器中的电旋转效应分析

The Electrorotation Effect of Passive Electrostatic Detection System for Double Human Body Coupling Heart Electric Field

静电探测器是通过检测目标的静电场而获得目标信息的探测器,利用静电场原理对目标进行探测的人体探测器是人体探测技术的重要应用。本文重点讨论利用介电泳技术对双人体耦合心电场的探测问题,并对电旋转检测效应进行分析与仿真。首先阐述了电旋转效应原理;其次分析了双人体耦合心电场特性及该电场中弧形四项检测电极的电场,并计算与之对应的介电泳力与转矩;最后利用有限元方法对检测电场及介电泳力进行建模与仿真。仿真结果清晰展示了3种特殊角度下的电旋转效应,与理论分析相一致。

Electrostatic human body detector is a detector which is able to obtain the target information through catching up the electrostatic field of the target. It plays an important role in the human body detection technology. Based on dielectrophoresis theory, the detection of the coupling heart electric field between the oPerator and the detected living human is focused on; in the meanwhile, the electrorotation effect involving this problem is analyzed. Firstly, the electrorotation effect, which belongs to dielectrophoresis theory, is described. Then, the double human body coupling heart electric field and the electrorotation four-pole arch electrode structure which generates detective electric field, are analyzed. Finally, the finite element method is used to simulate and calculate the detective electric field. Simulation result clearly demonstrates electrorotation effect at three special angles. The conclusion is consistent with the theory and is one of significant studies on the passive electrostatic human body detection technique.