Conductive probe liquid holdup gauge

Abstract

The invention relates to a conductive probe liquid holdup gauge, which comprises a signal generator, a probe and a signal processor, wherein a high-frequency sine wave signal is outputted by a signal generating integrated circuit in the signal generator and a high-frequency signal is supplied to the probe after the power of the high-frequency sine wave signal is amplified by an audio power amplifier; the signal processor is serially connected in a loop formed by the signal generator and the probe; a detected high-frequency alternating-current current signal is transmitted into the signal processor by the probe; the alternating-current current signal is converted into an alternating-current voltage signal in direct proportion by a high-speed operation amplifier in the signal processor; and the alternating-current voltage signal is converted into a direct-current voltage signal having the same effective value with the alternating-current voltage signal by an alternating-current valtoge to direct-current effective value converter in the signal processor, and then the direct-current voltage signal is transmitted to a data acquisition card for being collected and analyzed. By using the conductive probe liquid holdup gauge, the interference of the probe capacitive reactance component can be restrained and the precision of measuring stability of liquid holdup can be increased. The conductive probe liquid holdup gauge can be widely applied to the gas-liquid ratio measurement in two-phase flow pipeline.

Description

technical field [0001] The invention relates to a liquid holdup measuring device, in particular to a conductivity probe liquid holdup measuring instrument for indicating the gas-liquid ratio in a two-phase flow pipeline. Background technique [0002] At present, the probe method liquid holdup measurement equipment that has been used locally is mainly composed of a signal generator, a pipe section containing a probe, a signal processing circuit and then connected to a data acquisition card. All the signal generators mentioned in the literature use off-the-shelf function generators available on the market, which are expensive, large in size, and low in load capacity. It is often necessary to reduce the operating frequency to increase the impedance of the probe and reduce the load. . However, the conductivity of water determines that after the frequency decreases, the capacitive reactance component increases. At this time, forcibly treating it as pure resistance will increase ...

AI Technical Summary

Problems solved by technology

However, the traditional processing method has relatively strict requirements on the frequency of the signal source. The change and instability of the frequency will affect the rectifier circuit that has been debugged. The anti-interference ability to the signal source and the line is relatively poor, and the output DC signal is unstable. large disturbance

In addition, the difference between the too low frequency and the changing frequency of the multiphase flow is too close, coupled with the signal processing circuit with poor anti-interference, it is difficult to balance stable output and fast response speed with traditional filtering methods

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