Wireless optical instrument for position measurement and method of use therefor
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United States of America Patent
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Aug 19, 2003
Grant Date -
N/A
app pub date -
May 16, 2001
filing date -
Apr 3, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Disclosed is a wireless instrument tracking system. The wireless instrument tracking system is used for determining the location of at least one point relative to the instrument in a three-dimensional space relative to a three-dimensional coordinate tracking system. Advantageously, a first wireless instrument can be placed into the optical field with the wireless instrument including a wireless receiver and at least one optical position indicator. The optical position indicator is typically light emitting diodes (18) and communicates with corresponding measurement sensors (30) across a wireless optical link. The wireless optical link is time multiplexed with repetitive time frames divided into time slots. Each LED (18) emits an infrared signal or flashes in a respective time slot of a time frame. The measurement sensors (30) are preferably CCD cameras. The LEDs (18) are synchronized with the cameras and once synchronized each LED (18) flashes in a different time slot in synchronization with the camera frame rate.
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