基于锁相环和PWM技术的容栅传感器微小扭矩信号测试方法  

Micro Torque Measurement Utilizing Capacitive Sensor Based on PLL and PWM

作　　者：刘双红[1,2] 靳鸿[1,2] 陈昌鑫[1,2] 边晶晶[1,2] 刘璐[1,2] 

机构地区：[1]中北大学电子测试技术国家重点实验室,太原030051 [2]中北大学仪器科学与动态测试教育部重点实验室,太原030051

出　　处：《电子器件》2014年第1期59-62,共4页Chinese Journal of Electron Devices

摘　　要：针对特种车辆扭矩测试信号引线困难、信号易受干扰、安装空间狭小的难题,提出了基于容栅传感器的微小扭矩测试方法。测试借助PWM电路以及锁相环电路对信号进行调理,不需要载频和附加解调线路,电路简单,克服了安装困难的缺点,同时降低了系统的传输误差以及随机噪声干扰,提高了测试精度。实验表明系统的相对误差小于2%。The challenges in special vehicle torque test come from the signal transmission difficulties, signal disturbance and limited installation space. To solve the problems,a micro-torque measurement methods based on ca-pacitive sensor is proposed. The methods does not need to design modulating and demodulating circuit with the help of pulse-width modulation（PWM）circuit and phase locked loop（PLL）circuit. Simple circuit which overcomes the shortcomings of complex installation reduces transmission error and random noise,while increasing testing precision Experiments show that the relative error of this methods is less than 2%.

关 键 词：扭矩测试 容栅传感器 锁相环 

分 类 号：TP202.43[自动化与计算机技术—检测技术与自动化装置] TH823.3[自动化与计算机技术—控制科学与工程]