SU1557534A1 - Method of measuring electric permeability - Google Patents

Abstract

The invention relates to the measurement of electrical quantities and can be used to determine the dielectric constant of materials. The aim of the invention is to improve the accuracy and simplify the process of dielectric constant of samples of small size and (or) complex shape. The method consists in placing the measurement object between the electrodes of the measuring capacitor cell, filling the gap between the electrodes and the sample with a dielectric dispersed medium with permeability, which is known to be more permeable to the measurement object, reducing the dielectric constant of the dispersed medium to equal it with the dielectric constant of the measurement object. The goal is achieved by introducing a dispersed dielectric medium, ensuring smooth adjustment of the dielectric constant of the dispersed medium, and fixing the equality of the dielectric constant of the dispersed medium and the object of measurement. 1 il.

Description

The invention relates to the measurement of electrical quantities and can be used in instrumentation to control the dielectric constant of the material of parts of small size and complex shape.

The aim of the invention is to improve the accuracy of R. simplifying the process of measuring the dielectric constant of samples of small size and (or) complex shape

The drawing shows an installation that implements the method

The installation contains an electrode system 1 (the drawing shows a two-electrode flat-capacitor

measuring cell) s placed in the hopper 2, the dispersed dielectric medium 30 is filled up (up to 0.8–0.9 of the bunker volume)

The method is carried out as follows.

Previously, the measurement object 4 is placed in the working volume of the measuring cell (between the electrodes). The dielectric constant of the dispersed medium 6ac is taken obviously greater than the dielectric constant of the object of measurement 6OU. The bunker is installed on the table 5 shaker. When exposed to vibration, the density of the dispersed medium changes: than

t

& e

the greater the amplitude of oscillation, the lower the density of the dispersed medium. The vibration frequency is chosen empirically for each particular dispersion from the requirement to create a uniform density in the volume of the measuring cell.

Thus, with a smooth increase in the amplitude of vibration, the density of the dispersed medium smoothly decreases, and hence its dielectric constant smoothly decreases. To fix the moment of alignment of the b and c values, the same second bin 6 is installed on the same shaker table and the same electrode system 7 and With the same dispersed medium, but without the object to be measured, the alignment moment of 6qc and ω is fixed by the equality of the capacities of the two capacitor cells: with the sample and without the sample. Equality eat 3e

bones of cells means that dds compares with 80ts

The particle size of the dispersed medium is taken much smaller than the object to be measured, which ensures the macrohomogeneity of the dielectric constant of the dispersed medium, as well as reliable

0

five

Q

filling the dispersed medium with potential cavities, holes, recesses, etc. in objects of measurement of complex shape.

Claims (1)

Invention Formula A method for measuring dielectric constant, consisting in placing a test sample between the electrodes of a measuring capacitor cell and measuring the resulting capacitance, which is designed to improve accuracy and simplify the process of measuring the dielectric constant of small samples and / or complex shapes, the gap between the electrodes and the controlled sample and the volume of the model analogous cell are filled with a dielectric dispersed medium with permeability the controlled sample, smoothly reducing the dielectric constant of the dispersed medium until the values of the capacitance of the measuring and reference cells are equal and the dielectric constant is determined from the capacitance of the reference cell.