System and method for detecting abnormal movement in a gas turbine shaft
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United States of America Patent
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Jun 30, 2015
Grant Date -
Mar 21, 2013
app pub date -
Sep 14, 2012
filing date -
Sep 16, 2011
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Abstract
A sensor element for use in a backing sensor to monitor a gas turbine shaft. The sensor includes an oscillator circuit 30 having an oscillator and a resonance circuit 42, and a frequency detector 31 for monitoring the frequency of the oscillation circuit. Abnormal movement of the shaft cuts the circuit in the sensor along a cutting line (15). The cutting of the sensor changes the capacitance and/or inductance of the resonance circuit and thereby changes the frequency of oscillation.
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