The Effects of Metals and Interfering Fields on Electromagnetic Trackers

Authors:
Mark A. Nixon;Bruce C. McCallum;W. Richard Fright;N. Brent Price
Affiliations:
Applied Research Associates NZ Ltd., P.O. Box 3894, Christchurch, New Zealand;Applied Research Associates NZ Ltd., P.O. Box 3894, Christchurch, New Zealand;Applied Research Associates NZ Ltd., P.O. Box 3894, Christchurch, New Zealand;Applied Research Associates NZ Ltd., P.O. Box 3894, Christchurch, New Zealand
Venue:
Presence: Teleoperators and Virtual Environments
Year:
1998

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Abstract

The operation of six degree-of-freedom electromagnetic trackers is based on the spatial properties of the electromagnetic fields generated by three small coils. Anything in the environment that causes these fields to be distorted will result in measurement noise and/or errors. An experimental investigation was undertaken to measure the effect of external fields present in a typical working environment (namely mains and computer monitor fields) and the presence of metals (25-mm cubes of various types of metals, a large steel bar, and a large steel sheet). A theoretical model is proposed to explain the observations. Two devices were used in this investigation: a Polhemus Fastrak and an Ascension Flock of Birds.