SU1056080A1 - Electric field strength meter - Google Patents

Abstract

ELECTRIC FIELD VOLTAGE SENSOR, contents located in a grounded metal case converter of an electric field into a pulse signal, made in the form of two electrodes and a conductive particle dispersed between the electrodes in a dielectric medium, screen mounted between the controlled electric field and the converter and kinematically connected with the mechanism displacement, a frequency signal pickup resistor connected to the output of the converter is different from that in order to increase the accuracy and the representation of the measured parameter, the screen is made in the form of two rotary insulated metal plates fixed on the axis of the movement mechanism with the possibility of alternate contact with the measuring electrode of the body and the body, the latter providing a cover on the side of the controlled electric field shielding the plates during their contacting .

Description

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The invention relates to electrical measuring machinery and is intended for use in the study of electric fields created, for example, by electrostatic charges.

A known electric field strength sensor, comprising a measuring plate connected to an AC current pickup resistor, is provided with a metal screen mounted between the controlled electric field and the measuring plate and the kinematics associated with the displacement mechanism l.

The disadvantages of the known device are limited operational reliability due to the use of a high-speed displacement mechanism, significant difficulties in using automatic control systems due to the amplitude modulus of the output signal, and low noise immunity.

The closest technical solution to the invention is an electric field strength sensor containing an electric field converter into a pulse signal made in a grounded metal case made in the form of two electrodes and a conducting particle placed between the electrodes in a dielectric medium, a grounded metal screen mounted between controlled by the electric field and the said transducer and kinematically associated with the movement mechanism, the resistor signal connected to the output of the converter

The disadvantage of this device is the low accuracy of the display of the intensity of the electric field due to incomplete drainage of the charge from the measuring electrode of the converter during its periodic shielding by a movable screen, which is carried out in order to avoid the appearance of saturation.

The aim of the invention is to improve the accuracy of the representation of the measured parameter by such a sensor.

This goal is achieved by the fact that in the electric field strength sensor, which contains an electric field converter into a pulse signal, made in the form of two electrodes and a conducting particle placed between the electrodes in a dielectric medium, a screen mounted between controlled electric field and the mentioned

a transducer and kinematically connected with the movement mechanism, a frequency signal removal resistor connected to the output of the converter, the screen is made in the form of two rotating insulated metal plates fixed on the axis of the movement mechanism with the possibility of alternate contact with the measuring electrode

0 converter and housing, and in the latter provides a cover from the side of the controlled electric field, shielding the plate during their case contacting.

five

The drawing shows the sensor of the electric field intensity, the general view,

In the grounded metal housing 1 are located converter

0 electric field to a pulse signal, made in the form of two electrodes 2 and 3. And a conductive particle 4 placed between them in a dielectric medium 5, a screen made in the form of two rotary insulated metal plates 6 to If fixed on the axis of the movement mechanism 8 with the possibility of alternating contacting via contacts 9 and 10 with electrode 2 and housing 1, resistor 11 for removing the frequency signal connected to the output of the converter between electrode 3 and housing 1.

5 last provides a cover on the side of the controlled electric field, shielding the plates b and 7 with their case contacting.

The operation of the device occurs.

0 as follows.

In the initial position, when the electric field intensity is measured, the plate b is connected through contact 9 to the electric converter 2. With a negative field on the electrode 2 on the side facing the conductive particle 4, an excessive negative charge is formed under the action of

0 of which particle 4 begins to oscillate and transfer charges before equalizing the potentials.

electrodes 2 and 3.

I. . After moving the thriller

5 of the charge, the particle 4 stops oscillation, and on the electrode 2 there remains an excess positive charge. As the plates b and 7 rotate (rotate, the next moment

The neutral plate 7 approaches the electrode 2, which, due to the direct connection through the contact 10 with the electrode 2 and the action of the controlled electric field, neutralizes the excess one.

positive charge of the electrode 2. At the same time, the plate 6 enters the area of the housing 1, shielded from the floor, and is grounded through pin 9. At the same time, the balance of the charges present on it is restored. If plate B was not shielded from the floor by grounding, then the excess positively induced charge induced by the field would continue to exist on it. With a subsequent rotation of plate 6 and 7, the places were reversed. The plate b perceives the action of the controlled electric field, and the plate 7 charged with excess positive charge enters the area of the housing 1 where the field does not affect. Through pin 10, it is grounded and an excess charge flows to the ground.

Thus, due to the exclusion of residual charges on the measuring electrode, the accuracy of the converter and the sensor as a whole increases significantly.

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The output signal of the sensor, down from resistor 11, has a frequency pattern and is practically unaffected by interference.

11 M M T

Claims (1)

ELECTRIC FIELD VOLTAGE SENSOR, comprising a transducer of an electric field into a pulse signal arranged in a grounded metal case made in the form of two electrodes and a conductive particle placed between the electrodes in a dielectric medium, a screen mounted between the controlled electric field and the converter and kinematically connected with the movement mechanism , a frequency signal pickup resistor connected to the output of the converter, resulting in that,, p. In order to improve the accuracy of the representation of the measured parameter, the screen is made in the form of two rotary insulated metal plates fixed to the axis of the movement mechanism with the possibility of alternating contact with the measuring electrode of the transducer and the housing, the latter provided with a cover from the side of the controlled electric field that shields the plates during their case contact .