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

Abstract

The application relates to a non-contact liquid level detection system, a liquid level detection method, a liquid level detection device and a liquid container, which comprise 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 the liquid container and does not contact the liquid in the liquid container; 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 comprises signal amplification processing, filtering processing and analog-digital conversion processing; and the data processing assembly is used for analyzing the target digital signals to obtain liquid level information. The application provides a liquid level detection system which does not contact the liquid level and can effectively prolong the service life of the sensor while ensuring high-precision detection of the liquid level.

Description

Technical Field

[0001] This application relates to the field of liquid level detection technology, and in particular to a non-contact liquid level detection system, liquid level detection method, device and liquid container. Background Technology

[0002] Traditional liquid level detection devices typically employ contact sensors or visual liquid level sensors. However, contact sensors are susceptible to liquid corrosion, have a short lifespan, and are difficult to clean and maintain. Visual liquid level sensors are easily interfered with in complex environments (inconsistent light transmittance or high levels of impurities in the liquid), resulting in lower detection accuracy. Summary of the Invention

[0003] Therefore, it is necessary to provide a non-contact liquid level detection system, liquid level detection method, device, and liquid container that can accurately detect liquid level and improve equipment lifespan, in order to address the above-mentioned technical problems.

[0004] In a first aspect, this application provides a non-contact liquid height 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 disposed on the outer wall of a liquid container and does not contact the liquid inside the liquid container; the multi-band capacitive sensor assembly is connected to the multi-band signal processing assembly; and the multi-band signal processing assembly is connected to the data processing assembly.

[0005] The multi-band capacitive sensor assembly is used to collect capacitive signals in different frequency bands;

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

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

[0008] In one embodiment, the multi-band capacitive sensor assembly includes multiple multi-band capacitive sensors, wherein each multi-band capacitive sensor includes at least one high-frequency electrode, at least one low-frequency electrode, a PCB board, and an insulating material; the substrates of both the high-frequency electrode and the low-frequency electrode are made of spring steel; both the high-frequency electrode and the low-frequency electrode are made of spring steel and have a helical plane formed at their ends; the high-frequency electrode and the low-frequency electrode are welded to the PCB board, and the PCB board is fixed to the outer wall of the liquid container by 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 embodiment, the multi-band capacitive sensor assembly includes a three-dimensional capacitive sensor array, which includes a plurality of three-dimensional capacitive sensors;

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

[0023] In one embodiment, it further includes: a temperature compensation sensor; the temperature compensation sensor is disposed on the inner wall of the liquid container for monitoring the ambient temperature;

[0024] The temperature compensation sensor is connected to the data processing component;

[0025] The data processing component is used to calculate the signal compensation value based on the ambient temperature and a preset compensation algorithm; and to analyze the liquid level information based on the signal compensation value and the target digital signal.

[0026] Secondly, this application also provides a liquid container in which the non-contact liquid height detection system described in the first aspect is installed.

[0027] Thirdly, this application also provides a liquid level detection method, applied to the non-contact liquid level detection system described in the first aspect, the method comprising:

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

[0029] The liquid level height information is obtained by analyzing the target digital signal.

[0030] Fourthly, this application also provides a liquid level detection device, applied to the non-contact liquid level detection system described in the first aspect, the device comprising:

[0031] An acquisition module is used to acquire a target digital signal; wherein the target digital signal is a digital signal obtained after performing preset data processing on the capacitance signals of different frequency bands collected by the multi-band capacitive sensor component;

[0032] The analysis module is used to analyze the target digital signal to obtain liquid level information.

[0033] In summary, this application proposes a non-contact liquid height detection system, liquid level detection method, device, and liquid container, 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 disposed on the outer wall of the liquid container and does not contact the liquid inside the container; the multi-band capacitive sensor assembly is used to collect capacitance signals of different frequency bands; the multi-band signal processing assembly is used to perform preset data processing on the capacitance signals of different frequency bands to obtain a target digital signal; wherein, the preset data processing includes signal amplification, filtering, and analog-to-digital conversion; the data processing assembly is used to analyze the target digital signal to obtain liquid level height information. This application provides a non-contact liquid height detection system that can effectively extend the sensor's service life while ensuring high-precision liquid level detection. Attached Figure Description

[0034] Figure 1 This is a structural block diagram of a non-contact liquid height detection system in one embodiment;

[0035] Figure 2 This is a schematic diagram illustrating an application scenario of a non-contact liquid height detection system in one embodiment.

[0036] Figure 3 This is a schematic diagram of the structure of the high-frequency electrode and the low-frequency electrode in one embodiment;

[0037] Figure 4 This is a schematic diagram of the structure of the high-frequency electrode and the low-frequency electrode in another embodiment;

[0038] Figure 5 This is a flowchart illustrating a liquid level detection method in one embodiment;

[0039] Figure 6 This is a structural block diagram of a liquid level detection device in one embodiment;

[0040] Figure 7 This is a structural block diagram of a computer device in one embodiment.

[0041] Summary of attached image labels:

[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 Implementation

[0043] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[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 herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] It is understood that the terms "first," "second," etc., used herein may be used to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of this application, a first resistor may be referred to as a second resistor, and similarly, a second resistor may be referred to as a first resistor. Both the first resistor and the second resistor are resistors, but they are not the same resistor.

[0046] It is understood that the term "connection" in the following embodiments should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have electrical signal or data transmission with each other.

[0047] It is understandable that "at least one" refers to one or more, and "multiple" refers to two or more. "At least a part of an element" refers to part or all of an element.

[0048] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising / including” or “having,” etc., specify the presence of the stated features, wholes, steps, operations, components, parts, or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof. Meanwhile, the term “and / or” as used in this specification includes any and all combinations of the associated listed items.

[0049] In one embodiment, such as Figure 1 As shown, a non-contact liquid height 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 Figure 2 As shown, the multi-band capacitive sensor assembly 110 is disposed on the outer wall of the liquid container 200, and the multi-band capacitive sensor assembly 110 does not contact the liquid inside 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. Because the multi-band capacitive sensor assembly 110 is disposed on the surface of the liquid container 200, the device structure of the multi-band capacitive sensor assembly 110 will not contact the liquid inside the liquid container 200. In a specific embodiment, the actual placement position of the multi-band capacitive sensor assembly 110 can be a position relative to a preset distance from the bottom of the liquid container 200, which is the liquid level height that the multi-band capacitive sensor assembly 110 needs to detect.

[0051] In this embodiment, the multi-band capacitive sensor assembly 110 is used to acquire capacitive signals of different frequency bands. The capacitive signals of different frequency bands include at least high-frequency capacitive signals and low-frequency capacitive signals. In practical applications, the combination of high-frequency and low-frequency capacitive signals can effectively improve the accuracy of liquid level detection. Specifically, high-frequency capacitive signals have a faster response speed and can be used to capture rapid changes in liquid level height. For example, in scenarios involving rapid liquid injection, the changed liquid level height can be obtained more quickly using high-frequency capacitive signals. Low-frequency capacitive signals are more stable and can be used to correct for fluctuation errors in high-frequency capacitive signals.

[0052] In this embodiment, the multi-band signal processing component 120 is used to perform preset data processing on capacitor signals of different frequency bands to obtain a target digital signal. The preset data processing includes signal amplification, filtering, and analog-to-digital conversion. In practical applications, high-frequency and low-frequency capacitor signals are subject to various interferences due to environmental factors, such as attenuation of low-frequency capacitor signals and fluctuation interference of high-frequency capacitor signals. Therefore, this embodiment performs various data preprocessing steps on capacitor signals of different frequency bands to obtain the target digital signal. The target digital signal includes both high-frequency and low-frequency digital signals.

[0053] In one feasible embodiment, the multi-band signal processing component 120 can also be used to filter out valid capacitor signals. For example, if the rate of change of the high-frequency capacitor signal is greater than or equal to a preset threshold, the fluctuation amplitude of the high-frequency capacitor signal is determined to be too large, i.e., the high-frequency capacitor signal is judged to be a false touch signal. If the rate of change of the high-frequency capacitor signal is less than the preset threshold, the fluctuation amplitude of the high-frequency capacitor signal is determined to be normal, and the high-frequency capacitor signal is determined to be a valid capacitor signal. It should be noted that the specific judgment conditions for the multi-band signal processing component 120 to filter valid capacitor signals can be configured according to the needs of the actual application scenario to adapt to the needs of the actual application scenario.

[0054] In this embodiment, the data processing component 130 is used to analyze the target digital signal to obtain liquid level information. The data processing component 130 in this embodiment can combine a machine learning algorithm (preferably a support vector machine algorithm) to establish a mapping model between the change in capacitance signal and the liquid level. This utilizes the difference in dielectric constant between liquid and air (water has a dielectric constant of approximately 50-80, while air has approximately 1), and based on 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, to infer the liquid level height from the change in capacitance signal.

[0055] In this embodiment, a liquid level analysis model can be pre-configured in the data processing component 130. This model can be trained using machine learning. For example, liquid level change data can be collected using a multi-band capacitive sensor to construct a training dataset. Specifically, after arranging the multi-band signal processing component 120 outside the liquid container 200, liquid of a certain height is injected into the container 200, and the liquid level is measured step by step from 0% to 100%, recording the high-frequency and low-frequency capacitance values ​​corresponding to each liquid level. The high-frequency and low-frequency capacitance values ​​are normalized to avoid the influence of dimensional differences on model training. Features such as the difference, ratio, and derivative of the high-frequency and low-frequency capacitance values ​​are extracted to enhance the model's sensitivity to liquid level changes. 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 through backpropagation. The model performance is verified on the test set, and the mean squared error and coefficient of determination are calculated.

[0056] During actual use of the liquid container 200, 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 be verified through actual measurement. Abnormal data is detected through residual analysis (the difference between the predicted and actual values). If the residual exceeds a threshold, such as ±3%, manual calibration is triggered.

[0058] In summary, this embodiment provides a non-contact liquid height detection system. The multi-band capacitive sensor assembly 110 does not need to directly contact the liquid, thus avoiding sensor contamination and solving the problem of contact sensors being easily corroded by liquids. Furthermore, the sensor maintains detection accuracy even in complex environments with inconsistent light transmittance or numerous impurities in the liquid. Compared with existing technologies, the non-contact liquid height detection system provided in this embodiment effectively improves safety, anti-interference capabilities, and intelligence.

[0059] In one embodiment, such as Figure 3 and Figure 4As shown, the multi-band capacitive sensor assembly 110 includes multiple multi-band capacitive sensors, wherein each multi-band capacitive sensor includes at least one high-frequency electrode 111, at least one low-frequency electrode 112, a PCB board 113, and insulating material.

[0060] In this embodiment, the substrates of both the high-frequency electrode 111 and the low-frequency electrode 112 are made of spring steel. Both the high-frequency electrode 111 and the low-frequency electrode 112 are made of spring steel wound with helical planes formed at the ends. Specifically, the actual structures of the high-frequency electrode 111 and the low-frequency electrode 112 are as follows: Figure 3 As shown, the spiral diameter of the high-frequency electrode 111 is smaller than that of the low-frequency electrode 112 to adapt to the short-wavelength characteristics of high-frequency signals and reduce signal interference. In practical applications, the initial pre-pressure of the high-frequency electrode 111 is greater than that of the low-frequency electrode 112. This pre-pressure lowers the signal trigger threshold, further improving the signal acquisition sensitivity of the high-frequency electrode 111, thus enabling more sensitive monitoring of changes in the liquid level. The initial pre-pressure is the spring pressure when the electrode is not pressed.

[0061] like Figure 4 As shown, high-frequency electrode 111 and low-frequency electrode 112 are soldered onto PCB board 113, which is fixed to the outer wall of liquid container 200 by insulating material. In this embodiment, high-frequency electrode 111 and low-frequency electrode 112 are soldered onto PCB board 113, wherein PCB board 113 is made of silicon substrate, which has good insulation properties. PCB board 113 is fixed to the outer wall of the container by insulating material, ensuring that the sensor is in close contact with the container wall and has no electrical conductivity. The insulating material can be, for example, polytetrafluoroethylene (PTFE), which has strong temperature resistance and excellent insulation properties.

[0062] In one embodiment, the high-frequency electrode 111 is coated with graphene material on the spiral plane, and the low-frequency electrode 112 is coated with carbon nanotube material on the spiral plane.

[0063] In this embodiment, the substrates of both the high-frequency electrode 111 and the low-frequency electrode 112 are made of spring steel, which has both elasticity and conductivity. A spiral plane can be formed at the end through a winding process to improve the stability of signal acquisition.

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

[0065] In one embodiment, the system further includes a display component 150 and an alarm component 140. A data processing component 130 is connected to both the display component 150 and the alarm component 140. In this embodiment, the display component 150 and the alarm component 140 can be connected to the data processing component 130 using wireless communication technology. The data processing component 130 transmits liquid level information to the corresponding display component 150 and alarm component 140 via Bluetooth or WiFi to display the liquid level or to perform alarm processing.

[0066] The data processing component 130 is used to send a display control signal to the display component 150 based on 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 also used 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 a preset alarm processing according to the alarm control signal.

[0067] In this embodiment, the display component 150 and the alarm component 140 can be directly mounted on the liquid container 200, or they can be mounted on other mobile device terminals or cloud platforms. The display component 150 can be a display screen or an LED indicator. The alarm component 140 can perform alarm processing such as sound, light, and mobile phone notifications. 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 method and the specific alarm control method, can be adaptively configured according to the needs of the actual application scenario.

[0068] In one embodiment, 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 converter unit 124. One end of the low-frequency amplification unit 122 is connected to a 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 a 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 converter unit 124.

[0069] The low-frequency amplification unit 122 amplifies the low-frequency capacitor signal. The high-frequency amplification unit 121 amplifies the high-frequency capacitor signal. The multi-band filtering unit 123 filters the amplified low-frequency and high-frequency capacitor signals. The analog-to-digital conversion unit 124 converts the filtered low-frequency and high-frequency capacitor signals to digital signals to obtain the target digital signal; the target digital signal includes both low-frequency and high-frequency digital signals.

[0070] In this embodiment, the multi-band signal processing component 120 is mainly used to convert the analog signals collected by the sensor into analyzable digital signals. The low-frequency amplification unit 122 can be a low-frequency signal amplifier, with its input connected to the low-frequency electrode 112 and its output connected to the multi-band filter unit 123. The low-frequency amplification unit 122 amplifies the low-frequency capacitance signal, and the amplification factor can be dynamically adjusted according to the signal strength to avoid detection errors caused by low-frequency signal attenuation.

[0071] The high-frequency amplification unit 121 can be a high-frequency signal amplifier, with the input end connected to the high-frequency electrode 111 and the output end connected to the multi-band filter unit 123. The high-frequency signal amplifier is used to amplify the high-frequency capacitor signal in a targeted manner. High-frequency signals are easily interfered with, and the amplification factor needs to be matched with the low-frequency signal to ensure the consistency of subsequent data processing.

[0072] The multi-band filtering unit 123 can employ a tunable filter to separately filter the amplified high-frequency and low-frequency signals, removing electromagnetic interference (such as motor interference and radio frequency interference in industrial environments) and environmental noise (such as signal fluctuations caused by vibration), while retaining the effective capacitance signal. In practical applications, the multi-band filtering unit 123 can also use a bandpass filter (100kHz-1MHz) to filter high-frequency noise and retain high-frequency capacitance change signals. A low-pass filter (cutoff frequency 500Hz) can be used to suppress transient jitter in high-frequency signals (such as accidental touch signals). A low-pass filter (cutoff frequency 10Hz) can be used to smooth low-frequency capacitance values ​​and suppress slow-changing interference such as temperature and humidity.

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

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

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

[0076] In this embodiment, the multi-band capacitive sensor assembly 110 can also be a three-dimensional capacitive sensor array, composed of multiple three-dimensional capacitive sensors, suitable for tilted containers or irregularly shaped containers (such as conical tanks or irregularly shaped reactors). The three-dimensional capacitive sensor array can simultaneously monitor liquid height and horizontal position offset by acquiring capacitance signals from multiple directions, avoiding detection errors caused by container tilt.

[0077] Based on the above steps, a three-dimensional capacitive sensor array can monitor the horizontal displacement of the liquid level in real time. For example, when the water tank is tilted, the liquid level is higher on the left and lower on the right. The data processing component 130 calculates the actual liquid level height by fusing signals from multiple directions, which is suitable for irregular container scenarios in industry.

[0078] In one embodiment, the non-contact liquid height detection system further includes a temperature compensation sensor. The temperature compensation sensor is disposed on the inner wall of the liquid container 200 for monitoring the ambient temperature.

[0079] The temperature compensation sensor and data processing component 130 are connected.

[0080] The data processing component 130 is used to calculate the signal compensation value based on the ambient temperature and the preset compensation algorithm; and to analyze the liquid level height information based on 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 attached to the inside of the liquid container 200, such as the middle of the inner wall of the reactor; the data processing component 130 optimizes the compensation algorithm and dynamically adjusts the capacitance signal compensation coefficient based on the temperature-dielectric constant curve. The temperature-dielectric constant curve can indicate the relationship between temperature value 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 compensated detection error can still be effectively controlled at a high temperature of 150℃, and the non-contact installation of the capacitance detection sensor avoids sulfuric acid corrosion, which can effectively meet the needs of precision testing in the laboratory.

[0083] In summary, this embodiment provides a non-contact liquid height detection system. The sensor assembly is installed on the outer wall of the container, without contacting the liquid, thus completely avoiding liquid corrosion and impurity adhesion problems. This effectively extends the sensor's lifespan and prevents liquid contamination, making it suitable for high-precision applications such as food and pharmaceuticals. Through the coordinated acquisition of high-frequency and low-frequency signals, combined with multi-frequency filtering, it effectively resists electromagnetic interference and liquid turbidity / color interference, significantly improving detection accuracy in industrial electromagnetic environments or laboratory solutions containing impurities. Temperature compensation eliminates the influence of temperature changes on the capacitance signal, the three-dimensional sensor array adapts to irregular containers, and dynamic calibration adapts to equipment drift after long-term use, covering multiple scenarios including home, industry, and laboratories.

[0084] In one embodiment, such as Figure 5 As shown, a liquid level detection method is provided, which can be applied to... Figure 1 Taking the data processing component of a non-contact liquid height detection system as an example, the following steps are included:

[0085] S501, acquire the target digital signal; wherein, the target digital signal is a digital signal obtained after performing preset data processing on the capacitance signals of different frequency bands collected by the multi-band capacitive sensor component;

[0086] S502, the liquid level information is obtained by analyzing the target digital signal.

[0087] In one embodiment, the liquid level detection method further includes:

[0088] The system sends a display control signal to the display component based on the liquid level information, so that the display component can display the liquid level information according to the display control signal.

[0089] In one embodiment, the liquid level detection method further includes:

[0090] If the liquid level information is greater than or equal to a preset height threshold, an alarm control signal is sent to the alarm component so that the alarm component can perform preset alarm processing according to the alarm control signal.

[0091] In one embodiment, acquiring the target digital signal includes:

[0092] Acquire low-frequency and high-frequency capacitor signals;

[0093] The low-frequency capacitor signal and the high-frequency capacitor signal are amplified separately.

[0094] The amplified low-frequency capacitor signal and high-frequency capacitor signal are filtered.

[0095] The filtered low-frequency and high-frequency capacitor signals are processed by analog-to-digital conversion to obtain the target digital signal; the target digital signal includes both low-frequency and high-frequency digital signals.

[0096] In one embodiment, the liquid level detection method further includes:

[0097] Obtain the ambient temperature;

[0098] The signal compensation value is calculated based on the ambient temperature and a preset compensation algorithm.

[0099] The liquid level height information is obtained by analyzing the signal compensation value and the target digital signal.

[0100] In summary, this embodiment provides a liquid level detection method. The sensor assembly is installed on the outer wall of the container, without contacting the liquid, thus completely avoiding liquid corrosion and impurity adhesion problems. This effectively extends the sensor's lifespan and prevents liquid contamination, making it suitable for high-precision applications such as food and pharmaceuticals. Through the coordinated acquisition of high-frequency and low-frequency signals, combined with multi-frequency filtering, it effectively resists electromagnetic interference and liquid turbidity / color interference, significantly improving detection accuracy in industrial electromagnetic environments or laboratory solutions containing impurities. Temperature compensation eliminates the influence of temperature changes on the capacitance signal, the three-dimensional sensor array adapts to irregular containers, and dynamic calibration adapts to equipment drift after long-term use, covering multiple scenarios including home, industry, and laboratories.

[0101] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0102] Based on the same inventive concept, this application also provides a liquid level detection device for implementing the liquid level detection method described above. The solution provided by this device is similar to the solution described in the above method; therefore, the specific limitations in one or more embodiments of the liquid level detection device provided below can be found in the limitations of the liquid level detection method described above, and will not be repeated here.

[0103] In one embodiment, such as Figure 6 As shown, a liquid level detection device 600 is provided, including: an acquisition module 610 and an analysis module 620, wherein:

[0104] The acquisition module 610 is used to acquire a target digital signal; wherein, the target digital signal is a digital signal obtained after performing preset data processing on the capacitance signals of different frequency bands collected by the multi-band capacitive sensor component;

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

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

[0107] The control module is used to send a display control signal to the display component based on the liquid level information, so that the display component can display the liquid level information according to the display control signal.

[0108] In one embodiment, the control module is further configured 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.

[0109] In one embodiment, the acquisition module is specifically used to acquire low-frequency capacitor signals and high-frequency capacitor signals; amplify the low-frequency capacitor signals and high-frequency capacitor signals respectively; filter the amplified low-frequency capacitor signals and high-frequency capacitor signals; and perform analog-to-digital conversion on the filtered low-frequency capacitor signals and high-frequency capacitor signals to obtain a target digital signal; the target digital signal includes low-frequency digital signals and high-frequency digital signals.

[0110] In one embodiment, the analysis module is specifically used to acquire the ambient temperature; calculate the signal compensation value based on the ambient temperature and a preset compensation algorithm; and analyze the liquid level information based on the signal compensation value and the target digital signal.

[0111] In summary, this embodiment also provides a liquid level detection device. The sensor assembly is installed on the outer wall of the container, without contacting the liquid, thus completely avoiding liquid corrosion and impurity adhesion problems. This effectively extends the sensor's lifespan and prevents liquid contamination, making it suitable for high-precision applications such as food and pharmaceuticals. Through the coordinated acquisition of high-frequency and low-frequency signals, combined with multi-frequency filtering, it effectively resists electromagnetic interference and liquid turbidity / color interference, significantly improving detection accuracy in industrial electromagnetic environments or laboratory solutions containing impurities. Temperature compensation eliminates the influence of temperature changes on the capacitance signal, the three-dimensional sensor array adapts to irregular containers, and dynamic calibration adapts to equipment drift after long-term use, covering multiple scenarios including home, industry, and laboratories.

[0112] Each module in the aforementioned liquid level detection device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0113] In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: 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] 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;

[0120] The liquid level height information is obtained by analyzing the target digital signal.

[0121] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0122] 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;

[0123] The liquid level height information is obtained by analyzing the target digital signal.

[0124] Those skilled in the art will understand that all or part of the processes in the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium. When executed, the computer program can include the processes of the embodiments described above. Any references to memory, databases, or other media used in the embodiments provided in this 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 memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0125] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0126] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by 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 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 data processing assembly is used for analyzing the target digital signals to obtain liquid level height information.

2. The system of claim 1, wherein, The multi-frequency-band capacitive sensor assembly comprises a plurality of multi-frequency-band capacitive sensors.

3. The system of claim 2, wherein, The high-frequency electrode and the low-frequency electrode are both made of spring steel material and are wound and formed into spiral planes at the ends.

4. The system of claim 2, wherein, 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.

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

6. The system of claim 1, wherein, The initial pre-pressure of the high-frequency electrode is greater than that of the low-frequency electrode, and the spiral diameter of the high-frequency electrode is smaller than that of the low-frequency electrode. The application further relates to a display assembly and an alarm assembly. The data processing assembly is used for sending a display control signal to the display assembly according to the liquid level height information, so that the display assembly displays the liquid level height 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 height 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.

7. The system of claim 2, wherein, The multi-frequency-band signal processing assembly comprises a low-frequency amplification unit, a high-frequency amplification unit, a multi-frequency-band filter unit and an analog-digital conversion unit. 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-to-digital conversion unit; The low-frequency amplification unit is used for signal amplification processing of the low-frequency capacitive signal; The high-frequency amplification unit is used for signal amplification processing of the high-frequency capacitive signal; The multi-frequency band filtering unit is used for filtering processing of the amplified low-frequency capacitive signal and high-frequency capacitive signal; The analog-to-digital conversion unit is used for analog-to-digital conversion processing of 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.

8. The system of claim 1, wherein, The multi-frequency 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 the outer wall of the liquid container.

9. The system of claim 1, wherein, Further comprising: A temperature compensation sensor is arranged on the inner wall of the liquid container and used for monitoring the ambient temperature; The temperature compensation sensor is connected to the data processing assembly; The data processing assembly is used for calculating a signal compensation value according to the ambient temperature and a preset compensation algorithm, and analyzing liquid level information according to the signal compensation value and the target digital signal.

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 the multi-frequency 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 is 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 the multi-frequency band capacitive sensor assembly; An analyzing module is configured to analyze liquid level information according to the target digital signal.

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