阻抗测量中数字相敏检波技术研究  

Research on DPSD Technique In Impedance Measuring

作　　者：吴凡[1] 穆平安[1] 戴曙光[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《电子科技》2016年第12期59-61,64,共4页Electronic Science and Technology

摘　　要：为克服阻抗测量中模拟相敏检波低频响应差、受元器件精度影响等缺点,提出了一种用数字相敏检波技术代替模拟相敏检波技术的方法。根据自由轴法分离矢量电压的实部和虚部的基本原理,通过对采样值进行循环右移获得正交的基准信号并进行乘累加取平均,最终得到精确结果。在Matlab中建立仿真模型,并仿真验证了该方法的可行性。结果表明,该方法不仅能克服模拟相敏检波的缺点且简化了电路。In order to get rid of disadvantages of APSD such as poor low frequency response and affected by the precision of components, present a method to use the digital phase sensitive detection technology instead of analog phase sensitive detection technology. According to the principle of free - axis method to separate the real and imagi- nary parts of vector voltmeter, through the cyclic shifts of sampling value to obtain the orth by taking the average of MAC, finally obtain accurate results. Simulation model is set up of the method is simulated and verified. The results show that the method can not only APSD but also simplify the circuit.

关 键 词：自动平衡电桥 自由轴法 数字相敏检波 

分 类 号：TM936[电气工程—电力电子与电力传动]