Apparatus for detecting and measuring an electrostatic field

Details Apparatus for detecting and measuring an electrostatic field Apparatus for detecting and measuring an electrostatic field

1978-11-24

1980-09-09

Tokar, Michael J.

Electricity: measuring and testing

Electrostatic field

Using modulation-type electrometer

G01R 528

Patent

active

042220076

ABSTRACT:
Apparatus for detecting and measuring an electrostatic field is disclosed which includes two sensing plates and a rotary blade that is rotated to move over the sensing plates to vary the amount of area of each of the sensing plates exposed to an electrostatic field being measured. A particular width and a particular arrangement of the sensing plates are used for producing a non-symmetrical electric output signal with a repetitive wave-form having a reversal of the peaks in each half-cycle. The dissymmetry of the peaks indicates field polarity information and the amplitude indicates field intensity information. Each sensing plate has a non-linear varying width that decreases from a wide end to a narrower end to develop distinctive characteristics in the wave-form. A resistor is connected across the sensing plates, the resistor having a center tap on the resistor that is connected to ground and the voltage signal across the resistor resulting from a field on the sensing plates is applied as an input signal from the difference amplifier producing an output signal that is a measure of the polarity and intensity of the electrostatic field. The output signal is applicable to a variety of indicator devices including digital voltmeters, lamps, buzzers, and microprocessor units.

REFERENCES:
patent: 2993165 (1961-07-01), Jauch
patent: 4055798 (1977-10-01), Kato

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