Optical position sensing device and method for sub-micron measurement
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United States of America Patent
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Dec 1, 1998
Grant Date -
N/A
app pub date -
Sep 27, 1996
filing date -
Sep 27, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A high resolution, independent position sensor is provided, having application in a magnetic tape drive and other environments in which a linear or angular position is to be monitored. Analog outputs from an inexpensive, low resolution optical encoder are processed to correct gain and offset distortions and are used as the basis for an interpolation process. If a code strip having a 127-micron grating is used, a resolution of about 0.125 microns can be achieved.
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