SU972377A1 - Hasp capacitor - Google Patents

Description

(54) SUPPLY CAPACITOR

The invention relates to a measurement technique and can be used to measure the dielectric properties of materials.

A capacitive sensor is known, consisting of a whole series of capacitors interconnected by a hinge joint, and stabilizing the variable compensating electric field of the superimposed condenser by making corrections according to a correction graph or table after measuring the capacitance of the overhead capacitors with standards used only for one curvature radius of the controlled surface 1.

However, the capacitive sensor has a large laboriousness of measurement and the need for a large number of standards with different curvature and low accuracy.

The closest in technical solution to the present invention is an invoice measuring capacitor, c. holding flexible conductive electrodes mounted on a film of dielectric material. A capacitor is applied to the monitored product so that the electrodes are directed perpendicularly forming the monitored cylindrical surface, pressed against it, and the capacitance of the filled capacitor is measured. The out-of-work capacitance of this capacitor is measured after fixing.

10 position the electrodes and remove it from the surface of the material being monitored. The dielectric characteristics are calculated from the known dependencies m 2.

Although compared with the known capacitor, this capacitor has several advantages, for example, the rejection of a large number of standards, but it does not eliminate other drawbacks of the analog.

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

Claims (2)

The goal is achieved by the fact that in the non-operating electric field of a patch capacitor containing flexible conductive electrodes fixed on a film of dielectric material, an additional flat electrode rigidly fixed on the base is inserted, the configuration and external dimensions of which are similar to the main electrodes and located , determined from the condition 11 tlQ 11, where 1i (j is the distance from the main electrodes without controlled material to the additional electrode; h is the maximum bending of the main ones. electrodes, corresponding to the radius of curvature of the controlled material; - the depth of the control zone; Fig. 1 shows a capacitor; Fig. 2 is a graph showing the variation of the capacitance C of the empty surface oscillator from the distance (curve 6) and capacitance C of the compensating capacitor (curve 7) The capacitor contains a flexible dialectic film 1, fixed prisms 2, electrodes 3, additional electrode 4, springs 5. The introduction of an additional electrode into the non-operating electric field is an overlap. whom the capacitor allows to achieve the goal as follows. The capacity of the empty surface-mounted capacitor C (Fig. 2) varies depending on its bend and depends on the distance of its center to the additional electrode (curve 6). The capacitance between the additional electrode and the electrodes of the surface capacitor Co varies depending on the distance of the center of the surface capacitor and the additional electrode in accordance with curve 7. By measuring the capacitance C2, you can determine the capacity of the empty surface capacitor by filling it with the measured material. . Therefore, by measuring the capacitance of an on-capacitor and determining the capacitance of a flat capacitor with one installation of a bone sensor per test material, the dielectric characteristics of the material are determined by known dependencies. The sensitivity of the sensor depends on the distance of the surface capacitor to the stationary electrode. It decreases with distance, and this distance depends on the radius of curvature of the material being monitored. In addition, the dimensions of the electrode are determined by the local before the specified control area and the radius of curvature of the material being monitored, with 0 (D I I where sensitivity is maximum at l. All measurements can be automated, therefore, using the proposed capacitor, one can determine the dielectric characteristics from one installation, t Do not fix the electrodes, remove it from the material being monitored and measure its capacity, which greatly improves the measurement accuracy, speeds up the control process and extends the Its application in automated control systems. Formula of the invention Invoice capacitor containing flexible conductive electrodes fixed on a film of dielectric material, characterized in that, in order to improve measurement accuracy, it is equipped with an additional flat rigidly fixed electrode on the base, configuration and external whose dimensions are similar to the main electrodes, and located at a distance determined from the condition 2 11 where tiQ is the distance from the main electrodes without controlled material before the additional electrode; ti is the maximum bending of the main electrodes, corresponding to the radius of curvature of the material under test; n depth control zone. Sources of information taken into account in the examination 1. I. Matis I. Electrical capacitive converters for non-destructive testing. Riga, Knowledge, 1978, p. 57. 2. USSR author's certificate number 372515, cl. G, OiN 27/26, 1971 (prototype).