Method and apparatus for the monitoring of the operation of linear and rotary encoders
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United States of America Patent
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Apr 11, 1995
Issued Date -
N/A
app pub date -
Dec 22, 1992
filing date -
Jul 22, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A system is disclosed for monitoring the operation of an encoder having a scale which is illuminated from a light source, in which light from the scale is detected by a detector, with the encoder having means coupled to the detector for detecting in-phase and quadrature signals representing scale position, means for detecting the phase difference between the in-phase and quadrature signals, and means responsive to the detected phase difference for adjusting the output of the light source to maintain its output at a predetermined level and for providing an error signal representing the amount of adjustment of the output of the light source.
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