Out-of-round coder
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United States of America Patent
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Jan 10, 2012
Grant Date -
Jun 3, 2010
app pub date -
Feb 2, 2010
filing date -
May 31, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
An angle sensor for detecting an out-of-round condition includes a disc supporting angle coder rigidly attached to a rotating shaft and at least one fixed optical system including a coherent light source emitting a beam interfering with the angle coder of the support disc in order to code its angular position, a collimator of the said beam before interference and a photo detector of the modulated beam after interference. In one embodiment, two optical systems arranged 90° from each other are employed. An alternative embodiment includes one optical system and the disc includes a circular track radially centred in at least one of its angular positions relative to the incident collimated light beam, and a radially orientated photo detector.
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