The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 14, 2007
Filed:
Apr. 16, 2004
Jack E. Howard, Gardnerville, NV (US);
Oliver H. Lieder, Carson City, NV (US);
Brian Burket Bowlds, Minden, NV (US);
Paul Austin Lindsay, Gardnerville, NV (US);
Jack E. Howard, Gardnerville, NV (US);
Oliver H. Lieder, Carson City, NV (US);
Brian Burket Bowlds, Minden, NV (US);
Paul Austin Lindsay, Gardnerville, NV (US);
General Electric Company, Schenectady, NY (US);
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.