SU930125A1 - Measuring electrode for diffusion converters - Google Patents

Description

(AOR MEASURING ELECTRODE FOR DIFFUSION CONVERTERS

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The invention relates to a measurement technique, in particular, can be used as a measuring electrode (cathode) in diffusion converters of mechanical signals intended for recording accelerations, velocities, soil, pressure drops, etc.

A measuring electrode for diffusion converters is known, which is a hollow shell made of an inert metal (tantalum), having an insulated external surface filled with a porous conductive mass, such as tantalum carbide, and containing holes for electrolyte input and output (iodine-iodide) 1.

A disadvantage of this device is the complexity of the manufacturing technology.

The closest to the invention to the technical essence is from

A measuring electrode containing a measuring channel, made in the form of a cavity inside an electrically conductive material inert to the electrolyte, located between the end surfaces of the inserts with the holes in the center around the periphery of t2j.

The drawbacks of the device are the complexity of manufacturing and the lack of reliability in operation, due to the fact that the dimensions of the working cavities are limited by washers, the thickness of which determines the upper frequency limit of the converter. Due to the passivation processes, the fluidity of the material, changes in the ambient temperature, the washers are able to change their thickness, which leads to a change in the characteristics of the converter.

Claims (1)

The purpose of the invention is to simplify the manufacturing technology and increase the reliability of the electrode. The goal is achieved by the fact that in a measuring electrode for diffusion converters containing a measuring channel made in the form of a cavity inside an electrically conductive material inert to the electrolyte located between the end surfaces of the inserts with holes in the center and on the periphery of the measuring channel formed by this non-through surface openings of one insert and the internal end surface of another insert, hermetically pressed one inside the other, made of the same material and having It is an electrical contact, and the outer surfaces of the inserts are covered with an electrically insulating layer. FIG. 1 shows a measuring electrode in section; in fig. 2 - times cut AA in FIG. on fig.Z - section bb in fig, 1. An insert 1 made of an inert metal, such as titanium, whose surface is covered with a non-conductive layer, such as titanium dioxide 2, contains a central blind hole 3, in the bottom of which there is a hole t for input / output electrolyte (iodine-iodine) . Into the central blind hole 3, the insert 5 is hermetically pressed in, made of the same material and having 1 electrical contact with the insert. The outer end surface of the insert 5 is covered with a nonconducting layer of titanium dioxide, and its lateral and inner end surfaces are insulated. On the periphery of the insert -5 with; Holds a system of holes 6 for inlet / bypass) electrolyte. The bottom surface of the nonstandant hole 3 of one insert 1 and the inner end surface of the other insert 5 surround the measuring channel in the form of a cylindrical cavity. At the ends of the measuring channel, a film working layer 7 made of platinum-group metal was deposited, for example, by vacuum spraying. A current collector 8 is connected to the surface of the insert 1, having an electrical contact with the layers 7, which functions as a reading electrode. The measuring electrode works in the following way. The electrode is connected to the negative pole of a constant voltage source (not shown). After switching on the power source in the electrode circuit due to the diffusion of electroactive ions between the layers 7, a stationary initial (background) current is established. In the presence of an external mechanical action, such as acceleration, an additional, convective flow of the same ions is superimposed on the diffusion flux of electroactive ions. This leads to an increase in the output current of the electrode. The difference between the output current of the electrode and its initial current serves as a measure of the external mechanical action. The measuring channel, having the form of a flattened cylinder with a hole in the center on one and holes on the periphery on the other ends, is a radial gap that increases the sensitivity of the diffusion converter 10 times and increases the upper limit of the working amplitudes of the detected signal. This is due to the fact that The hydrodynamic resistance of the radial gap with a large cross-sectional area decreases significantly and the diffusion process is accelerated. In the proposed measuring electron, the characteristic dimension of the measuring channel is determined by the hermetic insertion of the insert one into the other, which ensures the simplicity of the electrode assembly technology and its operation without significant changes in characteristics. DETAILED DESCRIPTION OF THE INVENTION A measuring electrode for diffusion transducers containing a measuring channel made in the form of a cavity inside an electrically conductive material inert to the electrolyte, which is located by the mecdum of the end surfaces of the inserts with openings in the center and on the periphery, characterized in that increase the reliability of operation, the measuring channel is formed by the bottom surface of the non-through hole of one insert and the inner end surface of the other insert; but pressed one into the other, made of the same material and I have