Magnetically shielded apparatus for sensing vibration
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United States of America Patent
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-
Nov 10, 1992
Grant Date -
N/A
app pub date -
Jan 30, 1991
filing date -
Jan 30, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A vibration detector for sensing imbalance of a part in a balancing machine uses an eddy current proximity detector for sensing vibration movement of a portion of the machine. To prevent spurious signals due to magnetic fields varying at the part rotation frequency, a mu-metal can is secured to the vibrating portion of the machine, an electrically conductive coupon is attached inside the can for vibrating movement therewith, and the proximity detector is spaced from the coupon by a small gap for producing AC signals representing the vibration amplitude.
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