基于ADA2200的开关电容微位移传感器信号处理电路研究  

Signal processing circuit based on ADA2200 in switch-capacitance micro-displacement sensor

作　　者：林天衣 李武森[1] 陈文建[1] 戚永军[2] 郑南 肖悦 Lin Tianyi;Li Wusen;Chen Wenjian;Qi Yongjun;Zheng Nan;Xiao Yue(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;National Astronomical Observatories,Nanjing Institute of Astronomical Optical Technology,Nanjing 210042,China)

机构地区：[1]南京理工大学电子工程与光电技术学院,江苏南京210094 [2]中国科学院国家天文台南京天文光学技术研究所,江苏南京210042

出　　处：《南京理工大学学报》2018年第6期693-699,共7页Journal of Nanjing University of Science and Technology

基　　金：国家自然科学基金(U1531138)

摘　　要：为实现天文望远镜子镜之间微小位移的精密测量,采用信号处理电路去除噪声影响。采用基于开关电容技术的驱动与检测器和以ADA2200为中心的位移信号解调方法,设计了主要电路模块。电容检测模块包含了开关电容驱动和电容/电压(C/V)转换电路。同步解调模块使用了ADA2200芯片,基于采样模拟技术(SAT)对信号进行同步正交解调。实验结果表明,该文方案可以实现电容极板之间相对微小位移的检测,ADA2200芯片对包含静态位移信息的调幅波的解调精度优于2.5%,对动态变化的位移参数也能够实现实时解调。The signal processing circuit of a micro-displacement sensor is researched to get rid of the noise and realize the precise measurement of the micro-displacement between two segments of an astronomical telescope.Main circuit modules are designed using a detector with drive based on switched capacitors and the displacement signal demodulation method based on ADA2200.The capacitance detection module combines the switched capacitance technology and a capacitance/voltage converter.The synchronous demodulation module adopts ADA2200 chip to realize synchronous orthogonal demodulation of signals based on sampling analog technology(SAT).Experimental results show that the micro-displacement between the capacitors’plates can be detected,the demodulation based on ADA2200 chip can realize precision better than 2.5%,and the dynamics displacement can be demodulated in real time.

关 键 词：主动光学 开关电容 微位移传感器 天文望远镜 电容检测 同步解调 采样模拟技术 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置]