12电极ECT测量电路设计

12电极ECT测量电路设计 DESIGN OF SENSOR ELECTRONICS FOR A 12 ELECTRODE ECT SYSTEM 苏祥芳 Su Xiangfang 1 first-author 潘敏 Pan Min 1 卢振陶 Lu Zhentao 1 黄乐新 Huang Lexin 1 王延平 Wang Yanping 1 武汉大学电子信息学学院 武汉大学电子信息学学院 College of Electronic Information,Wuhan University College of Electronic Information,Wuhan University 介绍了１２电极ＥＣＴ成像系统测量的原理及设计．研制了一种高频抗杂散电容的充电转换差分放大探测电路，并设计出与１２电极相配合、数据稳定、高分辨的一套控制时序，较好的实现了低漂移、高灵敏度及低噪声的测量．该测量电路可应用于最大成像率为１００帧／ｓ的系统 The principle and design of the sensor electronics for a tomographic imaging system for a electrical capacitance sensor of 12 electrode system is descriped,and the current detector and the parallel measurement channels are emphasized.The performance of the sensor electronics is crucial to the performance of the imaging system.The problems associated with such a measurement process are discussed and solutions are descriped.Test results show that the present design has a resolution of 0.01 pF,a large dynamic range of 76 dB and a data acquisition speed of 6 600 measurements per second.This enables sensors with up to 12 electrods to be used in a system with maximum imaging rate of 100 frames per second. ECT 电容测量电路 充电注入效应 低噪声 数据捕获率 ECT capacitance charge injection effect low noise level data capture rate TP274.23 国家自然科学基金(61672102) 1997-05-01 2021-04-01 5