SU573774A1 - Solid dielectrics,dielectric constants measuring cell - Google Patents

Description

(54) CELL FOR MEASUREMENT OF DIELECTRIC PARAMETERS OF SOLID DIELECTRICS

The invention relates to radio engineering, in particular, to the measurement of dielectric constant and loss tangent, and can be used with non-destructive methods to control dielectric materials and products.

A known cell for measuring the dielectric parameters of solid dielectrics, comprising a cylindrical resonator with coupling holes and a coaxial hole for introducing the sample l.

However, this device is characterized by the need to measure the geometric dimensions of the sample, which significantly reduces the accuracy of determining the dielectric strength and the tangent of the angle and, moreover, is associated with the complexity, long duration and laboriousness of determining the calculated ratios of the parameters.

The purpose of the invention is to "improve the accuracy of ns 4 rises while accelerating the measurement process

Scientific research institute

For this purpose, a cell for measuring the dielectric parameters of solid dielectrics containing a cylindrical resonator with

openings of communication and coaxial opening for sample introduction, the cylindrical resonator is made with an additional hollow metal bar coaxially attached to the end of the cylindrical resonator, while the height of the hollow metal cup is equal to the height of the cylindrical resonator

i 4E

""

Ii i. U

Do,

2 i Bmn

where B is the diameter of Ø1 cylindrical resonator filled with a medium with dielectric constant E;

B is the diameter of a hollow metal cup filled with a medium with a D11 electrical permeability W a and W c, are the roots of the Bessel function, which determine the distribution of fields in the corresponding resonators.

The drawing shows the proposed cell.

Claims (1)

The cell for the dielectric parameters of solid dielectrics contains a tsipindric resonator 1 CDj.) With coupling holes and a coaxial hole (d) for introducing the sample. The cylindrical resonator 1 is made with an additional hollow metal cup 2 (Sj.) Coaxially attached to the end of the cylindrical resonator 1, with the dimensions of the cylindrical resonator 1 and the hollow metaple. Cup 2 is chosen from the condition that the resonant frequencies are equal before the dielectric under study is introduced. A cylindrical resonator 1 and a hollow metal cup 2 (each) are filled with fluids with different dielectric permittivity coefficients ((I € 2) and small dielectric losses (for example, one medium can be air and the other is non-polar). thus, that the field distributions in the cylindrical resonator 1 and in the hollow metal cup 2 are symmetrical with respect to the dielectric under study. The sample under study is introduced into the region with the same law Regardless of the geometrical dimensions of the sample under investigation, to determine its dielectric penetrability () and loss tangent (tff), it is sufficient to measure the frequency increment Di, and the loaded Q-factors D and The proposed cell allows you to create instruments with a direct reading of the measured parameters S and to, which: increases the efficiency of j testing of dielectric materials and products, and can be used to identify opaque materials of quantum electronics, dielectric crystals and control quality of finished dielectric products. DETAILED DESCRIPTION A cell for measuring dielectric parameters of solid dielectrics, comprising a cylindrical resonator with a coupling hole and a coaxial opening for introducing a sample, in order to improve the measurement accuracy while accelerating the measurement process, the cylindrical resonator is made with an additional hollow metal a glass coaxially attached to the end of a cylindrical resonator, with the height of the hollow metal cup being equal to the height of the cylindrical resonator, and the ratio of their diameter to trench where D - diameter of the cylindrical rezonagtora filled with a medium with dielectric constant &. diameter of a hollow metal filled medium with a dielectric, glass. which permeability "; Pcs pi Birfn are the roots of the Bessel function, which determine the distribution of the fields in the corresponding resonators. Sources of information received during examination: 1. Brandt A.A. Study of dielectrics at ultrahigh frequencies. M., Fizmatgiz 1963, p. 88-128.