基于555时基电路的电容式传感器测量电路  

Capacitive sensor measuring circuit based on the 555 timer

作　　者：刘远社[1] 

机构地区：[1]西南民族大学电气信息工程学院,四川成都610041

出　　处：《西南民族大学学报（自然科学版）》2015年第3期338-340,共3页Journal of Southwest Minzu University(Natural Science Edition)

摘　　要：由电容传感器和555时基电路构成多谐振荡器,将电容转化为频率,使电容的极距与频率成正比,再通过F/V转换器将频率转换为电压,由减法器输出与极板位移相应的电压,最后由显示器给出被测的位移量.通过实验对比,取得了满意的效果,在2mm范围内测量非线性误差小于1.2%,能较好地满足实际测量要求.Capacitive sensor measuring circuit made up of the 555 timer is introduced. The circuit is a muhivibrator of converting capacity into frequency, being in direct proportion to the distance between plats of capacitor. The frequency is converted into voltage by F/V convertor. The voltage is corresponding with displacement of the plat, by the subtracter output, by LED display. The circuit design achieves good results. In 2mm measurement range, the nonlinear error is not more than 1.2% , thus able to satisfy requirement in factual measurement.

关 键 词：电容传感器 测量电路 时基电路 F/V转换器 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]