DC & AC coupled E-field sensor

Details DC & AC coupled E-field sensor DC & AC coupled E-field sensor

2008-04-15

2008-04-15

Anjan, Deb (Department: 2858)

Electricity: measuring and testing

Electrostatic field

C324S687000

Reexamination Certificate

active

11376026

ABSTRACT:
A method and apparatus is shown for detecting with high sensitivity by allowing the operation of an e-field amplifier without a DC bias resistor shunt with the amplifier input. E-fields produced by an approaching body, or changing E-field of the background, turn on the amplifier from a partial DC bias state with E-field coupling to the power supply of the amplifier. The result is high sensitivity and extremely long battery life. The amplifier is sensitive to transient and quasitatic DC E-field and the AC background signals. The signals are available simultaneously for processing at the output of the amplifier in a DC and AC coupled channel. The resulting signals are passed to a control system.

REFERENCES:
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patent: 5880627 (1999-03-01), Thiel, V
patent: 6686800 (2004-02-01), Krupka
patent: 6859141 (2005-02-01), Van Schyndel et al.
patent: 6922059 (2005-07-01), Zank et al.
patent: 6968171 (2005-11-01), Vanderhelm et al.

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