Magnetic position and orientation measurement system with magnetic field permeable attenuator
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United States of America Patent
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-
Aug 31, 2004
Grant Date -
Sep 18, 2003
app pub date -
Mar 18, 2002
filing date -
Mar 18, 2002
priority date (Note) -
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status (Latency Note)
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Abstract
A transmitter assembly includes a sandwich made up of a three axis transmitter, driven by a transmitter driver, mounted on a permeable attenuator with a spacer interposed between the transmitter and the attenuator. The attenuator is mounted on top of a conductive plate. A compensation coil is provided and driven by a compensation coil driver that energizes the compensation coil to optimize compensation for magnetic field edge effects. A number of individual compensation coils may be arranged about the periphery of the conductive plate or permeable attenuator. The individual compensation coils in the modification may be activated in tandem or individually to compensate for non-uniform magnetic edge fields caused by he non-symmetrical configuration of, for example, three transmitter coils or, for example, a square permeable attenuator rather than a circular permeable attenuator.
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