Fiber optic sensor for precision 3-D position measurement
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United States of America Patent
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May 3, 2005
Grant Date -
Aug 26, 2004
app pub date -
Feb 26, 2003
filing date -
Feb 26, 2003
priority date (Note) -
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Abstract
The central system component of the present invention is a flexible 'smart cable' which enables accurate measurement of local curvature and torsion along its length. These quantities are then used to infer the position and attitude of one end of the cable relative to the other. Sufficiently accurate measurements of the local curvature and torsion along the cable allow reconstruction of the entire cable shape, including the relative position and orientation of the end points. The smart cable for making these measurements comprises a multicore optical fiber, with individual fiber cores constructed to operate in the single mode regime, but positioned close enough to cause cross-talk (mode coupling) between cores over the length of the fiber. This cross-talk is very sensitive to the distribution of strains (curvature and torsion) along the cable.
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