Method of sensing tilt, tilt sensor, and method of...

Geometrical instruments – Indicator of direction of force traversing natural media – Level or plumb – terrestrial gravitation responsive

Reexamination Certificate

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C033S366220

Reexamination Certificate

active

07100294

ABSTRACT:
A method of sensing tilt includes applying an electrical signal, such as voltage, current, a constant signal, or a time-varying signal to at least one electrode of a first set of electrodes and measuring an electrical parameter using at least one electrode of a second set of electrodes. The electrodes are disposed in a conductive medium within an envelope. The electrical parameter represents tilt relative to a first axis. The electrical roles of the first and second sets of electrodes are reversed to determine tilt relative to a second axis. No more than four electrodes are used to determine tilt relative to two axes. A tilt sensor includes an envelope, conductive medium in the envelope, and four electrodes. A method of making a tilt sensor includes providing at least four electrodes, forming an envelope to receive at least a portion of the electrodes, placing a conductive medium into the envelope, and sealing the conductive medium in the envelope.

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patent: 2003/0110652 (2003-06-01), Greway
patent: 2004/0016137 (2004-01-01), Barsky

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