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电容检测
    The Effect and Compensation of Charge Injection Capacitance for Charge/Discharge Capacitance Measuring Circuits Used in Electrical Capacitance Tomography
    充放电电容检测电路中电荷注入影响的补偿
    Application of Small Capacitance Measuring Techniques in Gravimeter
    微小电容检测技术在重力敏感器中的应用研究
    In this paper three types of low value capacitance measuring circuits,the charge/discharge circuit,the AC measuring circuit with feedback compensation,and the self-balancing capacitance measuring circuit are described,which are most suitable for the use in ECT system,Their advantages and disadvantages are also pointed out.
    本文介绍了ECT系统中最常用的3种微小电容检测电路—充电/放电电路、带反馈补偿的交流测量电路以及自平衡电容测量电路,并指出了它们的优缺点。
    Emphasis is made on the character of the system's structure, including overall system design, the controlling circuit of electrode arrays, the AC-based capacitance measuring circuit, soft ware compensation for coupling capacitance of CMOS switches, system calibration and communication circuit.
    主要论述了该系统的结构特色 ,包括整体方案、极板控制阵列、基于AC的微小电容检测系统、软件补偿CMOS开关的耦合电容、系统标定和通信电路
    In usual ECT system,each electrode employs its own capacitance measuring circuit and the projection data derived from the same excitation(electrode) is converted into DC signals in parallel.
    通常的ECI系统中,每个电容极板都有自己的电容检测电路,对应于同一激励源的所有投影数据并行地转换成直流信号.
    All the electrodes use a common capacitance measuring circuit,and the projection data derived from the same excitation electrode is converted into DC signals in serial,thus the hardware cost is reduced and the difference among the parallel measuring circuits is eliminated.
    各极板共用一套电容检测电路,对应于同一激励源的所有投影数据串行地转换成直流信号,降低了硬件成本,消除了并行测量方式通道差异所带来的误差.
 

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