Liquid level fluctuation measuring device, method and liquid storage container

Abstract

This application relates to the field of liquid level measurement technology, and in particular to a liquid level fluctuation measurement device, method, and storage container. The liquid level fluctuation measurement device includes several sets of mesh structures, a signal input unit, and a signal monitoring unit. In each set of mesh structures, several second conductors and several first conductors are arranged in a cross pattern to form multiple liquid level monitoring points. There is a gap between the first conductors and second conductors at each liquid level monitoring point. The signal input unit is configured to sequentially input excitation signals to at least some of the first conductors. The signal monitoring unit is connected to the second conductors and is used to monitor the phase state at different liquid level monitoring point positions. After the signal input unit sequentially completes the input of excitation signals to at least some of the first conductors, the signal monitoring unit can obtain phase state information at different liquid level monitoring point positions, thereby reconstructing the three-dimensional information of free liquid level fluctuations.

Description

Technical Field

[0001] This application relates to the field of liquid level measurement technology, and in particular to a liquid level fluctuation measurement device, method and liquid storage container. Background Technology

[0002] Free surface fluctuations in containers are widespread in various engineering fields, such as the liquid levels in cruise ships under ocean rolling conditions and oil tankers in road transport. Current research on free surface fluctuations mainly focuses on theoretical studies, namely mathematical modeling and numerical analysis. However, because surface fluctuations are inherently a highly nonlinear problem, numerical simulation methods are difficult and have poor accuracy. The few experimental measurements available only monitor the liquid level at local points, failing to accurately capture the three-dimensional surface fluctuations. Summary of the Invention

[0003] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This part of the invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, a first aspect of the present invention provides a liquid level fluctuation measuring device.

[0006] A second aspect of the present invention provides a method for measuring liquid level fluctuations.

[0007] A third aspect of the present invention provides a liquid storage container.

[0008] In view of this, a liquid level fluctuation measuring device is provided according to a first aspect of the embodiments of this application, comprising: Several sets of mesh structures, each set of mesh structures includes several first conductors and several second conductors. In each set of mesh structures, several second conductors and several first conductors are arranged in a cross pattern to form multiple liquid level monitoring points. There is a gap between the first conductors and the second conductors at each liquid level monitoring point. A signal input unit is connected to the first conductor, and the signal input unit is configured to sequentially input excitation signals to at least a portion of the first conductor. A signal monitoring unit, which is connected to the second conductor, is used to monitor the phase state at different liquid level monitoring point locations.

[0009] In one feasible implementation, the mesh structure is arranged in at least three groups, and the multiple groups of mesh structures are arranged sequentially along one direction, with a gap between adjacent groups of mesh structures.

[0010] In one feasible implementation, in each group of the mesh structures, a plurality of first conductors are arranged parallel to each other and sequentially along a first direction, and a plurality of second conductors are arranged parallel to each other and sequentially along a second direction, wherein the angle between the first direction and the second direction is 30° to 150°.

[0011] In one feasible implementation, the first direction and the second direction are perpendicular to each other.

[0012] In one feasible implementation, the diameter of the first conductor or the diameter of the second conductor are both 0.05mm to 0.5mm, and the axial spacing between two adjacent first conductors or the axial spacing between two adjacent second conductors is not less than 2mm.

[0013] In one feasible implementation, the distance between the first conductor and the second conductor at each liquid level monitoring point is 1 mm to 5 mm.

[0014] In one feasible implementation, the time interval between the signal input unit sequentially inputting the excitation signal to two adjacent first conductors is 2μs~100ms.

[0015] A second aspect of the embodiments of this application provides a liquid level fluctuation measurement method, applied to the aforementioned liquid level fluctuation measurement device, the liquid level fluctuation measurement method comprising: An excitation signal is input to the first conductor through the signal input unit; The response signal of the second conductor is acquired by the signal monitoring unit; The conductivity value at the location of the liquid level monitoring point is obtained based on the response signal; The phase state of the liquid level monitoring point is identified based on the conductivity value; Excitation signals are sequentially input to at least a portion of the first conductor; Based on the phase state of the different liquid level monitoring point locations identified, three-dimensional information of liquid level fluctuations is obtained.

[0016] In one feasible implementation, several groups of the mesh structures are arranged sequentially from top to bottom, and the liquid level fluctuation measurement method includes the following steps: The method of sequentially inputting excitation signals to at least a portion of the first conductor includes the following steps: From top to bottom, starting from the uppermost mesh structure, excitation signals are sequentially input to the first conductors in the adjacent mesh structures; Identify the phase state at the location of the liquid level monitoring point that received the excitation signal; or, Excitation signals are sequentially input from the bottom to the top, starting from the bottommost mesh structure, to the first conductors in the adjacent mesh structures. Identify the phase state of the liquid level monitoring point location upon receiving the excitation signal.

[0017] A liquid storage container is provided according to a third aspect of the embodiments of this application, comprising: Liquid level fluctuation measuring device as described in any of the above technical solutions; The first conductor passes through the liquid storage container and is insulated from the wall of the liquid storage container. The second conductor passes through the liquid storage container and is insulated from the wall of the liquid storage container.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects: The liquid surface fluctuation measurement device provided in this application includes several sets of mesh structures, a signal input unit, and a signal monitoring unit. Each set of mesh structures includes several first conductors and several second conductors arranged in a cross pattern. The intersection of the first conductors and the second conductors is the liquid surface monitoring point. There is a gap between the first conductors and the second conductors at each liquid surface monitoring point. An excitation signal is input to the first conductor through the signal input unit. At the same time, the response signals on all the second conductors that intersect with the first conductor are collected by the signal monitoring unit, thereby monitoring the phase state of the liquid surface monitoring point position on the first conductor. After the excitation signal input of at least some of the first conductors is completed in sequence, the signal monitoring unit can obtain the phase state information at different liquid surface monitoring point positions, thereby reconstructing the three-dimensional information of free liquid surface fluctuation.

[0019] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0020] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic structural diagram of a liquid level fluctuation measuring device according to an embodiment of this application; Figure 2 A schematic flowchart illustrating the steps of a liquid level fluctuation measurement method according to an embodiment of this application; Figure 3 A schematic flowchart illustrating the steps of a first embodiment of the measurement method provided in this application, in which excitation signals are sequentially input to at least a portion of the first conductor; Figure 4 A schematic flowchart illustrating the steps of a second embodiment of the measurement method provided in this application, in which excitation signals are sequentially input to at least a portion of the first conductor.

[0021] in, Figure 1 The correspondence between the reference numerals and component names in the attached drawings is as follows: 10. Mesh structure, 11. First conductor, 12. Second conductor, 13. Liquid level monitoring point. Detailed Implementation

[0022] The following description provides numerous specific details to offer a more thorough understanding of the technical solutions provided by this invention. However, it will be apparent to those skilled in the art that the technical solutions provided by this invention can be implemented without one or more of these details.

[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms “comprising” and / or “including” are used in this specification, they indicate the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or combinations thereof.

[0024] Exemplary embodiments according to the present invention will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of the invention is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art.

[0025] like Figure 1As shown, a liquid level fluctuation measuring device is proposed according to a first aspect of the present application, including several sets of mesh structures 10, a signal input unit, and a signal monitoring unit. Each set of mesh structures 10 includes several first conductors 11 and several second conductors 12. In each set of mesh structures 10, the several second conductors 12 and several first conductors 11 are arranged crosswise to form multiple liquid level monitoring points 13, with a gap between the first conductors 11 and second conductors 12 at each liquid level monitoring point 13. The signal input unit is connected to the first conductors 11 and is configured to sequentially input excitation signals to at least a portion of the first conductors 11. The signal monitoring unit is connected to the second conductors 12 and is used to monitor the phase state at different liquid level monitoring point 13 positions.

[0026] It is understood that the liquid level fluctuation measuring device provided in this embodiment includes several sets of mesh structures 10, a signal input unit and a signal monitoring unit. During use, several sets of mesh structures 10 are placed at the liquid surface to be measured, with at least a portion of the mesh structures 10 located below the liquid surface and at least a portion of the mesh structures 10 located above the liquid surface.

[0027] In this technical solution, each set of mesh structures 10 includes several first conductors 11 and several second conductors 12 arranged in a cross pattern. The intersection of the first conductors 11 and the second conductors 12 is the liquid level monitoring point 13. The first conductors 11 and the second conductors 12 provided in this embodiment can be electrode wires made of metal materials such as 316L stainless steel wire, tungsten wire, molybdenum wire, or copper wire. Depending on the geometry of the liquid storage tank to be tested, several sets of mesh structures 10 are arranged to fill the entire liquid storage tank, or depending on the liquid level, several sets of mesh structures 10 are arranged at the bottom or top of the liquid storage tank.

[0028] In this technical solution, the measurement technology is based on the electrical properties of media in different phases. Therefore, a gap exists between the first conductor 11 and the second conductor 12 at each liquid level monitoring point 13. This gap is used to accommodate the liquid medium below the liquid surface or the air medium above the liquid surface. The electrical properties of media in different phases include conductivity and capacitance values, etc. Monitoring the conductivity value is more direct; therefore, monitoring the conductivity value is the preferred approach. This liquid level fluctuation measurement device is suitable for liquids with conductive properties, and its application and promotion have a broad market and promising prospects.

[0029] In this technical solution, an excitation signal is input to the first conductor 11 via a signal input unit. Simultaneously, a response signal is acquired from a second conductor 12 that intersects with the first conductor 11 via a signal monitoring unit. Based on the conductivity value at the liquid level monitoring point 13 of the response signal, the phase state at the liquid level monitoring point 13 on the first conductor 11 is monitored. Specifically, during liquid surface fluctuations, when a liquid level monitoring point 13 is submerged in liquid, the measured conductivity value is large; when the liquid level monitoring point 13 is exposed to air, the measured conductivity value is small. Comparing the conductivity values ​​allows for phase state identification of a single node. After sequentially inputting excitation signals to at least some of the first conductors 11, the signal monitoring unit can obtain phase state information at different liquid level monitoring point 13 locations, thereby reconstructing the three-dimensional information of free liquid surface fluctuations.

[0030] For example, such as Figure 1 As shown, four sets of mesh structures 10 are arranged at intervals inside the container. For ease of illustration, the mesh structure 10 is arranged with a relatively low density. In each set of mesh structures 10, the length direction of the first conductor 11 is arranged along the depth direction of the container. Each first conductor 11 is intersected with multiple second conductors 12, and the multiple intersection points are the liquid level monitoring points 13. When an excitation signal is input to one of the first conductors 11, the signal monitoring unit simultaneously monitors the response signals on the multiple second conductors 12 that are intersected with the first conductor 11.

[0031] In one feasible implementation, at least three sets of mesh structures 10 are arranged, and multiple sets of mesh structures 10 are arranged sequentially along one direction, with a gap between adjacent sets of mesh structures 10.

[0032] In this scheme, at least three sets of mesh structures 10 are provided. Since the characteristics of liquid surface fluctuations are that they present a periodic pattern of alternating peaks and troughs, at least three sets of mesh structures 10 are required to monitor the state of liquid surface fluctuations based on the characteristics of liquid surface fluctuations.

[0033] In one feasible implementation, in each group of mesh structures 10, a plurality of first conductors 11 are arranged in parallel to each other and in sequence along a first direction, and a plurality of second conductors 12 are arranged in parallel to each other and in sequence along a second direction, wherein the angle between the first direction and the second direction is 30° to 150°.

[0034] In this scheme, the arrangement of the first conductor 11 and the second conductor 12 forms a three-dimensional mesh phase identification matrix, avoiding interference from cross terms and making it easier to establish a three-dimensional model of liquid fluctuation.

[0035] In one feasible implementation, the first direction and the second direction are perpendicular to each other. That is, the first conductor 11 and the second conductor 12 are perpendicular to each other, which reduces the introduction of parameters such as angles, reduces the amount of data processing, and can further improve measurement accuracy.

[0036] In one feasible implementation, the diameter of the first conductor 11 or the diameter of the second conductor 12 is 0.05mm to 0.5mm, and the axial spacing between two adjacent first conductors 11 or between two adjacent second conductors 12 is not less than 2mm. The specific axial spacing of each parallel electrode wire can be determined according to the measurement accuracy.

[0037] In this design, the diameter of the first conductor 11 is 0.05mm to 0.5mm, and the diameter of the second conductor 12 is also 0.05mm to 0.5mm. The axial spacing between two adjacent first conductors 11 is not less than 2mm, and the axial spacing between two adjacent second conductors 12 is not less than 2mm. To ensure the accuracy of liquid surface fluctuation measurement, a certain preload must be maintained when pulling the first conductors 11 and the second conductors 12. The specific preload should be sufficient to ensure that the vibration amplitude of the first conductors 11 and the second conductors 12 is less than 1mm, thus ensuring the structural integrity of the sensing node.

[0038] In one feasible implementation, the distance between the first conductor 11 and the second conductor 12 at each liquid level monitoring point 13 is 1mm to 5mm. Due to the influence of liquid level fluctuations, if the distance between the first conductor 11 and the second conductor 12 is too small, they may come into contact at the intersection, affecting the measurement results. If the distance is too large, the measurement accuracy will be reduced. Therefore, in order to improve the measurement accuracy, the distance between the first conductor 11 and the second conductor 12 provided in this embodiment is 1mm to 5mm.

[0039] In one feasible implementation, the time interval between the signal input unit sequentially inputting excitation signals to two adjacent first conductors 11 is 2μs to 100ms. In this scheme, the liquid surface fluctuation to be monitored is dynamic, and the liquid surface changes over time. After measuring the phase state of a liquid surface monitoring point 13, the phase state at that liquid surface monitoring point 13 and nearby liquid surface monitoring points 13 will change. Therefore, setting the time interval between sequentially inputting excitation signals to 2μs to 100ms can further improve the accuracy of dynamic monitoring.

[0040] like Figure 2 As shown, a liquid level fluctuation measurement method is proposed according to a second aspect of the embodiments of this application, applied to any of the above-described technical solutions' liquid level fluctuation measurement devices. The liquid level fluctuation measurement method includes: Step 21: Input an excitation signal to the first conductor 11 through the signal input unit; Step 22: Acquire the response signal of the second conductor 12 through the signal monitoring unit; Step 23: Obtain the conductivity value at liquid level monitoring point 13 based on the response signal; Step 24: Identify the phase state at liquid level monitoring point 13 based on the conductivity value; Step 25: Sequentially input excitation signals to at least a portion of the first conductor 11; Step 26: Based on the phase states of the different liquid level monitoring points 13 identified, obtain the three-dimensional information of liquid level fluctuations.

[0041] The liquid level fluctuation measurement method provided in this application embodiment, because it is applied to the measuring device of any of the above-described technical solutions, therefore possesses all the beneficial effects of the measuring device of the above-described technical solutions.

[0042] The measurement method provided in this application, combined with a measuring device, allows for the sequential arrangement of several sets of mesh structures 10 along a horizontal direction in one feasible implementation. Figure 1 As shown, adjacent mesh structures 10 are spaced at equal intervals, and each group of mesh structures 10 is arranged vertically. The first conductor 11 is arranged longitudinally, meaning it is arranged along the water depth direction, while the second conductor 12 is arranged laterally. When inputting an excitation signal, input to different mesh structures 10 can be performed simultaneously, but input to different first conductors 11 within the same mesh structure 10 needs to be performed sequentially.

[0043] In one feasible implementation, several sets of mesh structures 10 are arranged sequentially from top to bottom, such as... Figure 3 As shown, in the liquid surface fluctuation measurement method, the method of sequentially inputting excitation signals to at least a portion of the first conductor 11 includes the following steps: Step 2511: From top to bottom, starting from the topmost mesh structure 10, input excitation signals sequentially to the first conductors 11 in the adjacent mesh structures 10; Step 2512: Identify the phase state at the location of the liquid level monitoring point 13 that received the excitation signal; Unlike the above implementation, in this scheme, the arrangement of several sets of mesh structures 10 is sequential from top to bottom. Depending on the arrangement, when inputting the excitation signal, this scheme can choose to start from the topmost mesh structure 10. The signal monitoring unit sequentially identifies the phase state of all liquid level monitoring points 13 in each set of mesh structures 10 from top to bottom until one round of monitoring of liquid level fluctuations is completed. The signal monitoring unit continues to sequentially identify the phase state of all liquid level monitoring points 13 in each set of mesh structures 10 from top to bottom, thus periodically monitoring the liquid level to reconstruct the three-dimensional information of free liquid level fluctuations.

[0044] Based on the above understanding, this method can be chosen when the liquid level in the container is high, as it reduces the amount of data processing while ensuring monitoring accuracy. It also allows for faster measurement of the location of liquid level fluctuations, resulting in more accurate measurement results.

[0045] In one feasible implementation, several sets of mesh structures 10 are arranged sequentially from top to bottom, such as... Figure 4 As shown, in the liquid surface fluctuation measurement method, the method of sequentially inputting excitation signals to at least a portion of the first conductor includes the following steps: Step 2521: From bottom to top, starting from the bottommost mesh structure 10, input excitation signals sequentially to the first conductors 11 in the adjacent mesh structures 10; Step 2522: Identify the phase state at the location of the liquid level monitoring point 13 that received the excitation signal.

[0046] Unlike the above implementation, this solution allows the input of excitation signals to begin from the bottommost mesh structure 10. The signal monitoring unit sequentially identifies the phase state of all liquid level monitoring points 13 in each mesh structure 10 from bottom to top until one round of monitoring of liquid level fluctuations is completed. The signal monitoring unit continues to sequentially identify the phase state of all liquid level monitoring points 13 in each mesh structure 10 from bottom to top, thus periodically monitoring the liquid level and reconstructing the three-dimensional information of free liquid level fluctuations.

[0047] Based on the above understanding, this method can be chosen when the liquid level in the container is low, as it reduces the amount of data processing while ensuring monitoring accuracy. It also allows for faster measurement of the location of liquid level fluctuations, resulting in more accurate measurement results.

[0048] A liquid storage container is provided according to a third aspect of the embodiments of this application, comprising: In any of the above technical solutions of the liquid level fluctuation measuring device, the first conductor 11 passes through the liquid storage container and is insulated from the wall of the liquid storage container. The second conductor 12 passes through the liquid storage container and is insulated from the wall of the liquid storage container.

[0049] like Figure 1As shown, in this scheme, the vertical first conductor 11 is the excitation layer. One end of each electrode wire of the excitation layer is fixed to the bottom of the liquid storage container, and the other end is pulled vertically to the top of the liquid storage container and passes through the top cover, serving as the excitation electrode. The horizontal second conductor 12 is the measurement layer. One end of each electrode wire of the measurement layer is fixed to the wall of the liquid storage container, and the other end is pulled horizontally to the opposite wall and passes through the wall of the liquid storage container, serving as the measurement electrode. It is particularly important to note that if the liquid storage container is made of metal, all electrode wires need to be insulated where they contact the wall of the liquid storage container, and also need to be sealed where they penetrate the wall of the liquid storage container.

[0050] In this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0051] In the description of this invention, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0052] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0053] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A liquid level fluctuation measuring device, characterized in that, include: Several sets of mesh structures, each set of mesh structures includes several first conductors and several second conductors. In each set of mesh structures, several second conductors and several first conductors are arranged in a cross pattern to form multiple liquid level monitoring points. There is a gap between the first conductors and the second conductors at each liquid level monitoring point. A signal input unit is connected to the first conductor, and the signal input unit is configured to sequentially input excitation signals to at least a portion of the first conductor. A signal monitoring unit, which is connected to the second conductor, is used to monitor the phase state at different liquid level monitoring point locations.

2. The liquid level fluctuation measuring device according to claim 1, characterized in that, The mesh structure is arranged in at least three groups, and multiple groups of the mesh structure are arranged sequentially along one direction, with a gap between adjacent groups of the mesh structure.

3. The liquid level fluctuation measuring device according to claim 2, characterized in that, In each group of the mesh structure, several first conductors are arranged parallel to each other and sequentially along a first direction, and several second conductors are arranged parallel to each other and sequentially along a second direction, with the angle between the first direction and the second direction being 30°~150°.

4. The liquid level fluctuation measuring device according to claim 3, characterized in that, The first direction and the second direction are perpendicular to each other.

5. The liquid level fluctuation measuring device according to claim 3, characterized in that, The diameter of the first conductor or the diameter of the second conductor are both 0.05mm to 0.5mm, and the axial spacing between two adjacent first conductors or the axial spacing between two adjacent second conductors is not less than 2mm.

6. The liquid level fluctuation measuring device according to claim 1, characterized in that, The distance between the first conductor and the second conductor at each liquid level monitoring point is 1 mm to 5 mm.

7. The liquid level fluctuation measuring device according to claim 1, characterized in that, The time interval between the signal input unit sequentially inputting the excitation signal to the two adjacent first conductors is 2μs~100ms.

8. A method for measuring liquid level fluctuations, characterized in that, The liquid level fluctuation measuring device as described in any one of claims 1 to 7, wherein the liquid level fluctuation measuring method comprises: An excitation signal is input to the first conductor through the signal input unit; The response signal of the second conductor is acquired by the signal monitoring unit; The conductivity value at the location of the liquid level monitoring point is obtained based on the response signal; The phase state of the liquid level monitoring point is identified based on the conductivity value; Excitation signals are sequentially input to at least a portion of the first conductor; Based on the phase state of the different liquid level monitoring point locations identified, three-dimensional information of liquid level fluctuations is obtained.

9. The liquid level fluctuation measurement method according to claim 8, characterized in that, Several groups of the aforementioned mesh structures are arranged sequentially from top to bottom. In the liquid surface fluctuation measurement method, the method of sequentially inputting excitation signals to at least a portion of the first conductor includes the following steps: From top to bottom, starting from the uppermost mesh structure, excitation signals are sequentially input to the first conductors in the adjacent mesh structures; Identify the phase state at the location of the liquid level monitoring point that received the excitation signal; or, Excitation signals are sequentially input from the bottom to the top, starting from the bottommost mesh structure, to the first conductors in the adjacent mesh structures. Identify the phase state of the liquid level monitoring point location upon receiving the excitation signal.

10. A liquid storage container, characterized in that, include: The liquid level fluctuation measuring device as described in any one of claims 1 to 7; The first conductor passes through the liquid storage container and is insulated from the wall of the liquid storage container. The second conductor passes through the liquid storage container and is insulated from the wall of the liquid storage container.

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