SU1449939A1 - Apparatus for measuring electric field intensity - Google Patents

Abstract

This invention relates to electrical measuring technology. The purpose of the invention is to improve the measurement accuracy in the presence of a volume charge. The device contains an electrostatic shield 1, inside of which a string modulating electrode 2 is fixed, and two identical wire measuring electrodes FROM 3.4. In screen I, an electromagnetic unit is fixed, consisting of electromagnets (EM) 5,6 for receiving and exciting vibrations. To achieve the goal, the plane in which the ZM 5 and 6 axes are located is aligned with the plane in which IE 3 :: 4 and modulating electrode 2 are located. The amplitudes of the currents in IE 3 and 4 are proportional to the field being measured, and the currents are in antiphase . Because IE 3 and 4 are connected to the inputs of the entered differential y-l, the resulting signal will be proportional to the value of the measured EO field, while the measurement error due to the presence of volume charge in space is completely eliminated. 2 Il.

Description

The invention relates to electrical measuring technology and can be used to measure the strength of an electric field.

The purpose of the invention is to improve the measurement accuracy in the presence of a volume charge.

Figures 1 and 2 show two projections of a device for measuring the intensity of an electric field.

The device contains an electrostatic screen 1, open on one side for access of the measured electric field, inside which the string modulating electrode 2 is fixed, two identical wire measuring electrodes 3 and 4 are fixed inside the screen 1 parallel to the string modulating electrode 2, E screen 1 is strengthened by an electromagnetic node, consisting of electromagnets of reception 5 and excitation of 6 oscillations arranged in such a way that their axes are perpendicular to the modulating electrode 2 and form with it a plane coinciding with loskostyu measuring electrodes 3 and A measuring electrodes 3 and 4 are connected to the inputs of the differential amplifier (not shown).

The device works as follows.

The electromagnetic node, consisting of electromagnets 5 and 6, ensures the excitation of the oscillation of the ferromagnetic modulating electrode 2 at the fundamental resonance frequency. The modulating electrode 2 oscillates in the plane of the measuring electrodes 3 and 4. When a device is placed in an electric field E, the measuring electrodes 3 and 4 are induced by an electric charge Q К- f Е, where K is a coefficient that takes into account the distortion of the electric field by modulating 2 and 3 4 electrodes.

When the modulating electrode 2 oscillates, a variable component appears in the initiated charges prior to the modulation of the field. For measuring electrodes 3 and 4, it is wound q7- К .fo Ё, (1 + К „. Sinwt) and qy

 -KeoKoO + К 81ПСЛ), where К «is the coefficient of modulation and depends on the oscillation amplitude (С) К 1), (О, where f is the oscillation frequency of the modulating electrode 2, the Current in the measuring electrodes 3 and 4 is equal to respectively

1, 5 .cocosut

 К-Е „- COSG) t + (1)

H 5t -K-e „-K ,, - E.so cosot

-K-Eg-coscot +

-about

(2)

where IQ is the current arising due to the presence of a volume charge, for example, gas ionization. From this it follows that the amplitudes of the currents in the measuring electrodes 3 and 4 are proportional to the field being measured, and the currents themselves are in phase shift, while the current 1. enters relations (1) and (2) with the same sign. Since the measuring electrodes 3 and 4 are connected to a differential amplifier, the resulting signal is proportional to the value of the measured field Eg, and the measurement error due to the presence of a volume charge in space is completely eliminated.

Invention Formula

A device for measuring the voltage of an electric field, including two wire measuring electrodes installed parallel to each other, a modulating string electrode located in the same plane as the wire measuring electrodes in the middle between them, electromagnets of oscillating and receiving a modulating string electrode with axes located in one plane with a modulating string electrode and perpendicular to it, otlnchayuschee so that, in order to improve the accuracy of measuring In the presence of a volume charge, the plane in which the axes of the electromagnets for receiving and exciting oscillations are located is aligned with the plane in which the measuring and modulating string electrodes are located, and the measuring electrodes are connected to the inputs of the introduced differential amplifier.

2.

Claims (1)

Claim A device for measuring the electric field strength, including two wire measuring electrodes installed in parallel against each other = ha, a modulating string electrode located in the same plane as the wire measuring electrodes in the middle between them, electromagnets for receiving and exciting oscillations of the modulating string electrode, the axes of which are located in one planes with a modulating string electrode and perpendicular to it, characterized by the fact that, in order to increase the measurement accuracy at unlike a space charge, the plane in which the axes of the electromagnets for receiving and exciting oscillations are located is aligned with the plane in which the wire measuring and modulating string electrodes are located, and the wire measuring electrodes are connected to the inputs of the introduced differential amplifier. ΖΖ2Ζ /// Λ π /// 777 ^ ////// 2 ////) ^ /// 7777/7 /// Ζ. Fig. ³