Eddy current sensor and sensor coil for the same
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United States of America Patent
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Feb 26, 2008
Grant Date -
Oct 4, 2007
app pub date -
Dec 1, 2006
filing date -
Dec 2, 2005
priority date (Note) -
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Abstract
The invention pertains to an eddy current sensor with a sensor circuit having a head portion, including a sensor coil, a base portion and a transmission cable connecting the head portion to the base portion. The transmission cable is a triaxial cable and the sensor coil is connected between the inner conductor and the outer shield of this cable. The base portion of the sensor circuit comprises a voltage follower connected to buffer the voltage of the center conductor and apply it to the inner shield of the triaxial cable in order to isolate the cable's line capacitance from the sensor coil. The invention further concerns a sensor coil for an eddy current sensor, having a segmented winding structure with a particularly low self-capacitance. In a preferred embodiment, the triaxial transmission cable is combined with a sensor coil having this segmented winding structure.
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