| Summary: | 碩士 === 國立交通大學 === 機械工程系 === 87 === In the field of industry, the engineer often confronts with
problems demanded with transducers for position, velocity, and
acceleration of the object. In the thesis, we present a method
for measuring plane position with a commercially available
compact disc optical pickup. The method is used the tracking
error signal generated by the optical pick-up head during
tracking to count the track numbers. Thus, the distance which
the pick-up head has been moved, and the position of the
pick-up head can be measured.
When the object is doing translation, we only need two
pick-up heads to measure the displacement and the position of
the object. But if the motion of the object is not only the
translation but also the rotation, two pick-up heads are not
enough for us to measure. Thus, we need three optical pick-up
heads. The displacement of the pick-up head can be measured to
calculate the actual displacement and rotation angles of the
object. The distance of track is 1.6 , hence, the accuracy of
the positioning system is achieved to 1.6 . In this implement
we can measure displacement of pickup set which rotation less
90-degree.
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