Eddy current sensors
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United States of America Patent
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Issued Date -
Jun 16, 2005
app pub date -
Dec 3, 2004
filing date -
Dec 3, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An inductive eddy current sensor, for use for example for measuring the speed of a turbine by detecting the passage of turbine blades (21) past a probe incorporating the sensor, includes a magnet (23) positioned so that the blades (21) pass through the flux pattern generated by the magnet (23). At least one pick-up coil (28) devoid of a core of soft magnetic is positioned alongside the magnet to pick up signals generated by eddy currents generated in the turbine blades as they cut through the flux pattern, without thereby altering the flux pattern. In a modified arrangement, the pick-up coil surrounds the magnet, again without affecting the flux pattern.
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