准静态近似条件下电流耦合型人体通信模型的建立与验证

Construction and Validation of Galvanic Coupling Human Intra-body Communication Model with Quasistatic Approximation

目的建立准静态近似条件下电流耦合型人体通信的电磁理论模型,并验证模型的正确性。方法以人体前手臂为研究对象,讨论人体组织在电流耦合型人体通信过程中满足准静态近似的条件,并由麦克斯韦方程推导出电磁模型的解析解;进而选用圆柱形火腿肠作为实验模拟对象,验证模型的正确性。结果构建了准静态近似条件下人体通信的电磁模型,模型计算值与试验测值间偏差不超过10%;描绘出人体模型在贴附有环形电极的情况下,直径切面的电位分布及衰减情况。结论得到了电流耦合型人体通信在满足准静态近似条件下的电磁理论模型,为人体通信技术提供了初步的理论依据。

Objective To establish intra-body communication （IBC） model with quasi-static approximation and validate its correctness. Methods The quasi-static approximation conditions of human tissues were discussed. Based on the Maxwell Equations, the model of galvanic coupling IBC was developed analytically. It was assumed that the human forearm was equal to column with a pair of ring electrodes. Sausage column was selected to be the experimental object for validating the correctness of the model. Results Galvanic coupling IBC model was established. The deviation of model calculated results from test measured potentials was less than 10% , and the correlation coefficient was more than 0. 998. The potential distribution and attenuation were depicted with the model. Conclusion Under quasi-static approximation condition the galvanic coupling IBC electromagnetic theoretic model is developed and validated. It is provided the preliminary theoretic base on IBC teehnique.