Position control for the MSL Kibble balance coil using a syringe pump

Authors

  • Rebecca J Hawke Measurement Standards Laboratory (MSL), Lower Hutt, New Zealand http://orcid.org/0000-0002-6252-0840
  • Mark T Clarkson Measurement Standards Laboratory (MSL), Lower Hutt, New Zealand

DOI:

https://doi.org/10.21014/actaimeko.v11i4.1343

Keywords:

Kibble balance; pressure balance; position control; volume control

Abstract

The position of the coil in a Kibble balance must be finely controlled. In weighing mode, the coil remains stationary to maintain a constant magnetic field. In calibration mode, the coil is moved in the magnetic field to induce a voltage. The MSL Kibble balance design is based on a twin pressure balance where the coil is attached to the piston of one of the pressure balances. Here we investigate how the piston (and therefore coil) position may be controlled through careful manipulation of the gas column under the piston. We demonstrate the use of a syringe pump as a programmable volume regulator which can provide fall rate compensation as well as controlled motion of the piston. We show that the damped harmonic oscillator response of the pressure balance must be considered when moving the coil. From this initial investigation, we discuss the implications for use in the MSL Kibble balance.

Author Biographies

Rebecca J Hawke, Measurement Standards Laboratory (MSL), Lower Hutt, New Zealand

Research Scientist, Mass and Pressure

Mark T Clarkson, Measurement Standards Laboratory (MSL), Lower Hutt, New Zealand

Principal Research Scientist, Mass and Pressure

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Published

2022-11-30

Issue

Vol. 11 No. 4 (2022)

Section

Research Papers

License

Copyright (c) 2022 Rebecca J Hawke, Mark T Clarkson

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