基于约瑟夫森量子电压的交流功率测量系统及方法研究

基于约瑟夫森量子电压标准设计了交流功率差分测量系统。通过分析差分采样系统的误差分布及误差传递函数,提出换向差分测量方法,减小了差分采样系统的增益误差,提高了电压幅值测量准确度;通过分析衰减系数η,证明了采用换向差分测量较容易实现10-7量级电压幅值测量。通过评估差分采样系统零相位,结果证明了差分采样系统具有较好的相位测量稳定性。分析了交流功率差分测量系统的不确定度分量,评估了功率因数为1.0,0.5 L和0.5 C时的功率测量不确定度,通过与国家交流功率基准装置进行实验比对,证明了基于约瑟夫森量子电压交流功率测量系统不确定度评估的合理性。

Research on AC Power Measurement System and Method Based on Josephson Quantum Voltage

An AC power differential measurement system was designed based on the Josephson quantum voltage standard.By analyzing the error distribution and error transfer function of the differential sampling system, the sampling switching differential measurement method was proposed, which reduced the gain error of the differential sampling system and improved the accuracy of voltage amplitude measurement.By analyzing the attenuation coefficient η, it was proved that it is easy to realize voltage amplitude measurement of 10-7 magnitude by using switching differential measurement.By evaluating the zero phase of the differential sampling system, the results showed that the differential sampling system has better phase measurement stability.The uncertainty component of the AC power differential measurement system was analyzed, and the power measurement uncertainty of the power factor of 1.0, 0.5L and 0.5C was evaluated. Through the experimental comparison with the AC power national reference instrument, the rationality of the power measurement of the AC power measurement system based on Josephson quantum voltage was proved.