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| Research for Reproducing SI Unit of Capacitance by the Calculable Capacitor with a Movable Guard Rod |
| LU Zu-liang1,HUANG Lu1,YANG Yan1,ZHAO Jian-ting1,QIAN Jin1,LU Wen-jun1,LIU Zhong-you1,ZHANG Zhong-hua1,LIU Xiu-ying1,WANG Jian-bo2,WANG Wei1,HE Xiao-bing1 |
1.National Institute of Metrology, Beijing 100029, China;
2.School of Physics Science and Engineering, Tongji University, Shanghai 200092, China |
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Abstract A new type calculable capacitor with a movable guard rod has been built in National Institute of Metrology of China at the standard uncertainty of 2×10-8. The SI unit of capacitance reproduced by the calculable capacitor depends on the axial length which is measured by a laser interferometer. However the huge integral number of the fringe is in general not given by the laser interferometer. In a classical approach the substitution measurements were adopted to extend the integral number from a known smaller value to the bigger one. It needs some additive devices and complex operations. A novel approach is proposed. The required integral number is determined by the other capacitance standard with a lower accuracy, and the decimal number is determined by the capacitance bridge with a transfer capacitor. The details of this approach and its advantages are presented. An experiment to check the linear is reported.
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2014, Vol. 35 
