SU1392482A1 - Method of measuring electric conduction of gas medium - Google Patents

Abstract

The invention relates to methods for dynamic measurement of parameters of gas media and can be used in geophysical, meteorological and space research. The aim of the invention is to improve the measurement accuracy by eliminating the appearance of residual charge accumulating on the scattering body. By the rate of change of charge on a body placed in a conducting medium, the electrical conductivity is indirectly determined. For this, the body is given an initial charge and, when it falls to a value of a given level, the comparimants apply a charge of opposite polarity, the value of which is equal to the sum of the initial charge and charge of the reading level. Next, the charge-discharge cycle is periodically repeated. 2 Il. g (L

Description

D) Y 4 ;: X

uh

The invention relates to methods for studying the electrical properties of gaseous media and can be used in geophysical, meteorological, space research, and in environmental control systems.

The aim of the invention is to improve the accuracy of measuring the electrical conductivity of the gas medium.

FIG. 1 is a schematic diagram of a device implementing a method; 2, the change in charge over time on a conductive body.

The device contains a spherical working electrode I, a feedback electrode 2, an amplifier-comparator 3, a regulator 4 of the reference potential, a charge recorder (not shown).

The method is implemented as follows.

An electrically conductive body, for example, an electrode structure of a spherical shape shown in FIG. 1, is placed in the gaseous medium under study, Electrode 1 forms a scattering body, i.e. the body from which the charge flows into the environment. Using electrode 2 due to the effect of electro-. static induction is applied to the electrode 1 by an initial electric charge of the non-color -Qj. This charge is dissipated in the atmosphere, and the potential of the electrode decreases, approaching the magnitude of

n

3924322

The measurement process is cyclically repeated. The magnitude of the charge Q, corresponding to the threshold of comparing, is chosen from the condition

Qo Qrv, -

Qo 2

where QQ is the initial charge value; Q is the charge value corresponding to the level of comparability.

The value of electrical conductivity is determined by the results of indirect measurements of the charge and the time of the fall of charge to a certain level by the formula

G

t, - t,

In

(

Qe

2 QH, - Qo

Where

EO dielectric constant

vacuum; tg Ht, - feed times

the initial charge and the charge of the opposite polarity,

Claims (1)

30 claims A method for measuring the electrical conductivity of a gaseous medium, which consists in introducing electrically not set by the regulator 4. This potential corresponds to the charge Q (see Fig. 2). At time t, the potentials at the inputs of the comparator 3 are compared, and the electrode 2 is supplied with a charge of opposite polarity corresponding to the magnitude of the induced charge equal to the sum of the initial charge and the charge of the reading level. In this case, the total charge of the electrode 2 is about equal to -Q. Then, the volumetric charge of negative polarity flows, and when the value of -Q, which is the second reading level, is reached, the charge of the initial polarity is fed, the value of which is equal to the sum of the initial charge and charge of the second reading level, i.e. the circuit is transferred to the inverse state. a spherical body, periodically informing it of the initial electrically charged charge of a known value, measuring the time when the charge decays to a selected reference level, determines the rate of change of the charge value, according to which the magnitude of the electrical conductivity is measured, in order to increase the measurement accuracy, when the charge level of the reading level is reached, the body is charged with the opposite polarity, the value of which is equal to the sum of the initial charge and charge of the reading level, and upon reaching the value of charge cerned measuring indicator layer serves original charge polarity, the magnitude of which is equal to the sum of the initial charge and the second charge level measuring indicator. 1 Q Oo Qm to tm Qo -Q (Rig.y.