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This study introduces an advanced control system for the Magnetic Suspension Mass Comparator (MSMC) to precisely compare masses in air and vacuum. The new state-feedback control significantly improves accuracy for mass metrology.

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Area of Science:

  • Metrology and Measurement Science
  • Control Systems Engineering
  • Applied Physics

Background:

  • The Magnetic Suspension Mass Comparator (MSMC) at NIST aims for direct mass artifact comparison between air and vacuum environments.
  • Previous control methods using PID controllers and magnetic field measurements had limitations in achieving high accuracy.
  • Accurate mass comparison requires minimizing lateral forces and moments during magnetic suspension.

Purpose of the Study:

  • To present a novel state-feedback control scheme for the MSMC.
  • To implement laser interferometric displacement measurement for enhanced control precision.
  • To improve the accuracy of mass artifact comparison in the MSMC.

Main Methods:

  • Implementation of a state-feedback control strategy.
  • Utilizing laser interferometric displacement measurement with a 5 nm (RMS) noise floor.
  • Employing a single magnetic actuator for vertical suspension, with gravity and magnetic field symmetry for lateral stability.

Main Results:

  • Demonstrated improved performance over previous PID-based control with magnetic field measurements.
  • Achieved high-precision magnetic suspension necessary for the MSMC's accuracy requirements.
  • The combined optical measurement and state-feedback control strategy enhanced the system's capabilities.

Conclusions:

  • The developed state-feedback control system with optical displacement measurement offers superior performance for the MSMC.
  • This advanced control scheme is crucial for achieving the target relative uncertainty of 20 × 10⁻⁹.
  • The findings represent a significant advancement in precision mass metrology instrumentation.