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一、引言Harvey 第一次设计的低温电流比较仪采用超导屏蔽,并用超导量子干涉器作磁通检测器,与常规电流比较仪10~(-8)的准确度相比,精密测量直流电流比率的准确度在1×10~(-10)
I. INTRODUCTION Harvey’s first design of cryogenic current comparator uses superconducting shield and superconducting quantum interference device as magnetic flux detector. Compared with the accuracy of conventional current comparator 10 ~ (-8), the accuracy of DC Current ratio accuracy of 1 × 10 ~ (-10)