Wireless Magnetic Motion Capture System—Compensatory Tracking of Positional Error Caused by Mutual Inductance

Author

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

Author_Institution

Fac. of Eng., Gifu Univ.

Volume

43

Issue

6

fYear

2007

fDate

6/1/2007 12:00:00 AM

Firstpage

2364

Lastpage

2366

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

Keywords

coils; magnetic recording; LC resonant magnetic marker; compensatory tracking; exciting coils; marker excitation; mutual inductance; pickup coil arrays; positional calculation; positional error; wireless magnetic motion capture system; Coils; Computer errors; Electromagnetic induction; Ferrites; Inductance; Magnetic field measurement; Magnetic resonance; Position measurement; Resonant frequency; Tracking; Compensatory tracking; LC resonant magnetic marker; positional error; wireless motion capture system;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2007.892874

Filename

4202751