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Proceedings Paper • new

Misalignment recognition of mass pan in joule balance
Author(s): Yang Bai; Yunfeng Lu; Zhengkun Li; Dawei Wang; Qing He; Zhonghua Zhang
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Paper Abstract

Joule balance is one of the precise instruments to measure the Plank constant for redefining the kilogram. During the measurement of the joule balance, two electrified coils produce an electromagnetic force to balance the gravity of a standard mass on the mass pan. However, if the mass pan is in a misalignment state, it will waggle and change the posture of the suspended coil during the mass exchanging progress. Then the alignment errors will be induced. In joule balance, the posture of the mass pan cannot be directly measured, which however can be decoupled by measuring the posture of the suspended coil. In this paper, the recognition method of the mass pan misalignment status will be discussed. By measuring and calculating the positon changing of the suspended coil, the alignment states of the mass pan can be evaluated.

Paper Details

Date Published: 7 March 2019
PDF: 6 pages
Proc. SPIE 11053, Tenth International Symposium on Precision Engineering Measurements and Instrumentation, 1105310 (7 March 2019); doi: 10.1117/12.2511217
Show Author Affiliations
Yang Bai, National Institute of Metrology (China)
Key Lab. for the Electrical Quantum Standard of AQSIQ (China)
Yunfeng Lu, National Institute of Metrology (China)
Key Lab. for the Electrical Quantum Standard of AQSIQ (China)
Zhengkun Li, National Institute of Metrology (China)
Key Lab. for the Electrical Quantum Standard of AQSIQ (China)
Dawei Wang, Harbin Institute of Technology (China)
Qing He, National Institute of Metrology (China)
Key Lab. for the Electrical Quantum Standard of AQSIQ (China)
Zhonghua Zhang, National Institute of Metrology (China)
Key Lab. for the Electrical Quantum Standard of AQSIQ (China)


Published in SPIE Proceedings Vol. 11053:
Tenth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Jie Lin, Editor(s)

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