一种基于FlexiForce的多点阵列式压力采集系统

A multi-point array pressure acquisition system based on FlexiForce

设计一种基于FlexiForce薄膜式压力传感器多点阵列式采集系统。该系统将FlexiForce薄膜式压力传感器输出的阻值变化变为电压信号并具有一定的放大作用,同时支持多路选择功能,实现了8×8路压力采集。采用VC++编写上位机软件界面,显示压力数据及图像,最后导出数据对整个系统的性能进行评估分析。实验结果表明,系统电压值随着压力的增加而下降,压力的平稳增加和降低时不会出现跳跃、突变等现象,零压力时电压保持在5 V,最小电压值保持在1 V左右,经过计算,最终误差均满足FleixForce薄膜压力传感器1%的误差范围。

A multi-point array acquisition system based on the FlexiForce thin-film pressure sensor is designed.The system can convert the resistance output by the FlexiForce thin-film pressure sensor into voltage signals with a certain amplification.Meanwhile,the system can support the multichannel selection function and realize 8×8 channel pressure acquisition.The VC++is used to compile for the software interface of the upper computer,so as to display pressure data and image.The data is exported to evaluate and analyze the performance of the whole system.The experimental results show that the voltage value of the system decreases with the increase of pressure,phenomena like jump and mutation do not occur as the pressure increases or decreases steadily,the voltage maintains at 5 V when the pressure is zero,the minimum voltage value maintains at about 1 V,and the calculation results show that all the final errors are below 1%,which meets the error scope of the FleixForce thin-film pressure sensor.