A Robust Criterion for Distinguishing Stationary and Transition Regions of PJVS Voltage Steps
麻滨麒 1徐晴 2陈铭明 2赵伟 1王磊 3李世松1
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作者信息
1. 清华大学电机工程与应用电子技术系,北京 100084
2. 国网江苏省电力有限公司营销服务中心,南京 210019
3. 中国计量科学研究院,北京 100029
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摘要
可编程约瑟夫森电压基准(programmable Josephson voltage standard,PJVS)通过生成阶梯波构建交流量子电压,其产生量子电压台阶过程中,会伴生过渡过程,导致电压台阶两端数据的准确性较低.常见的数据处理方法是将过渡过程的数据剔除,仅利用量子电压台阶上平稳区的数据,实现交流量子电压量值的复现.针对常用的3σ(σ为数据标准差)准则、片段采样方法等数据筛选准则,该文提出一种由量子电压台阶中心双向延拓并最小化A类测量不确定度的平稳区与过渡区判据,通过自动识别量子电压台阶的平稳区与过渡区,提升 PJVS 电压阶梯波复现交流电压量值的准确性.实验结果表明:该文提出的数据平稳区与过渡区的判据具有较高的鲁棒性和交流电压复现准确性,在2.5 kHz范围内,可使量子电压阶梯波信号复现交流电压幅值的偏差和A类测量不确定度均优于2.5×10-6.研究成果可有效提升量子电压阶梯波信号的测算准确性.
Abstract
The programmable Josephson voltage standard(PJVS)can generate an AC voltage reference by using stepped waves.When the step wave is generated,it usually contains a transition in each quantum voltage step,resulting in low-accuracy data at ends of voltage steps.The conventional data processing method is to filter the transition process data and use only the data of the stationary region in quantum voltage steps in order to achieve a better reproduction of AC quantum voltage value.Aiming at the commonly used data screening criterion such as 3σ criterion and piecewise sam-pling method,this paper proposes a robust criterion to distinguish stationary and transition regions based on bi-directionally searching the minimum type-A uncertainty from the center of the quantum voltage step.By automatically identifying the stationary and transition regions of the quantum voltage steps,the accuracy of reproducing AC voltage value based on PJVS voltage staircase waveform is improved.The experimental results show that the proposed criterion distinguishing stationary and transition regions has a good robustness and high accuracy of AC quantum voltage value re-production.Within 2.5 kHz,the deviation of the amplitude of the AC voltage and the type-A uncertainty of amplitude is less than 2.5×10-6 for the quantum voltage step wave signal.The research of this paper can effectively improve the meas-urement accuracy of quantum voltage step wave signal.
维普
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