Dynamic liquid level wireless monitoring method and system

A wireless monitoring and dynamic technology, applied in the direction of engine lubrication, engine components, liquid level indicator, etc., can solve the problem that the dynamic tilt of liquid level cannot be applied, the sensor network system cannot be self-organized, and the monitoring interface lacks a graphical monitoring interface. And other issues

Active Publication Date: 2015-10-28
SOUTH CHINA NORMAL UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0004] (1) Most of them are only applicable to the static liquid level, and cannot be applied to the situation where the liquid surface is dynamically inclined, and the scope of application is small;
[0005] (2) The sensor network system in the measurement system cannot be self-organized, and it is not convenient and fast to expand;
[0006] (3) Most of the remote monitoring interface lacks a graphical monitoring interface, and it is difficult to intuitively present the measurement results for the user, which is not intuitive enough

Method used

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  • Dynamic liquid level wireless monitoring method and system
  • Dynamic liquid level wireless monitoring method and system
  • Dynamic liquid level wireless monitoring method and system

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Embodiment 1

[0106] The entire dynamic liquid level monitoring system of this embodiment mainly includes a data acquisition unit, a control unit, a wireless communication unit, a display unit, a voice broadcast unit and a terminal control unit.

[0107] Among them, the data acquisition unit adopts a plurality of HC-SR04 ultrasonic ranging sensors (this embodiment adopts 3 ultrasonic ranging sensors, and one of the ultrasonic ranging sensors is placed in the middle of the top of the container), which can be used when the liquid tilts left or right or Accurately measure liquid level height while tilting back and forth. The detection range of HC-SR04 ultrasonic ranging sensor is 2-400cm, and the accuracy can reach 0.3cm.

[0108] The wireless communication unit adopts Xbee-S2 module, which is compatible with Zigbee technology and can be set to point-to-point or transparent communication. The front-end display unit is a 2.8-inch ALIENTEK TFT-LCD module from ALIENTEK Company, which is used to ...

no. 2 example

[0113] The present invention can realize liquid level dynamic measurement, when the liquid tilting situation is such as Figure 6 In the case of left tilt as shown (at this time, the three sensors are located on the same horizontal straight line), the real height of the liquid level can be accurately known through the coordination and cooperation of multiple ultrasonic sensors. Ultrasonic sensor 2 is located in the middle of the top of the container.

[0114] From Figure 6 The calculation formulas of AB and BC can be obtained, in order to simplify the calculation, the present embodiment makes h 3 =h,x 1 =x 2 . The specific calculation formulas of AB and BC are as follows:

[0115] AB=AH+BH=(x×tanα) / 2+h-h 2 ,

[0116] BC=BG+GC=x / 2+cotα×(h-h 2 ).

[0117] Assuming that when the tilted liquid is placed in a horizontal state, the height from the bottom is H, and the width of the container is c, then there will be:

[0118] H×x×c=BC×c×AB / 2

[0119] Therefore:

[0120] ...

no. 3 example

[0125] The present invention can realize the dynamic measurement of the liquid level, when the liquid inclination is such as Figure 8 In the case of the forward tilt shown, the real height of the liquid level can be accurately known through the coordinated cooperation of multiple ultrasonic sensors. Ultrasonic sensor 2 is located in the middle of the top of the container.

[0126] From Figure 7 and 8 The calculation formulas of AB and BC can be obtained, in order to simplify the calculation, the present embodiment makes h 3 = h 1 , x 1 =x 2 =x 3 , x 3 is the vertical distance between two adjacent ultrasonic sensors, such as Figure 8 shown. The calculation process of analogy embodiment two has:

[0127] AB=(y×tanα) / 2+h-h 2 ,

[0128] BC=y / 2+cotα×(h-h 2 ).

[0129] Assuming that when the tilted liquid is placed in a horizontal state, the height from the bottom is H, the length of the container is x, and the width of the container is y, then there will be:

[01...

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Abstract

The invention discloses a dynamic liquid level wireless monitoring method and system. The method comprises following steps: acquiring distance data needed for dynamic liquid level measurement through the cooperation of multiple ultrasonic sensors; calculating the liquid level height through an improved distance difference-gradient algorithm according to the acquired distance data, so that the actual liquid level height can be obtained; sending the calculated actual liquid level height to a remote monitoring terminal through an Xbee wireless manner; and the remote monitoring terminal displays the received actual liquid level height on the graphical interface and broadcasts the actual liquid level height through voice, so that the dynamic liquid level is remotely monitored. According to the invention, the actual liquid level height under a liquid level inclination condition can be accurately measured, and the method and system can be more widely used; the method and the system utilizes ad-hoc network characteristics of an Xbee module, so that the expansion of a sensor network system is facilitated; measuring results can be visually provided for users, and the results are more visual; and the method and the system can be widely applied to the liquid level measurement field.

Description

technical field [0001] The invention relates to the fields of automatic control and electronic communication, in particular to a wireless monitoring method and system for dynamic liquid level. Background technique [0002] Liquid level measurement is widely used in automation, chemical industry, petroleum, sewage monitoring and other fields. Realizing non-contact and intelligent measurement is the current development direction of liquid level gauge. With the development of industry, the application and research of high and new technologies such as computers, microelectronics, and sensors, the development of liquid level instruments has made great progress in recent years to meet the increasingly high application requirements. Among many liquid level measurement methods and measurement systems, the ultrasonic liquid level measurement system with non-contact characteristics has gradually become the mainstream of liquid level measurement. [0003] With the rapid development o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F23/296
Inventor 周国富仇广东罗智杰
Owner SOUTH CHINA NORMAL UNIVERSITY
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