Non-contact liquid height detection system, liquid level detection method, device and liquid container

Abstract

The invention relates to a non-contact liquid height detection system, a liquid level detection method and device and a liquid container. The non-contact liquid height detection system comprises a multi-frequency-band capacitive sensor assembly, a multi-frequency-band signal processing assembly and a data processing assembly. Wherein the multi-frequency-band capacitive sensor assembly is arranged on the outer wall of the liquid container, and the multi-frequency-band capacitive sensor assembly is not in contact with liquid in the liquid container; the multi-frequency-band capacitive sensor assembly is used for collecting capacitance signals of different frequency bands; the multi-band signal processing component is used for performing preset data processing on the capacitance signals of different bands to obtain target digital signals; wherein the preset data processing comprises signal amplification processing, filtering processing and analog-to-digital conversion processing; the data processing assembly is used for obtaining liquid level height information through analysis according to the target digital signal. According to the liquid height detection system not in contact with the liquid level, the service life of the sensor can be effectively prolonged while the high-precision liquid level detection precision is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level detection, and in particular to a non-contact liquid level detection system, a liquid level detection method, a liquid level detection device and a liquid container. BACKGROUND

[0002] Traditional liquid level detection devices usually adopt contact sensors or visual liquid level sensors. However, the contact sensors are easily corroded by liquid, have a short service life, and are difficult to clean and maintain. The visual liquid level sensors are easily disturbed in complex environments (inconsistent transmittance or many impurities in the liquid), and have low detection accuracy. SUMMARY

[0003] Therefore, it is necessary to provide a non-contact liquid level detection system, a liquid level detection method, a liquid level detection device and a liquid container capable of detecting the liquid level with high precision and prolonging the service life of the equipment.

[0004] In a first aspect, the present application provides a non-contact liquid level detection system, comprising: a multi-band capacitive sensor assembly, a multi-band signal processing assembly and a data processing assembly; wherein the multi-band capacitive sensor assembly is arranged on the outer wall of a liquid container, and the multi-band capacitive sensor assembly does not contact the liquid in the liquid container; the multi-band capacitive sensor assembly is connected to the multi-band signal processing assembly; the multi-band signal processing assembly is connected to the data processing assembly.

[0005] The multi-band capacitive sensor assembly is configured to collect capacitive signals of different frequency bands.

[0006] The multi-band signal processing assembly is configured to perform preset data processing on the capacitive signals of different frequency bands to obtain a target digital signal; wherein the preset data processing includes signal amplification processing, filtering processing and analog-to-digital conversion processing.

[0007] The data processing assembly is configured to analyze the target digital signal to obtain liquid level information.

[0008] In one embodiment, the multi-band capacitive sensor assembly comprises a plurality of multi-band capacitive sensors, wherein the multi-band capacitive sensor comprises at least one high-frequency electrode, at least one low-frequency electrode, a PCB board and an insulating material; the base material of the high-frequency electrode and the low-frequency electrode both comprises spring steel material; the high-frequency electrode and the low-frequency electrode are both wound by spring steel material and form a spiral plane at the end; the high-frequency electrode and the low-frequency electrode are welded on the PCB board, and the PCB board is fixed on the outer wall of the liquid container through the insulating material.

[0009] In one embodiment, the high-frequency electrode is coated with graphene material on the spiral plane, and the low-frequency electrode is coated with carbon nanotube material on the spiral plane.

[0010] In one embodiment, the multi-band capacitive sensors are arranged vertically at preset intervals on the outer wall of the liquid container.

[0011] In one embodiment, the initial pre-pressure of the high-frequency electrode is greater than the initial pre-pressure of the low-frequency electrode; the helical diameter of the high-frequency electrode is smaller than the helical diameter of the low-frequency electrode; wherein the initial pre-pressure is the spring pressure when the electrode is not pressed.

[0012] In one embodiment, it further includes: a display component and an alarm component; the data processing component is connected to the display component and the alarm component respectively;

[0013] The data processing component is used to send a display control signal to the display component according to the liquid level information, so that the display component displays the liquid level information according to the display control signal.

[0014] The data processing component is used to send an alarm control signal to the alarm component when the liquid level information is greater than or equal to a preset height threshold, so that the alarm component performs preset alarm processing according to the alarm control signal.

[0015] In one embodiment, the multi-band signal processing component includes a low-frequency amplification unit, a high-frequency amplification unit, a multi-band filtering unit, and an analog-to-digital conversion unit;

[0016] One end of the low-frequency amplification unit is connected to the low-frequency electrode, and the other end is connected to the multi-band filter unit; one end of the high-frequency amplification unit is connected to the high-frequency electrode, and the other end is connected to the multi-band filter unit; the multi-band filter unit is connected to the analog-to-digital conversion unit.

[0017] The low-frequency amplification unit is used to amplify the low-frequency capacitor signal.

[0018] The high-frequency amplification unit is used to amplify the high-frequency capacitor signal.

[0019] The multi-band filtering unit is used to filter the amplified low-frequency capacitor signal and high-frequency capacitor signal.

[0020] The analog-to-digital conversion unit is used to perform analog-to-digital conversion processing on the filtered low-frequency capacitor signal and high-frequency capacitor signal to obtain the target digital signal; the target digital signal includes low-frequency digital signal and high-frequency digital signal.

[0021] In one of the embodiments, the multi-band capacitive sensor assembly comprises a three-dimensional capacitive sensor array, and the three-dimensional capacitive sensor array comprises a plurality of three-dimensional capacitive sensors.

[0022] The three-dimensional capacitive sensor array is arranged on an outer wall of the liquid container.

[0023] In one of the embodiments, the system further comprises a temperature compensation sensor arranged on an inner wall of the liquid container for monitoring an ambient temperature.

[0024] The temperature compensation sensor is connected to the data processing assembly.

[0025] The data processing assembly is configured to calculate a signal compensation value according to the ambient temperature and a preset compensation algorithm, and analyze the liquid level information according to the signal compensation value and the target digital signal.

[0026] In a second aspect, the application further provides a liquid container, wherein the liquid container is internally installed with the non-contact liquid level detection system of the first aspect.

[0027] In a third aspect, the application further provides a liquid level detection method, which is applied to the non-contact liquid level detection system of the first aspect, and the method comprises the following steps:

[0028] acquiring a target digital signal, wherein the target digital signal is a digital signal obtained by performing preset data processing on capacitive signals of different frequency bands collected by the multi-band capacitive sensor assembly;

[0029] analyzing the liquid level information according to the target digital signal.

[0030] In a fourth aspect, the application further provides a liquid level detection device, which is applied to the non-contact liquid level detection system of the first aspect, and the device comprises the following components:

[0031] an acquisition module configured to acquire a target digital signal, wherein the target digital signal is a digital signal obtained by performing preset data processing on capacitive signals of different frequency bands collected by the multi-band capacitive sensor assembly;

[0032] an analysis module configured to analyze the liquid level information according to the target digital signal.

[0033] In summary, the application provides a non-contact liquid level detection system, a liquid level detection method, a liquid level detection device and a liquid container. The non-contact liquid level detection system comprises a multi-band capacitive sensor assembly, a multi-band signal processing assembly and a data processing assembly. The multi-band capacitive sensor assembly is arranged on the outer wall of the liquid container and does not contact the liquid in the liquid container. The multi-band capacitive sensor assembly is used to collect capacitive signals of different frequency bands. The multi-band signal processing assembly is used to perform preset data processing on the capacitive signals of different frequency bands to obtain a target digital signal. The preset data processing includes signal amplification processing, filtering processing and analog-to-digital conversion processing. The data processing assembly is used to analyze the target digital signal to obtain liquid level information. The application provides a liquid level detection system that does not contact the liquid surface, which can effectively prolong the service life of the sensor while ensuring high-precision detection of the liquid surface. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 FIG. 1 is a structural block diagram of a non-contact liquid level detection system according to an embodiment of the application;

[0035] Figure 2 FIG. 2 is a schematic diagram of an application scenario of the non-contact liquid level detection system according to an embodiment of the application;

[0036] Figure 3 FIG. 3 is a structural schematic diagram of a high-frequency electrode and a low-frequency electrode according to an embodiment of the application;

[0037] Figure 4 FIG. 4 is a structural schematic diagram of a high-frequency electrode and a low-frequency electrode according to another embodiment of the application;

[0038] Figure 5 FIG. 5 is a flowchart of a liquid level detection method according to an embodiment of the application;

[0039] Figure 6 FIG. 6 is a structural block diagram of a liquid level detection device according to an embodiment of the application;

[0040] Figure 7 FIG. 7 is a structural block diagram of a computer device according to an embodiment of the application.

[0041] SUMMARY OF DRAWINGS:

[0042] Multi-band capacitive sensor assembly - 110; high-frequency electrode - 111; low-frequency electrode - 112; PCB board - 113; multi-band signal processing assembly 120; high-frequency amplification unit - 121; low-frequency amplification unit - 122; multi-band filtering unit - 123; analog-to-digital conversion unit - 124; data processing assembly - 130; alarm assembly - 140; display assembly - 150. DETAILED DESCRIPTION

[0043] For the purpose of clarity, the present application will be described in greater detail below with reference to the accompanying drawings. The embodiments of the present application are shown in the drawings. However, the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] It should be understood that the terms "first", "second" and so on used herein can be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish the first element from another element. For example, without departing from the scope of the application, a first resistor can be called a second resistor, and similarly, a second resistor can be called a first resistor. The first resistor and the second resistor are both resistors, but they are not the same resistor.

[0046] It should be understood that "connection" in the following embodiments means that the circuits, modules, units, etc. connected to each other have electrical signal or data transmission.

[0047] It should be understood that "at least one" means one or more, and "multiple" means two or more. "At least part of the element" means part or all of the element.

[0048] As used herein, the singular forms "a", "an" and "the" can include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "comprise / comprising" or "have / having" specifies the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but does not exclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. At the same time, the term "and / or" used in the specification includes any and all combinations of the related listed items.

[0049] In one embodiment, as shown in Figure 1 A non-contact liquid level detection system is provided, including a multi-band capacitive sensor assembly 110, a multi-band signal processing assembly 120 and a data processing assembly 130. The multi-band capacitive sensor assembly 110 is connected to the multi-band signal processing assembly 120. The multi-band signal processing assembly 120 is connected to the data processing assembly 130.

[0050] In this embodiment, as shown inFigure 2 As shown, the multi-band capacitive sensor assembly 110 is arranged on the outer wall of the liquid container 200, and the multi-band capacitive sensor assembly 110 is not in contact with the liquid in the liquid container 200. Here, the outer wall of the liquid container 200 refers to the outer wall surface, i.e., the surface of the liquid container 200. Since the multi-band capacitive sensor assembly 110 is arranged on the surface of the liquid container 200, the device structure of the multi-band capacitive sensor assembly 110 will not be in contact with the liquid in the liquid container 200. In specific embodiments, the actual arrangement position of the multi-band capacitive sensor assembly 110 can be a position at a preset distance from the bottom of the liquid container 200, i.e., the liquid level height that needs to be detected by the multi-band capacitive sensor assembly 110.

[0051] In this embodiment, the multi-band capacitive sensor assembly 110 is used to collect capacitive signals of different frequency bands. The capacitive signals of different frequency bands at least include high-frequency capacitive signals and low-frequency capacitive signals. In actual application, the high-frequency capacitive signals and the low-frequency capacitive signals can effectively improve the precision of liquid level detection. Specifically, the response speed of the high-frequency capacitive signals is faster, and the high-frequency capacitive signals can be used to capture rapid changes in the liquid level height, for example, in the scenario of rapid liquid injection, the changed liquid level height can be obtained faster through the high-frequency capacitive signals. The stability of the low-frequency capacitive signals is stronger, and the low-frequency capacitive signals can be used to correct the fluctuation error of the high-frequency capacitive signals.

[0052] In this embodiment, the multi-band signal processing assembly 120 is used to perform preset data processing on the capacitive signals of different frequency bands to obtain target digital signals. The preset data processing includes signal amplification processing, filtering processing, and analog-to-digital conversion processing. In actual application, due to environmental factors, the high-frequency capacitive signals and the low-frequency capacitive signals may appear various interferences in actual application scenarios, such as attenuation of the low-frequency capacitive signals and fluctuation interference of the high-frequency capacitive signals. In this embodiment, various data pre-processing is performed on the capacitive signals of different frequency bands to obtain target digital signals. The target digital signals include high-frequency digital signals and low-frequency digital signals.

[0053] In a feasible embodiment, the multi-band signal processing assembly 120 can also be used to screen out valid capacitive signals. For example, in the case where the change rate of the high-frequency capacitive signals is greater than or equal to a preset threshold, it is determined that the fluctuation amplitude of the high-frequency capacitive signals is too large, i.e., the high-frequency capacitive signals are determined to be false touch signals. In the case where the change rate of the high-frequency capacitive signals is less than the preset threshold, it is determined that the fluctuation amplitude of the high-frequency capacitive signals is normal, and the high-frequency capacitive signals are determined to be valid capacitive signals. It should be noted that the specific judgment conditions for screening valid capacitive signals by the multi-band signal processing assembly 120 can be configured according to the needs of actual application scenarios to adapt to the needs of actual application scenarios.

[0054] In the embodiment, the data processing component 130 is configured to analyze the target digital signal to obtain the liquid level information. The data processing component 130 in the embodiment can combine a machine learning algorithm (preferably a support vector machine algorithm) to establish a mapping model of the capacitance signal change-liquid level, so as to utilize the difference in dielectric constant between the liquid and the air (the dielectric constant of water is about 50-80, and the dielectric constant of air is about 1), and inversely deduce the liquid level from the capacitance signal change according to the capacitance formula C = εA / d, where ε is the dielectric constant, A is the electrode area, and d is the equivalent distance between the electrode and the liquid.

[0055] In the embodiment, a liquid level analysis model can be pre-configured in the data processing component 130, which can be trained by machine learning. For example, the liquid level change data can be collected by the multi-band capacitance sensor to construct a training data set. Specifically, after the multi-band signal processing component 120 is arranged outside the liquid container 200, a certain height of liquid is injected into the liquid container 200, and the high-frequency and low-frequency capacitance values corresponding to each liquid level are recorded by measuring the liquid level step by step from 0% to 100%. The high-frequency and low-frequency capacitance values are normalized respectively to avoid the influence of dimension difference on model training. The difference, ratio, derivative, etc. of the high-frequency and low-frequency capacitance values are extracted to enhance the sensitivity of the model to the liquid level change. The preprocessed data is divided into a training set (70%) and a test set (30%). The model is trained using the training set, and the parameters are optimized by back propagation. The model performance is verified on the test set, and the mean square error and the determination coefficient are calculated.

[0056] In the actual use of the liquid container 200, the high-frequency and low-frequency capacitance values are continuously collected (10 times per second), and the data is input into the trained liquid level analysis model to output the liquid level height.

[0057] In one embodiment, after obtaining the liquid level analysis model, the accuracy of the predicted value can also be verified by actual measurement. Abnormal data is detected by residual analysis (the difference between the predicted value and the actual value), and if the residual exceeds the threshold value, for example, ±3%, manual calibration is triggered.

[0058] In summary, the embodiment provides a non-contact liquid level detection system. The multi-band capacitance sensor component 110 does not need to be in direct contact with the liquid, which not only avoids contamination of the liquid by the sensor, but also solves the problem that the contact sensor is easily corroded by the liquid. Moreover, the detection accuracy can be guaranteed in complex environments with inconsistent transmittance or many impurities in the liquid. Compared with the prior art, the non-contact liquid level detection system provided by the embodiment is effectively improved in safety, anti-interference ability, and intelligent level.

[0059] In one of the embodiments, as shown in FIG. 1, the multi-band signal processing component 120 is arranged outside the liquid container 200, and the multi-band capacitance sensor component 110 is arranged inside the liquid container 200. Figure 3 and Figure 4As shown, the multi-band capacitive sensor assembly 110 includes a plurality of multi-band capacitive sensors, wherein the multi-band capacitive sensor includes at least one high-frequency electrode 111, at least one low-frequency electrode 112, a PCB board 113, and an insulating material.

[0060] In the embodiment, the base material of the high-frequency electrode 111 and the low-frequency electrode 112 both include spring steel material. The high-frequency electrode 111 and the low-frequency electrode 112 are both wound by spring steel material and formed into a spiral plane at the end. Specifically, the actual structure of the high-frequency electrode 111 and the low-frequency electrode 112 is as shown in Figure 3 As shown, the spiral diameter of the high-frequency electrode 111 is smaller than the spiral diameter of the low-frequency electrode 112, so as to adapt to the short-wavelength characteristics of the high-frequency signal and reduce signal interference. In actual application, the initial pre-pressure of the high-frequency electrode 111 is greater than the initial pre-pressure of the low-frequency electrode 112, so as to reduce the signal triggering threshold by pre-pressure and further improve the signal acquisition sensitivity of the high-frequency electrode 111, thereby more sensitive monitoring of the change of the liquid surface. Wherein, the initial pre-pressure is the spring pressure when the electrode is not pressed.

[0061] As shown in Figure 4 As shown, the high-frequency electrode 111 and the low-frequency electrode 112 are welded on the PCB board 113, and the PCB board 113 is fixed on the outer wall of the liquid container 200 by the insulating material. In the embodiment, the high-frequency electrode 111 and the low-frequency electrode 112 are welded on the PCB board 113, wherein the PCB board 113 adopts silicon base material and has good insulation. The PCB board 113 is fixed on the outer wall of the container by the insulating material, so as to ensure that the sensor is closely attached to the container wall and has no electrical conduction. Wherein, the insulating material is, for example, polytetrafluoroethylene which has strong temperature resistance and excellent insulation.

[0062] In one embodiment, the coating layer of the spiral plane of the high-frequency electrode 111 adopts graphene material, and the coating layer of the spiral plane of the low-frequency electrode 112 adopts carbon nanotube material.

[0063] In the embodiment, the base material of the high-frequency electrode 111 and the low-frequency electrode 112 both adopt spring steel material, which has both elasticity and conductivity, and can be wound to form a spiral plane at the end, so as to improve the signal acquisition stability.

[0064] In the embodiment, the coating layer of the spiral plane of the high-frequency electrode 111 adopts graphene material, which has high conductivity and can enhance the acquisition sensitivity of the high-frequency signal. The coating layer of the spiral plane of the low-frequency electrode 112 adopts carbon nanotube material, which has low signal attenuation rate and is suitable for stable acquisition of low-frequency signal.

[0065] In one of the embodiments, the display component 150 and the alarm component 140 are further included. The data processing component 130 is connected to the display component 150 and the alarm component 140 respectively. In the embodiment, the display component 150 and the alarm component 140 can be connected to the data processing component 130 by using wireless communication technology. The data processing component 130 transmits the liquid level information to the display component 150 and the alarm component 140 by Bluetooth or WiFi, so as to display the page height or perform alarm processing.

[0066] The data processing component 130 is configured to send a display control signal to the display component 150 according to the liquid level information, so that the display component 150 displays the liquid level information according to the display control signal. The data processing component 130 is configured to send an alarm control signal to the alarm component 140 when the liquid level information is greater than or equal to a preset height threshold, so that the alarm component 140 performs preset alarm processing according to the alarm control signal.

[0067] In the embodiment, the display component 150 and the alarm component 140 can be directly arranged on the liquid container 200, or can be arranged on other mobile device terminals or cloud platforms. The display component 150 can be a display screen or an LED indicator light. The alarm component 140 can perform alarm processing such as sound, light, mobile phone notification, etc. It should be noted that the actual structure of the display component 150 and the alarm component 140, as well as the specific display control mode and the specific alarm control mode, can be adaptively configured according to the needs of the actual application scene.

[0068] In one of the embodiments, the multi-band signal processing component 120 includes a low-frequency amplification unit 122, a high-frequency amplification unit 121, a multi-band filtering unit 123, and an analog-to-digital conversion unit 124. One end of the low-frequency amplification unit 122 is connected to the low-frequency electrode 112, and the other end is connected to the multi-band filtering unit 123. One end of the high-frequency amplification unit 121 is connected to the high-frequency electrode 111, and the other end is connected to the multi-band filtering unit 123. The multi-band filtering unit 123 is connected to the analog-to-digital conversion unit 124.

[0069] The low-frequency amplification unit 122 is configured to perform signal amplification processing on the low-frequency capacitance signal. The high-frequency amplification unit 121 is configured to perform signal amplification processing on the high-frequency capacitance signal. The multi-band filtering unit 123 is configured to perform filtering processing on the amplified low-frequency capacitance signal and high-frequency capacitance signal. The analog-to-digital conversion unit 124 is configured to perform analog-to-digital conversion processing on the filtered low-frequency capacitance signal and high-frequency capacitance signal to obtain a target digital signal; the target digital signal includes a low-frequency digital signal and a high-frequency digital signal.

[0070] In the embodiment, the multi-band signal processing assembly 120 is mainly used for converting the analog signals collected by the sensor into analyzable digital signals. The low-frequency amplification unit 122 can adopt a low-frequency signal amplifier, the input end of which is connected with the low-frequency electrode 112, and the output end of which is connected with the multi-band filtering unit 123. The low-frequency amplification unit 122 is used for amplifying the low-frequency capacitive signals, and the amplification multiple can be dynamically adjusted according to the signal strength to avoid detection errors caused by the attenuation of the low-frequency signals.

[0071] The high-frequency amplification unit 121 can adopt a high-frequency signal amplifier, the input end of which is connected with the high-frequency electrode 111, and the output end of which is connected with the multi-band filtering unit 123. The high-frequency signal amplifier is used for specifically amplifying the high-frequency capacitive signals. The high-frequency signals are susceptible to interference, and the amplification multiple needs to be matched with the low-frequency signals to ensure the consistency of subsequent data processing.

[0072] The multi-band filtering unit 123 can adopt a tunable filter, which can filter the amplified high-frequency and low-frequency signals respectively to filter out electromagnetic interference (such as motor interference and radio frequency interference in industrial environments), environmental noise (such as signal fluctuation caused by vibration), and retain effective capacitive signals. In actual application, the multi-band filtering unit 123 can also use a band-pass filter (100 kHz-1 MHz) to filter high-frequency noise and retain high-frequency capacitive change signals. A low-pass filter (cutoff frequency 500 Hz) is used to suppress transient jitter (such as false touch signals) in high-frequency signals. A low-pass filter (cutoff frequency 10 Hz) is used to smooth the low-frequency capacitive value and suppress slow-changing interference such as temperature and humidity.

[0073] In the embodiment, the analog-to-digital conversion unit 124 is connected with the multi-band filtering unit 123 to synchronously convert the filtered high-frequency and low-frequency analog signals into digital signals (sampling rate ≥ 1 kHz to ensure signal real-time performance), and output target digital signals containing high-frequency digital signals and low-frequency digital signals.

[0074] In one of the embodiments, the multi-band capacitive sensor assembly 110 includes a three-dimensional capacitive sensor array, and the three-dimensional capacitive sensor array includes a plurality of three-dimensional capacitive sensors.

[0075] The three-dimensional capacitive sensor array is arranged on the outer wall of the liquid container 200.

[0076] In the embodiment, the multi-band capacitive sensor assembly 110 can also use a three-dimensional capacitive sensor array composed of a plurality of three-dimensional capacitive sensors, which is suitable for tilted containers or irregularly shaped containers (such as conical tanks and special-shaped reaction kettles). The three-dimensional capacitive sensor array can collect capacitive signals in multiple directions to simultaneously monitor the liquid level and horizontal position offset, thereby avoiding detection errors caused by the tilting of the container.

[0077] Based on the above steps, the three-dimensional capacitive sensor array can be used to monitor the horizontal deviation of the liquid level in real time, such as the liquid level being higher on the left and lower on the right when the water tank is tilted. The data processing component 130 calculates the actual liquid level height by fusing multi-directional signals, which is suitable for industrial irregular container scenarios.

[0078] In one of the embodiments, the non-contact liquid level detection system further comprises a temperature compensation sensor. The temperature compensation sensor is arranged on the inner wall of the liquid container 200 to monitor the ambient temperature.

[0079] The temperature compensation sensor is connected to the data processing component 130.

[0080] The data processing component 130 is configured to calculate a signal compensation value according to the ambient temperature and a preset compensation algorithm, and to analyze the liquid level information according to the signal compensation value and the target digital signal.

[0081] In this embodiment, the temperature compensation sensor can be a PT100 platinum resistance sensor, which is pasted on the middle of the inner wall of the liquid container 200, such as a reaction kettle. The data processing component 130 optimizes the compensation algorithm and dynamically adjusts the capacitive signal compensation coefficient based on the temperature-dielectric constant curve, which indicates the relationship between temperature and dielectric constant, for example, the dielectric constant of sulfuric acid solution is 85 at 100°C and 82 at 150°C.

[0082] Based on the above steps, the detection error after compensation can be effectively controlled at a high temperature of 150°C, and the non-contact installation of the capacitive detection sensor avoids corrosion by sulfuric acid, which can effectively meet the laboratory precision detection requirements.

[0083] In summary, the present embodiment provides a non-contact liquid level detection system. The sensor component is installed on the outer wall of the container and does not come into contact with the liquid, completely avoiding liquid corrosion and impurity attachment problems, effectively prolonging the service life of the sensor, and not polluting the liquid, which is suitable for high-precision scenarios such as food and medicine. Through the cooperative collection of high-frequency and low-frequency signals and the combination of multi-frequency filtering, electromagnetic interference and liquid turbidity / color interference can be effectively resisted, and the detection accuracy is effectively improved in industrial electromagnetic environments or laboratory impurity-containing solutions. The temperature compensation function eliminates the influence of temperature changes on the capacitive signal, the three-dimensional sensor array adapts to irregular containers, and the dynamic calibration function adapts to equipment drift after long-term use, which can cover multiple scenarios such as home, industry, and laboratory.

[0084] In one embodiment, as shown in Figure 5 , a liquid level detection method is provided. The method is applied to the data processing component of the non-contact liquid level detection system in Figure 1 , which is described as follows:

[0085] S501, obtaining a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on different frequency band capacitive signals collected by a multi-frequency band capacitive sensor assembly;

[0086] S502, obtaining liquid level information according to the target digital signal.

[0087] In one of the embodiments, the liquid level detection method further comprises:

[0088] sending a display control signal to a display assembly according to the liquid level information, so that the display assembly displays the liquid level information according to the display control signal.

[0089] In one of the embodiments, the liquid level detection method further comprises:

[0090] In the case where the liquid level information is greater than or equal to a preset height threshold, an alarm control signal is sent to an alarm assembly, so that the alarm assembly performs preset alarm processing according to the alarm control signal.

[0091] In one of the embodiments, the target digital signal is obtained by:

[0092] obtaining a low-frequency capacitive signal and a high-frequency capacitive signal;

[0093] respectively performing signal amplification processing on the low-frequency capacitive signal and the high-frequency capacitive signal;

[0094] performing filtering processing on the amplified low-frequency capacitive signal and high-frequency capacitive signal;

[0095] performing analog-to-digital conversion processing on the filtered low-frequency capacitive signal and high-frequency capacitive signal to obtain the target digital signal; the target digital signal includes a low-frequency digital signal and a high-frequency digital signal.

[0096] In one of the embodiments, the liquid level detection method further comprises:

[0097] obtaining an ambient temperature;

[0098] calculating a signal compensation value according to the ambient temperature and a preset compensation algorithm;

[0099] obtaining the liquid level information according to the signal compensation value and the target digital signal.

[0100] In summary, the embodiment provides a liquid level detection method. The sensor assembly is installed on the outer wall of the container and does not contact the liquid, thereby completely avoiding liquid corrosion and impurity adhesion problems, effectively prolonging the service life of the sensor, and not polluting the liquid, suitable for high-precision scenarios such as food and medicine; through the cooperative collection of high-frequency and low-frequency signals and the combination of multi-frequency filtering, electromagnetic interference and liquid turbidity / color interference can be effectively resisted, and the detection accuracy is effectively improved in an industrial electromagnetic environment or a laboratory impurity-containing solution. The influence of temperature change on the capacitance signal is eliminated through the temperature compensation function, the three-dimensional sensor array is adapted to irregular containers, the dynamic calibration function is adapted to equipment drift after long-term use, and multiple scenes such as home, industry, and laboratory can be covered.

[0101] It should be understood that, although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the order of the arrow. Unless otherwise specified herein, there is no strict order limitation for the execution of these steps, and these steps can be executed in other orders. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0102] Based on the same inventive concept, the embodiment of the present application also provides a liquid level detection device for implementing the above-mentioned liquid level detection method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one or more liquid level detection device embodiments provided below can refer to the limitations of the liquid level detection method described above, and will not be repeated here.

[0103] In one embodiment, as shown in Figure 6 A liquid level detection device 600 is provided, comprising: an acquisition module 610 and an analysis module 620, wherein:

[0104] The acquisition module 610 is configured to acquire a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on different frequency band capacitance signals collected by a multi-frequency band capacitance sensor assembly;

[0105] The analysis module 620 is configured to analyze the target digital signal to obtain liquid level information.

[0106] In one embodiment, the liquid level detection device 600 further comprises:

[0107] The control module is configured to send a display control signal to the display assembly according to the liquid level information, so that the display assembly displays the liquid level information according to the display control signal.

[0108] In one of the embodiments, the control module is further configured to send an alarm control signal to the alarm assembly when the liquid level information is greater than or equal to a preset height threshold, so that the alarm assembly performs preset alarm processing according to the alarm control signal.

[0109] In one of the embodiments, the acquisition module is specifically configured to acquire the low-frequency capacitance signal and the high-frequency capacitance signal, perform signal amplification processing on the low-frequency capacitance signal and the high-frequency capacitance signal respectively, perform filtering processing on the amplified low-frequency capacitance signal and the high-frequency capacitance signal, and perform analog-to-digital conversion processing on the filtered low-frequency capacitance signal and the high-frequency capacitance signal to obtain a target digital signal. The target digital signal includes a low-frequency digital signal and a high-frequency digital signal.

[0110] In one of the embodiments, the analysis module is specifically configured to acquire an ambient temperature, calculate a signal compensation value according to the ambient temperature and a preset compensation algorithm, and analyze the liquid level information according to the signal compensation value and the target digital signal.

[0111] To sum up, the embodiment further provides a liquid level detection device. The sensor assembly is installed on the outer wall of the container and does not contact the liquid, so that the problem of liquid corrosion and impurity adhesion is completely avoided, the service life of the sensor is effectively prolonged, and the liquid is not polluted. The device is suitable for high-precision scenes such as food and medicine. Through the cooperative acquisition of high-frequency and low-frequency signals and the combination of multi-frequency filtering, the device can effectively resist electromagnetic interference and liquid turbidity / color interference, and the detection accuracy is effectively improved in an industrial electromagnetic environment or a laboratory impurity-containing solution. The temperature compensation function is used to eliminate the influence of temperature change on the capacitance signal. The three-dimensional sensor array is adapted to irregular containers, and the dynamic calibration function is adapted to equipment drift after long-term use, so that the device can be applied to multiple scenes such as home, industry, and laboratory.

[0112] The above-mentioned modules in the liquid level detection device can be all or partially realized by software, hardware, and a combination thereof. The above-mentioned modules can be embedded in or independent of a processor in a computer device in a hardware form, or can be stored in a memory in the computer device in a software form, so as to be called and executed by a processor to perform the operations corresponding to the above-mentioned modules.

[0113] In one embodiment, a computer device is provided, which can be a terminal, and an internal structure diagram of the computer device can be as shown in Figure 7As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs stored in the non-volatile storage media. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, NFC (Near Field Communication), or other technologies. When executed by the processor, the computer program implements a liquid level detection method. The display unit is used to form a visually visible image and can be a display screen, projection device, or virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0114] Those skilled in the art will understand that Figure 7 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0115] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0116] Acquire the target digital signal; wherein, the target digital signal is the digital signal obtained after performing preset data processing on the capacitance signals of different frequency bands collected by the multi-band capacitive sensor component;

[0117] The liquid level height information is obtained by analyzing the target digital signal.

[0118] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0119] obtaining a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on the different frequency band capacitive signals collected by the multi-frequency band capacitive sensor assembly;

[0120] obtaining liquid level information according to the target digital signal.

[0121] In one embodiment, a computer program product is provided, comprising a computer program which, when executed by a processor, implements the following steps:

[0122] obtaining a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on the different frequency band capacitive signals collected by the multi-frequency band capacitive sensor assembly;

[0123] obtaining liquid level information according to the target digital signal.

[0124] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (MRAM), ferroelectric memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0125] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist, it should be considered as the scope of the present application.

[0126] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A non-contact liquid level detection system, characterized by, The application relates to a multi-frequency-band capacitive sensor assembly, a multi-frequency-band signal processing assembly and a data processing assembly. The multi-frequency-band capacitive sensor assembly is arranged on the outer wall of a liquid container and does not contact the liquid in the liquid container; the multi-frequency-band capacitive sensor assembly is connected to the multi-frequency-band signal processing assembly; the multi-frequency-band signal processing assembly is connected to the data processing assembly. The multi-frequency-band capacitive sensor assembly is used for collecting capacitive signals of different frequency bands. The multi-frequency-band signal processing assembly is used for performing preset data processing on the capacitive signals of different frequency bands to obtain target digital signals; the preset data processing includes signal amplification processing, filtering processing and analog-digital conversion processing. The data processing assembly is used for analyzing the target digital signals to obtain liquid level information.

2. The system of claim 1, wherein, The multi-frequency-band capacitive sensor assembly comprises a plurality of multi-frequency-band capacitive sensors, wherein the multi-frequency-band capacitive sensor comprises at least one high-frequency electrode, at least one low-frequency electrode, a PCB plate and insulating material; the base materials of the high-frequency electrode and the low-frequency electrode both comprise spring steel material; the high-frequency electrode and the low-frequency electrode are both wound by spring steel material and form spiral planes at the end portions; the high-frequency electrode and the low-frequency electrode are welded on the PCB plate, and the PCB plate is fixed on the outer wall of the liquid container through the insulating material.

3. The system of claim 2, wherein, The coating of the high-frequency electrode on the spiral plane adopts graphene material, and the coating of the low-frequency electrode on the spiral plane adopts carbon nanotube material.

4. The system of claim 2, wherein, The multi-frequency-band capacitive sensors are vertically arranged on the outer wall of the liquid container at preset intervals.

5. The system of claim 2, wherein, The initial pre-pressure of the high-frequency electrode is greater than that of the low-frequency electrode; the spiral diameter of the high-frequency electrode is smaller than that of the low-frequency electrode; wherein the initial pre-pressure is the spring pressure when the electrode is not pressed.

6. The system of claim 1, wherein, The application further relates to a display assembly and an alarm assembly; the data processing assembly is connected to the display assembly and the alarm assembly respectively; The data processing assembly is used for sending a display control signal to the display assembly according to the liquid level information, so that the display assembly displays the liquid level information according to the display control signal; The data processing assembly is used for sending an alarm control signal to the alarm assembly when the liquid level information is greater than or equal to a preset height threshold, so that the alarm assembly performs preset alarm processing according to the alarm control signal. The multi-frequency-band signal processing assembly comprises a low-frequency amplification unit, a high-frequency amplification unit, a multi-frequency-band filtering unit and an analog-digital conversion unit; 7. The system of claim 2, wherein, One end of the low-frequency amplification unit is connected to the low-frequency electrode, and the other end is connected to the multi-frequency-band filtering unit; one end of the high-frequency amplification unit is connected to the high-frequency electrode, and the other end is connected to the multi-frequency-band filtering unit; the multi-frequency-band filtering unit is connected to the analog-digital conversion unit; The low-frequency amplification unit is used for performing signal amplification processing on a low-frequency capacitive signal; The high-frequency amplification unit is used for performing signal amplification processing on a high-frequency capacitive signal; ​ The multi-band filter unit is configured to filter the amplified low-frequency capacitive signals and high-frequency capacitive signals. The analog-to-digital conversion unit is configured to perform analog-to-digital conversion on the filtered low-frequency capacitive signals and high-frequency capacitive signals to obtain the target digital signals; the target digital signals include low-frequency digital signals and high-frequency digital signals.

8. The system of claim 1, wherein, The multi-band capacitive sensor assembly includes a three-dimensional capacitive sensor array, and the three-dimensional capacitive sensor array includes a plurality of three-dimensional capacitive sensors. The three-dimensional capacitive sensor array is arranged on an outer wall of the liquid container.

9. The system of claim 1, wherein, Further comprising: a temperature compensation sensor arranged on an inner wall of the liquid container and configured to monitor an ambient temperature; The temperature compensation sensor is connected to the data processing assembly. The data processing assembly is configured to calculate a signal compensation value according to the ambient temperature and a preset compensation algorithm, and analyze liquid level information according to the signal compensation value and the target digital signals.

10. A liquid container characterized by comprising: The liquid container is provided with the non-contact liquid level detection system according to any one of claims 1 to 9.

11. A liquid level detection method characterized by, The method is applied to the non-contact liquid level detection system according to any one of claims 1 to 9, and the method comprises: obtaining a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on capacitive signals of different frequency bands collected by a multi-band capacitive sensor assembly; analyzing liquid level information according to the target digital signal.

12. A liquid level detecting device characterized by comprising: The device is applied to the non-contact liquid level detection system according to any one of claims 1 to 9, and the device comprises: an obtaining module configured to obtain a target digital signal; wherein the target digital signal is a digital signal obtained by performing preset data processing on capacitive signals of different frequency bands collected by a multi-band capacitive sensor assembly; an analyzing module configured to analyze liquid level information according to the target digital signal.

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