Device and method for detecting water level

A water level detection and water level technology, which is used in measuring devices, liquid/fluid solids measurement, liquid level indicators for physical variable measurement, etc., can solve the problems of high cost, complex circuit, poor measurement accuracy, etc. The effect of high precision and simple structure

Inactive Publication Date: 2017-05-31
GUANGDONG POLYTECHNIC NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of high cost caused by mechanical devices or complicated circuits and poor measurement accuracy by multi-point probes in the prior art, and provide a method with simple structure, Water level detection device with high measurement accuracy

Method used

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  • Device and method for detecting water level
  • Device and method for detecting water level
  • Device and method for detecting water level

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: as figure 2 As shown, this embodiment provides a water level detection device, comprising:

[0039] The first resistor R1 is set between the charging terminal 11 and the detection terminal 21;

[0040] The capacitance probe K is arranged in the container 100 to be tested. In this embodiment, one end of the capacitance probe K is connected to the detection terminal 21, and the capacitance probe K and the ground respectively constitute two poles of a detection capacitance C1; The air and / or the liquid to be measured between the capacitance probe K and the ground are the medium of the detection capacitance C1 (when the container 100 is empty, the medium is air, and when the container 100 is full or the liquid to be measured in the container covers a part For capacitance probe K, the medium is air and the liquid to be measured).

[0041] A charging module 1, connected to the charging terminal 11, for charging the detection capacitor C1;

[0042] A detectio...

Embodiment 2

[0046] Embodiment 2: as image 3 As shown, in this embodiment, the charging module 1, the detection module 2, and the timing module 3 are all implemented by an MCU; for example, the above functions are simultaneously implemented by the same MCU, that is, at least one pin port of the MCU is configured as a charging output port ( image 3 GPIO1 port in ) and connected to the charging terminal 11, at least one pin port of the MCU is configured as a high-level interrupt trigger port ( image 3 GPIO2) and connected to the detection terminal 21, when the charging output port GPIO1 starts to output charging pulses (such as 5V step pulses), the timing module 3 in the MCU starts timing until the detection terminal 21 detects After a high level (such as any value in 3.5V~5V), an interrupt is triggered, and the timing module 3 stops timing, and records the time in the memory, and then obtains the water level height data according to the pre-calibrated time-water level comparison table. ...

Embodiment 3

[0048] Embodiment 3: as Figure 5 As shown, this embodiment provides the method flow for detecting the water level using the water level detection device provided in Embodiment 2, including the following steps,

[0049] Calibration stage: After the length of the capacitance probe is determined, the time-dielectric constant (capacitance) correspondence relationship is tabulated and stored in advance; after the capacitance probe is installed in the container to be tested, according to the actual placement position of the capacitance probe in the container to be tested , calibrate the corresponding relationship between the charging time and the water level, formulate a time-water level comparison table (in some embodiments, it can also be a time-capacitance-water level comparison table), and store the table in the storage module.

[0050] When calibrating, at least zero water level and full water level should be calibrated; it should be noted that the zero water level here does n...

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Abstract

The invention relates to the field of automatic water level detection, in particular to a device and a method for detecting water level. The device is characterized in that a capacitor probe is arranged in a to-be-detected container, and the capacitor probe and ground are arranged into a detection capacitor; a medium of the capacitor consists of air and/or to-be-detected liquid; a real-time capacitance value of the detection capacitor is obtained by detecting capacitor charging time of an RC circuit comprising the detection capacitor, so as to further obtain a water level value of the to-be-detected liquid. The detection device has the advantages that the structure is simple, any water level can be continuously detected, and the detection accuracy is very high.

Description

technical field [0001] The invention relates to the field of automatic water level detection, in particular to a water level detection device and method. Background technique [0002] In the prior art, probe detection technology is mostly used for water level detection. In this detection method, it is necessary to select points to be detected at each height of the area to be detected, and set up probes at each point, and then detect each probe separately. , so as to obtain the information of the water level height. This detection method needs to detect all the probes for each detection, and the detection accuracy of the probes is affected by the installation position and density of the probes, and no matter how high the installation density of the probes is, theoretically Continuous monitoring of arbitrary water levels cannot be achieved. In the prior art, there are still some cases where a mechanical water level detection device is used, but this detection method has probl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/26
CPCG01F23/266G01F23/268
Inventor 刘克江王介宏庄伟锐庄少开吴旭波林泽豪林仕灿蔡堉伟
Owner GUANGDONG POLYTECHNIC NORMAL UNIV
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