Liquid detection device, liquid detection method and liquid detection system

Abstract

The invention discloses a liquid detection device, which comprises a capacitance detector, a current detector and a processor, wherein the capacitance detector comprises a detection end and a receiving end, capacitance is formed between the detection end and the receiving end, the capacitance detector can move relative to liquid, and when the detection end is contacted with the liquid, current canbe formed; the current detector is configured to be electrically connected with the capacitance detector for detecting the current of a loop of the capacitance detector; and the processor is configured to be electrically connected with the current detector for analyzing the change trend of current detected by the current detector in a predetermined time and judging the moving state of the liquiddetection device relative to the liquid. The electricity storage characteristic of the capacitance is used, when the charge at one capacitance pole changes, a current characteristic is generated in the capacitance loop, and the position of liquid or other object with a conductive characteristic is judged.

Description

technical field [0001] The invention belongs to the technical field of automation equipment, and in particular relates to a liquid detection device, a liquid detection method and a liquid detection system. Background technique [0002] Liquid detection technology has always been the core technology of automation equipment, and it has developed rapidly in recent years. Among them, the most widely used are pressure detection technology and capacitive detection technology. Compared with pressure detection technology, capacitive detection technology has the advantages of small equipment size, easy to realize long-distance transmission and adjustment, and is suitable for liquid measurement of corrosive and high-pressure media. [0003] At present, common capacitive liquid detectors measure the position of liquid by measuring the change of capacitance. It uses a metal rod inserted into the container of liquid, at this time the metal rod acts as one pole of the capacitor, and the...

AI Technical Summary

Problems solved by technology

[0005] However, existing capacitive liquid detectors have more limitations

First of all, its sensitivity is difficult to control. The sensitivity of existing capacitive liquid detectors mainly depends on the difference between the dielectric constant of the liquid and the gas above the liquid, and only when the dielectric constants ε1 and ε2 are constant can the liquid position measurement be guaranteed. precise

Secondly, because the measured medium is mostly conductive, the metal rod electrode is covered with an insulating layer, so it does not have a good detection ability for objects with weak conductivity.

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