基于矢量调制的多因子误差补偿方法研究  

Research on Multiple Factor Error Compensation Method Based on Vector Modulation

作　　者：储开斌[1] 江楠 冯俊鹏 CHU Kaibin;JIANG Nan;FENG Junpeng(College of Information Science and Engineering,Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学信息与科学工程学院,江苏常州213164

出　　处：《自动化仪表》2018年第10期6-10,共5页Process Automation Instrumentation

基　　金：国家自然科学基金资助项目(61772090)

摘　　要：自动平衡电桥是阻抗分析仪的核心。在高频段,由于分布参数的影响,矢量合成的正交信号源不能保证严格的正交,使电桥无法达到平衡,高频测量性能普遍较差,限制了自动平衡电桥的应用。为此,建立了一种基于矢量调制的多因子误差自动补偿方法。在误差电压经过矢量检波得到两路正交信号后,通过多个补偿因子调节两路正交信号的幅度与相位,得到两路标准正交信号,使电桥达到平衡,从而适用于高频测量。运用该方法设计的自动平衡电桥电路,工作频率范围拓宽为20 Hz^20 MHz。该方法应用到阻抗分析仪时,以Agilent标准电阻及标准电容作为被测件(DUT),在20 Hz^2 MHz内测量精度为0. 2%,在2~20 MHz内测量精度达到0. 87%。该方法解决了传动自动平衡电桥在高频段无法平衡的问题,在保证测量精度的同时,拓宽了测量频率范围,能够满足市场的需求。The automatic balance bridge circuit designed by this method extends the operating frequency range of 20 Hz-20 MHz. When it is applied to an impedance analyzer,Agilent s standard resistance and standard capacitance are used as the device under test（DUT）,the measurement accuracy is 0.2% in 20 Hz-2 MHz,and the measurement accuracy is 0.87% in 2-20 MHz This method solves the problem that the automatic balance bridge cannot be balanced in high frequency section; it ensures the accuracy of measurement,and broadens the measurement frequency range.It meets the needs of the market and has been applied in the impedance analyzer of a certain company.

关 键 词：矢量调制 误差补偿 阻抗测量 自动平衡电桥 正交信号 阻抗分析仪 

分 类 号：TH86[机械工程—仪器科学与技术] TP202.2[机械工程—精密仪器及机械]