Wireless magnetic motion capture system - Compensatory tracking of positional error caused by mutual inductance

Shuichiro Hashi, Masaharu Toyoda, Shin Yabukami, Kazushi Ishiyama, Yasuo Okazaki, Ken Ichi Arai

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

A wireless magnetic motion capture system using an LC resonant magnetic marker was developed and has been studied. The positional error of the system caused by mutual inductance between the exciting coil and the LC marker was examined. It has been found that the impedance change of the exciting coil due to a resonance of the LC marker perturbs the strength of the magnetic field which is used for marker excitation. The more a marker approaches the exciting coil, the larger it becomes. This fluctuation induces an error in the marker signal which is measured by the pickup coils and is necessary for positional calculation. Then, the compensatory process in consideration of the mutual inductance has been employed for positional calculation in order to improve the positional accuracy. From the compensation, the absolute positional accuracy is less than 2 mm within 140 mm of the pickup coil array.

Original languageEnglish
Pages (from-to)2364-2366
Number of pages3
JournalIEEE Transactions on Magnetics
Volume43
Issue number6
DOIs
Publication statusPublished - 2007 Jun 1

Keywords

  • Compensatory tracking
  • LC resonant magnetic marker
  • Positional error
  • Wireless motion capture system

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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