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

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

2006-08-01

2006-08-01

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

68

Reexamination Certificate

active

07084643

ABSTRACT:
A non-contact capacitive sensor including: a sensor plate configured to be displaced from a surface and to measure a capacitance of a gap between the surface and sensor plate; an active shield plate over the sensor plate and insulated from said sensor plate, wherein a high frequency input signal is applied to the active shield plate and sensor plate; an effective ground shield plate connected through a first resistor to a ground, over the active shield plate to sandwich the active shield plate between the ground shield plate and the sensor plate, and the ground shield plate is insulated from the active shield plate, and a second resistor connected between the ground shield plate and the active shield plate to provide a direct current (dc) path through the sensor.

REFERENCES:
patent: 5521515 (1996-05-01), Campbell
patent: 5539323 (1996-07-01), Davis, Jr.
patent: 6937951 (2005-08-01), Gibb et al.
patent: 2 756 048 (1998-05-01), None
European Search Report mailed Jul. 14, 2005, filed with U.S. Appl. No. 10/825,185.

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