Capacitive position sensing system with resonant amplification

Details Capacitive position sensing system with resonant amplification Capacitive position sensing system with resonant amplification

2006-02-28

2006-02-28

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

C324S658000

Reexamination Certificate

active

07005864

ABSTRACT:
At least one exemplary embodiment of the present invention includes a capacitive sensing system, comprising a sensing conductor coupleable to a grounded target by a gap capacitance Cd, said grounded target separated from said sensing conductor by a gap having a width. The capacitive sensing system also comprises a circuit connected to said sensing conductor, an input signal having an input frequency foscprovided to said circuit through an input resistance Rd, an output signal of said circuit having an output voltage varying linearly with the width of the gap when the impedance of the gap capacitance 1/(2πfoscCd) approaches or exceeds the input resistance Rd.

REFERENCES:
patent: 5434427 (1995-07-01), Crane et al.
patent: 5757196 (1998-05-01), Wetzel
Baxter, Larry K.,Capacitive Sensors: Design and Applications, Dec. 1997, IEEE.

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