Capacitive sensor and method for non-contacting gap and...

Details Capacitive sensor and method for non-contacting gap and... Capacitive sensor and method for non-contacting gap and...

2007-08-14

2007-08-14

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S658000, C324S661000, C324S662000, C324S671000, C324S672000

Reexamination Certificate

active

10825185

ABSTRACT:
A method for non-contact measurement of a displacement between a surface and a capacitive sensor comprised of at least two superimposed conductive plates electrically insulated one from the other and a sensor circuit coupled to the plates including: positioning the capacitive sensor proximate to the surface such that the displacement is a distance of a gap between the surface and one of the plates; applying a high frequency signal to the plates; applying the high frequency signal and a sensor plate to control a voltage gain of an amplifier in the circuit, where the capacitance on the sensor is indicative of the displacement between the sensor and surface; differentiating an output of the amplifier and the high frequency signal, and determining a value of the displacement based on the difference between the output of the amplifier and the high frequency signal.

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European Search Report mailed Jul. 14, 2005.

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