A novel automatic mass comparator with a resolution of 10 ng for calibration of masses below 2 mg

Abstract This paper presents a novel mass comparator designed for the purpose of measuring small weights of 2 mg and lower, with readability of 10 ng. The mass comparator was developed using new types of coil and actuator. The added protective ring decreased the average sorption-induced mass variation for the coil by 84%. The accuracy of the novel comparator was verified in terms of stability, Type An uncertainty, and repeatability. Compared to the device of the best available accuracy, the standard uncertainties of the novel-design comparator were approximately 70% narrower.

[1]  Kazunaga Ueda,et al.  Development of a high-accuracy 500 kg mass comparator for improved weight calibration capability , 2017 .

[2]  A. Trench,et al.  Rare Earth Permanent Magnets and Their Place in the Future Economy , 2020 .

[3]  Chih-wen Chen,et al.  Magnetism and Metallurgy of Soft Magnetic Materials , 2011 .

[4]  Edgar Dietrich,et al.  Measurement Process Qualification: Gage Acceptance and Measurement Uncertainty According to Current Standards , 2011 .

[5]  Tadeusz Szumiata.  Optimization of Mass Standards and Weights Calibration (1 mg - 1 kg) Using Rotational Automatic Mass Comparator. , 2017 .

[6]  Tsu-Ming Yeh,et al.  Using the Monte Carlo Simulation Methods in Gauge Repeatability and Reproducibility of Measurement System Analysis , 2013 .

[7]  Forrest W. Breyfogle,et al.  Implementing Six Sigma: Smarter Solutions Using Statistical Methods , 1999 .

[8]  Richard K. Leach,et al.  Fundamental Principles of Engineering Nanometrology , 2009 .

[9]  Richard Leach.  Chapter 10 – Mass and Force Measurement , 2014 .

[10]  Frank Jones,et al.  Handbook of mass measurement , 2020 .

[11]  K. Binnemans,et al.  Solvometallurgical route for the recovery of Sm, Co, Cu and Fe from SmCo permanent magnets , 2019, Separation and Purification Technology.

[12]  M. Marinescu,et al.  Current Status of Rare-Earth Permanent Magnet Research in USA , 2006 .

[13]  S. Standard.  GUIDE TO THE EXPRESSION OF UNCERTAINTY IN MEASUREMENT , 2006 .

[14]  Richard Davis,et al.  Errors due to magnetic effects in 1 kg primary mass comparators , 2007 .

[15]  W. Gong,et al.  Behavior of some heavy and light rare earth-cobalt magnets at high temperature , 2002 .

[16]  R. Krishnan,et al.  Permanent Magnet Synchronous and Brushless DC Motor Drives , 2009 .