摘要
提出了一种新型的基于PCB覆铜板的手写位置传感系统。首先建立PCB手写板仿真模型,数值模拟了不同激励模式下的电场分布,并根据仿真结果优选了适合微弱信号检测的激励模式。其次,设计并实现了基于锁相放大原理的激励源和微弱信号检测系统,其中包括交流恒流激励源、窄带带通滤波器、高增益低噪声放大器、双锁相放大器的设计原理和方法。在画笔定位算法上提出了基于线性插值的等势线相交法。仿真分析与实验结果表明,所设计的手写系统能够在PCB覆铜板上准确定位画笔的位置。
The PCB handwriting board sensor is introduced.With the model of PCB handwriting board,the numerical simulations of the electric fields are conducted and the driving modes fitting for weak signal detection are optimized using the results of the simulations.And then,the driving source and weak signal detection system based on the principle of phase-locked amplifier are designed and realized,which focus on the design principles and methods of AC current source,narrow band pass filter,high gain low noise amplifier,dual phase lock-in amplifier,etc.The method of equipotential line intersection with linear interpolation is presented and verified experimentally.The simulation and experimental results show that the designed system can realize the location of the contact point with the PCB printed board.
作者
姜文聪
郭亮
Jiang Wencong;Guo Liang(College of Control Science and Engineering,China University of Petroleum,Qingdao 266580,China)
出处
《电子测量技术》
北大核心
2021年第11期9-15,共7页
Electronic Measurement Technology
基金
青岛市应用基础研究计划项目(青年专项)(19-6-2-60-cg)资助。
关键词
电场检测
场路耦合
锁相放大器
PCB手写板
electric field detection
field-circuit coupling
phase lock-in amplifier
PCB handwriting board
