Apparatus and method for measuring conducting fluid density

Abstract

The conducting fluid measurement equipment includes probe and control circuit. The probe includes one insulating pipe and two electrodes, the electrodes are inserted transversely into the insulating pipe in the place near one end and connected to the control circuit, and the insulating pipe has the other end connected to reference pressure, which is regulated to make the flow speed of the solution passing by the electrodes similar to local flow speed. The control circuit includes AC source, electrode controlling circuit, rectifier circuit, integrating circuit and signal locking circuit, and the signal the electrodes acquire is processed in the rectifier circuit, the integrating circuit and the signal locking circuit before being fed to computer for data processing. The present invention can measure the density distribution and instantaneous pulse information of conducting fluid and may be used in turbulent flow research of conducting fluid.

Description

technical field [0001] The invention relates to a measuring device and a measuring method for the density of a conductive fluid. Background technique [0002] The density of the fluid in the flow field is usually determined by a certain state method. However, for a conductive fluid, since its density generally changes continuously with the concentration of the dielectric, and the concentration of the dielectric is in one-to-one correspondence with the conductivity, it can be determined by the conductance rate measurement to measure the density of conductive fluids, but there is no relevant report yet. [0003] Conductivity can generally be measured using the traditional bridge method, but because the bridge is time-consuming to adjust, this method is not suitable for flow fields with rapidly changing conductivity. Johnson and Enke (1970) invented an alternating pulse voltage technique [Johnson, D.E., and Enke, C.G., "Bipolar Pulse Technique for Fast Conductance Measurements...

AI Technical Summary

Problems solved by technology

However, for the flow field with non-uniform conductivity, since the resistance between the electrodes is an integral quantity, the signal given by the alternating pulse current technology will include the influence of the surrounding fluid concentration, and the influence is very large, so it cannot be used for non-uniform flow. Fixed-point measurement of field density

This problem is exacerbated in rapidly changing flow fields, so it is not practical to use

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