SU1501182A1 - Electrokinetic converter - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to electrochemical information converters, and can be used to measure fluid flow and pressure drop in various fields of science and technology. The aim of the invention is to simplify the design of the converter. In the presence of a flow of working fluid in the housing 1, the flow of ions of a certain sign is carried out from the transforming partition 2 into the zone of the electrodes 3. The excess of ions in the flow is due to the electrokinetic effect that occurs on the conversion septum due to the displacement of the diffuse part of the electrical double layer. The presence of an excess of ions reduces the resistance between the electrodes 3, which leads to an increase in the current in the circuit of an alternating voltage source 4. The increase in current is detected by a current meter 5, which can be made on the basis of a differential current amplifier with a low input resistance. 3 il.

Description

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The invention relates to the measurement technique, in particular, to electrical information converters, and can be used to measure the pressure drop or flow rate in various fields of science and technology.

The purpose of the invention is to increase the sensitivity and reduce energy consumption.

Figure 1 shows the first version of the electrokinetic converter using two partitions; Figures 2 and 3 show a second variant of an electrokinetic converter using two pairs of electrodes, respectively, with a parallel and a di (}) differential switch-on circuit of electrodes.

The electro-kinetic converter consists of a housing 1 filled with a working fluid, in which a transducer partition 2 is installed, dividing the housing into two chambers. The electrodes 3 are placed in the first chamber and connected to the source 4 of the alternating voltage 4 in series with the current meter 5,

In the first embodiment, a second partition 6 is installed in the first chamber. In the second embodiment, additional electrodes 7 are installed in the second chamber, connected either in parallel to electrodes 3 or by a differential circuit.

Electrokinetic Converter works as follows.

In the presence of a flow of working fluid, caused by a pressure drop on the conversion wall 2 or 2 and 6, the flow of charged ions of a certain sign is carried out from the first chamber to the second. Availability of

ka ions are caused by the electrically-induced effect: ja due to the displacement of the di (1) fuz part of the electric double layer. When this flow reaches the electrode zone 3, the resistance between the electrodes decreases and the current in the circuit increases, which is fixed by the current meter 5. The application of the alternating voltage source 4 reduces the measurement error by eliminating polarization of the electrodes, and also ensures the use of an AC amplifier, possessing the best metrological characteristics. The inclusion of electrodes 3 and 7 to a differential amplifier with low input impedance, according to the differential scheme, increases the sensitivity of the conversion.

Claims (1)

25 claims Electrokinetic converter. A housing filled with working fluid, divided by a conversion wall into two chambers, and one pair of electrodes placed in a first chamber, characterized in that, in order to increase sensitivity and reduce energy consumption, a second partition installed behind the electrodes in the first chamber or second parg: electrodes installed in the second chamber and connected to the circuit of the current meter parallel-. but the first pair of electrodes or a differential circuit, as well as a voltage source, the electrodes being installed parallel to the transforming partition. G - F 7 headlight.2 V /