Capacitive sensor

Details Capacitive sensor Capacitive sensor

2008-08-27

2009-06-02

Ha, Nguyen T (Department: 2831)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Lumped type parameters

C324S548000, C324S658000, C324S678000, C324S688000, C324S661000, C361S278000, C361S280000, C361S291000, C361S292000

Reexamination Certificate

active

07541816

ABSTRACT:
In a capacitive sensor, a sensing electrode is positively charged, the sensing electrode and a sensing capacitor are charge-balanced, the sensing electrode is negatively charged, and then the sensing electrode and the sensing capacitor are again charge-balanced. The sensing electrode is positively and negatively charged in the same period when the capacitive sensor is sensed. So, the invention can not only effectively improve the high-frequency external interference but also effectively resist the interference when an external direct current electrical field approaches.

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