SU1439478A1 - Method of measuring dielectric characteristics of solid materials - Google Patents

Abstract

The invention relates to methods of dielectric monitoring And can be used to solve the imipoKoro class of problems of determining the dielectric properties of materials in various fields of the national economy. The purpose of the invention is to improve the measurement accuracy. In the method of measuring the dielectric characteristics of materials, the electrodes of a capacitive surface transducer in the form of flat parallel strips are installed on the plane of the object to be measured, connected to the secondary cross-connected measuring winding of a transformer, voltage is applied to its primary winding; measure the value of the current flowing through it and determine the dielectric characteristics according to the measurement results. In case of realizing the cumulative measurements, for the installation of electrodes, an even number of points symmetrically located about the axis orthogonal to the plane of the object of measurement are used. The number of turns of each section of the secondary winding of the measuring transformer is chosen from the lf condition g, n, i s; n; 5 ... ... bc, p, where, 2, ..., k, cj is the capacity of the i-th pair of electrode strips symmetrically located relative to the axis of the orthogonal plane of the measurement object, n- is the transformation ratio to the primary winding of the winding sections between the i-th - a pair of electrodes. 2 Il. tf (L. s: 00 from 4 -J 00

Description

The invention relates to methods of dielectric monitoring and can be used to solve a wide class of problems of determining the dielectric properties of materials in various fields of the national economy.

The purpose of the invention is to improve the measurement accuracy.

The method is carried out as follows.

: Electrodes of a capacitive surface-mounted transducer: in the form of flat parallel strips, installed on the plane of the measurement object, connected to the secondary sectioned winding of the measuring transformer, voltage is applied to its primary winding, I register the current flowing through it. I The electrodes are set in an even I number of points located symmetrically with respect to the axis of the orthogonal plane of the object of measurement. In case of cumulative measurements, an adaptive measuring instrument, selecting the number of turns of sections of the secondary winding of the measuring transformer, proceeding from

,with

. .B ... with,; P) b.

p.- 1

eleven; K-l K-1

where i 1, 2, .. ,, k,

the capacitance of the i-th pair of electrode strips symmetrically located about an axis orthogonal to the plane of the measurement object

the transformation ratio in the primary winding of the windings of the sections between the i-th pair of electrodes ..

. On . 1 shows a diagram of a capacitive converter that implements the proposed method; 2 is a function of the charge distribution.

The capacitive overhead converter contains an even number of flat parallel electrode strips 1, each of which is connected to the secondary winding of the measuring transformer 2. The primary winding of the transformer is the output of the converter. Electrode strips 1 pairs ... i k are located symmetrically relative to the axis orthogonal to the plane of the measurement object. The numbers of electrode pairs are counted from the axis of symmetry. That is, between the first electrode strips (the interelectrode distance is minimal, for k-x () is maximum.

The secondary winding of the measuring transformer 2 is partitioned and its 8ODY (according to the number of electrode strips) are connected to the corresponding measuring strips 1. The ratio of the turns of the sections relative to the primary winding — the transformation ratios are selected when implementing cumulative method measurements.

The device works as follows.

Electrode strips 1 are placed on the object to be measured symmetrically to the axis of the orthogonal plane of the object, on which they overlap.

A variable voltage is applied to the primary winding of the converter. Selection of the number of turns and transformation ratios (nj) of individual sections makes it possible to achieve such a distribution of charges on the electrode voltages, such that the field is close to a uniform, ranging from the k-ro electrode to the axis about which the electrodes are symmetrical (Fig. 2).

Creating a floor of such a configuration makes it possible to increase the accuracy of measuring the dielectric properties of materials.

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Claims (1)

Invention Formula 0 five 0 A method for measuring the dielectric characteristics of solid materials, which implies that the electrodes of a capacitive surface transducer in the form of flat parallel strips are mounted on the plane of the object to be measured, connected to the secondary sectioned winding of the instrument transformer, apply voltage to its primary winding, measure the current flowing the dielectric characteristics are determined by it according to the measurement results, characterized in that, in order to increase the accuracy, kupno measurement electrodes are used for setting an even number of points, disposed symmetrically relative to the axis 5 ortho- gonal measuring object plane and the number of turns of each section of the measuring transformer secondary conditions are selected from 9k 9 9 / Figg and -f