基于PVDF的足底测力系统研究

The Study of Foot Pressure Measurement System Based on PVDF

为实现人体不同路况运动过程中的步态识别,研制出一种便于穿戴的鞋垫式足底测力系统。以PVDF压电薄膜为传感材料,设计足底传感器。采用由电荷放大电路、滤波电路及电压放大电路组成的信号系统对传感器输出信号进行采样及处理,进行了电荷放大电路中的反馈电阻与反馈电容的实验测试选型分析研究。进行了平地行走、楼梯行走及斜坡行走的实验,实验表明,该足底测力系统具有良好的灵敏度与测量精度,并且采用PVDF内嵌在鞋垫的结构,使得测力系统适用于不同模式行走运动的检测。

A in-shoe foot force measurement system was presented with easier to wear to indentify the gait of human in different walking modes. The sensor system was designed based on PVDF. The integrating circuit, filter circuit and amplifying circuit were proposed for the signal sampling and processing of the sensor output signal. The selection of feedback resistance and capacitance in the integrating circuit were studied based on experimental test. The experiments were implemented during level, stair climbing and slope walking. The results of experiment test showed that the foot force measurement system had the function of good sensitivity and measuring accuracy, and it can be used to test of different walking mode because of the structure with the PVDF sensor in-shoe.