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A Six-Axis heterodyne interferometer system for the joule balance

  • Yang Bai
  • , Pengcheng Hu*
  • , Yunfeng Lu
  • , Zhengkun Li
  • , Zhonghua Zhang
  • , Jiubin Tan
  • *Corresponding author for this work
  • Harbin Institute of Technology
  • National Institute of Metrology China
  • Key Laboratory for the Electrical Quantum Standard of AQSIQ

Research output: Contribution to journalArticlepeer-review

Abstract

A six-axis heterodyne interferometer system has been designed for the joule balance to measure the relative displacement between the suspended coil and the exciting coil. The essential optical components in this system are three dual-axis heterodyne interferometers. Each interferometer can simultaneously measure the displacements of one retroreflector (RR) on the suspended coil and one RR on the exciting coil. Because of the common path structure, this interferometer is susceptible to periodic nonlinearity caused by double-frequency mixing. However, a method can be used to eliminate the periodic errors. The measured displacements can be strictly locked to integral multiples of half the wavelength. This method was theoretically analyzed and finally verified by the experiment.

Original languageEnglish
Article number7801852
Pages (from-to)1579-1585
Number of pages7
JournalIEEE Transactions on Instrumentation and Measurement
Volume66
Issue number6
DOIs
StatePublished - Jun 2017

Keywords

  • Feedback control
  • Joule balance
  • Laser interferometer
  • Measurement uncertainty
  • Periodic nonlinearity

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