Method and apparatus for optically measuring absolute displacement
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United States of America Patent
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Sep 11, 2007
Grant Date -
Jan 27, 2005
app pub date -
Jul 23, 2004
filing date -
Jul 24, 2003
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus using two sets of polarized light detection systems are disclosed for optically measuring absolute displacement. In the first detection system a step motor is controlled to drive an analyzer to trace synchronously the displacement being measured by comparison of the magnitude of the intensity of two orthogonal light beams and then the number of control pulses from the step motor becomes a value of the displacement measured; and by comparison with the magnitude the intensity of a plurality of light beams with phase difference from a plurality of light paths in the second polarized light detection system the section of system operation is ascertain and consequently the absolute displacement is detected and measured.
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