计算电容屏蔽电极位移测量的不确定度评估

doi:10.3969/j.issn.1000-1158.2022.04.01

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Abstract The calculable capacitor is a classical and fundamental experiment apparatus in precise electromagnetic measurements. It is followed the ‘new’ electromagnetic principle which is firstly introduced by Lampard D G and Thompson A E. The calculable capacitor is the AC impedance primary standard, and its the traceable source of the capacitance, inductance and AC impedance. It is a high-accuracy (at the level of 10-8) apparatus surpassed only by the quantum Josephson voltage and quantum Hall resistance experiments in the electromagnetic metrological field, and it is expected to reach the level of 10-9 through continual improvements and optimizations to improve the uncertainty level of electromagnetic metrology. The basic principle of the displacement measurement in calculable capacitor is presented, and impact factors, including Fabry-Perot interferometer locking, laser wavelength, residual index of refraction of air, cosine error and Gouy phase correction, are analyzed. Combining the repeatability of capacitance produced by calculable capacitor, a relative standard uncertainty of 4.7×10^-9 is obtained.

Key words： metrology calculable capacitor displacement measurement locking interferometer uncertainty evaluation blocking electrode

Received: 19 March 2021 Published: 08 April 2022

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TB971

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	Articles by authors
	WANG Jian-bo
	YIN Cong
	QIAN Jin
	LIU Zhong-you
	HUANG Lu
	YANG Yan
	LU Zu-liang

Cite this article:

WANG Jian-bo,YIN Cong,QIAN Jin, et al. Uncertainty Evaluation on Displacement of Blocking Electrodes in Calculable Capacitor[J]. Acta Metrologica Sinica, 2022, 43(4): 437-444.

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http://jlxb.china-csm.org:81/Jwk_jlxb/EN/10.3969/j.issn.1000-1158.2022.04.01 OR http://jlxb.china-csm.org:81/Jwk_jlxb/EN/Y2022/V43/I4/437

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