External magnetostriction guided wave closed container liquid level measuring method

Abstract

The invention relates to the technical field of detection, particularly discloses a liquid level measurement method for an external magnetostrictive guided wave closed container, and relates to the technical field of liquid level measurement. According to the method, an external magnetostrictive guided wave device is adopted and comprises a waveguide assembly, an excitation and detection circuit and an intelligent processing unit. An annular magnetic field is generated through excitation current pulses, magnetic field changes caused by liquid level changes are induced, torsional wave pulses are generated, and the liquid level is obtained through detection and calculation of an algorithm model. The innovation point lies in seven technologies such as an external structure, novel materials and multi-mode induction, the problems that a traditional method is low in precision, narrow in application range, difficult to maintain and the like are solved, and the liquid level sensor has the advantages of being high in precision, wide in application range, easy to maintain and the like and can be widely applied to industrial liquid level measurement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of liquid level measurement, and particularly relates to a kind of external magnetostrictive waveguide closed container liquid level measurement method. BACKGROUND

[0002] In industrial production and daily life, the accurate measurement of the liquid level in various closed containers is of great significance. For example, in the petroleum and chemical industry, the accurate monitoring of the liquid level in containers such as oil tanks and reaction kettles is directly related to the safety and efficiency of production. In the food and beverage industry, accurate control of the liquid level in storage tanks helps to optimize production processes and inventory management. Currently, there are many common liquid level measurement methods, among which magnetostrictive liquid level measurement technology has been widely applied due to its unique advantages. Traditional magnetostrictive liquid level meters are mainly composed of a probe rod, a circuit unit and a float. During measurement, the current pulse generated by the circuit unit is transmitted downward along the magnetostrictive line, generating a ring-shaped magnetic field that meets the magnetic field generated by the permanent magnet in the float, triggering a "distorted" pulse, i.e. a "return" pulse. The position of the float is determined by calculating the time difference between the "return" pulse and the current pulse, and the liquid level is obtained accordingly.

[0003] However, the existing liquid level measurement technology still has many problems to be solved:

[0004] Limited measurement accuracy: In practical applications, existing magnetostrictive liquid level meters are affected by various factors such as signal transmission attenuation, noise, and complex environments in the container (such as the characteristics of the medium, temperature changes, etc.), making it difficult to meet the increasingly high industrial demand for measurement accuracy. For example, in some highly precise chemical production processes, the accuracy of existing liquid level meters cannot ensure precise control of production, which may lead to unstable product quality and other problems.

[0005] Limited scope of application: For some special conditions of closed containers, such as high temperature, high pressure and strong corrosion environment, traditional liquid level measurement methods face many challenges. For example, in high temperature environments, the permanent magnet in the float is prone to demagnetization, resulting in increased measurement error or even failure of the liquid level meter. In strong corrosive environments, key components of the measurement device are easily corroded, significantly shortening the service life and increasing maintenance costs.

[0006] Installation and maintenance are not convenient: The installation of some liquid level measurement devices requires significant modifications to the container, which is complex and costly. At the same time, due to the complexity of the structure and the vulnerability of the components, maintenance work is difficult and time-consuming, which can seriously affect the continuity of production. For example, some built-in liquid level measurement devices need to empty the container during maintenance, which not only consumes a lot of manpower and resources, but also causes production to stop, resulting in economic losses.

[0007] In summary, it has important practical significance and broad application prospects to develop a new liquid level measurement method that can effectively overcome the above problems. SUMMARY

[0008] The application aims to provide a kind of external magnetostrictive waveguide closed container liquid level measurement method, comprising the following steps:

[0009] Step one: install a magnetostrictive waveguide device outside the closed container, the magnetostrictive waveguide device includes a magnetostrictive waveguide assembly, an excitation and detection circuit system and an intelligent data processing unit, the magnetostrictive waveguide assembly is composed of a waveguide wire and a magnetic induction structure surrounding it, and the magnetic induction structure is closely attached to the container wall.

[0010] Step two: the excitation and detection circuit system inputs a specific excitation current pulse to the waveguide wire, and the current generates a circumferential ampere ring magnetic field around the waveguide wire.

[0011] Step three: when the liquid level in the container changes, the change of the liquid level height causes the change of the magnetic field distribution near the container wall, the magnetic induction structure perceives the change of the magnetic field and transmits it to the waveguide wire, and the ampere ring magnetic field around the waveguide wire interacts with the magnetic field generated by the change of the liquid level, so that the waveguide wire generates a torsional wave pulse at the corresponding position.

[0012] Step four: the excitation and detection circuit system detects the propagation time of the torsional wave pulse and transmits the data to the intelligent data processing unit.

[0013] Step five: the intelligent data processing unit analyzes and calculates the propagation time by using a liquid level calculation model based on multi-parameter fusion to obtain the liquid level height, and the calculation formula of the liquid level calculation model based on multi-parameter fusion is H=f(A,W,V,T,S,M), wherein H is the liquid level height, A is the excitation current pulse amplitude, W is the excitation current pulse width, V is the torsional wave pulse propagation speed, T is the torsional wave pulse propagation time, S is the container cross-sectional area, and M is the container material related coefficient, and the function f is determined by machine learning algorithm and mathematical fitting method.

[0014] Further, the external magnetostrictive waveguide closed container liquid level measurement method, characterized in that in step five, the intelligent data processing unit processes the received data by using an adaptive noise suppression and signal enhancement model before performing liquid level calculation, the adaptive noise suppression and signal enhancement model is based on adaptive least mean square error (LMS) algorithm, and constantly adjusts the coefficients of the filter according to the statistical characteristics of the signal and the noise, so as to minimize the mean square error of the filter output signal.

[0015] Further, an external magnetostrictive guided wave closed container liquid level measuring device is provided, comprising a magnetostrictive waveguide assembly, an excitation and detection circuit system, and an intelligent data processing unit; the magnetostrictive waveguide assembly is installed outside the closed container and is composed of a waveguide wire and a magnetic induction structure surrounding the outside of the waveguide wire, and the magnetic induction structure is tightly attached to the container wall; the excitation and detection circuit system is connected to the waveguide wire and is used for inputting an excitation current pulse to the waveguide wire and detecting the propagation time of the torsional wave pulse; the intelligent data processing unit is connected to the excitation and detection circuit system and is used for receiving data and calculating the liquid level height by using a liquid level calculation model based on multi-parameter fusion.

[0016] Further, the waveguide wire is made of a new type of magnetostrictive material with high magnetostrictive coefficient, low hysteresis loss, and good temperature stability.

[0017] Further, the magnetic induction structure is made of a soft magnetic material with high magnetic permeability and is designed to be in close contact with the container wall.

[0018] Further, the excitation and detection circuit system includes an excitation circuit and a detection circuit, the excitation circuit can generate an excitation current pulse with adjustable pulse amplitude, width, and frequency, the detection circuit uses a high-sensitivity sensor and signal conditioning technology to accurately capture the torsional wave pulse signal and convert it into an electrical signal, and the circuit system is equipped with shielding, filtering, and anti-interference measures.

[0019] Further, the intelligent data processing unit is based on high-performance microprocessors and algorithm software and has data processing, analysis, storage, and communication functions, and can interact with the upper computer or other control systems.

[0020] Further, the magnetostrictive waveguide assembly is installed outside the container through special fixing devices, which can ensure reliable connection of the magnetostrictive waveguide assembly with the container wall and do not affect the normal operation and safety of the container.

[0021] Further, the intelligent data processing unit also has a self-adaptive dynamic calibration mechanism, which can monitor the working state and measurement data changes in real time, and when the measurement error is detected to be beyond the allowed range, the self-adaptive dynamic calibration program is automatically started to adjust the measurement parameters and algorithm model.

[0022] Further, the magnetostrictive guided wave device adopts a distributed measurement architecture, multiple magnetostrictive guided wave measurement nodes are arranged at different positions outside the container, each measurement node can independently measure the liquid level and transmit data to the intelligent data processing unit, and has a redundant backup function, when a measurement node fails, the system automatically switches to other normal nodes for measurement.

[0024] Beneficial effects:

[0025] Significant improvement in measurement accuracy: Through the innovative algorithm model and multi-parameter fusion liquid level calculation method, various factors affecting the liquid level measurement are fully considered, effectively eliminating the noise interference in the signal transmission process, improving the accuracy and reliability of the signal. Experimental results show that the liquid level measurement accuracy of the invention is improved by an order of magnitude compared with the traditional magnetostrictive liquid level meter, which can meet the high-precision requirements of industrial application scenarios.

[0026] Significant expansion of application scope: The application of new magnetostrictive materials and the adoption of multi-modal magnetic field sensing technology enable the liquid level measurement device to work stably in harsh environments such as high temperature, high pressure, and strong corrosion, effectively solving the limitations of traditional liquid level measurement methods in special working conditions. Whether in high-temperature reaction kettles in the petrochemical industry or high-pressure vessels in the marine engineering field, the liquid level measurement method of the invention can perform outstanding performance.

[0027] More convenient installation and maintenance: The external structure design makes the installation process unnecessary to make complex modifications to the container, greatly shortening the installation time and reducing the installation cost. At the same time, the application of distributed measurement and redundant backup technology, as well as intelligent fault diagnosis and prediction function, makes the maintenance work more simple and efficient. Maintenance personnel can real-time understand the running state of the device through the remote monitoring system, find and solve potential problems in advance, reduce the workload and difficulty of on-site maintenance, and improve the continuity and stability of production.

[0028] Intelligent and remote monitoring capabilities: The integration of wireless communication and remote monitoring functions, as well as the realization of intelligent fault diagnosis and prediction functions, enable the liquid level measurement device to have intelligent and remote management capabilities. Users can remotely monitor liquid level changes at any time and anywhere through mobile phones, computers, and other terminal devices, and timely grasp the production situation. At the same time, the intelligent function of the system can automatically diagnose faults and provide solutions, providing users with more convenient and efficient services, improving the level and efficiency of production management. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 : Liquid level measurement principle flowchart;

[0030] Figure 2 : Self-adaptive calibration flowchart;

[0031] Figure 3 : Distributed measurement flowchart. DETAILED DESCRIPTION

[0032] Example 1

[0033] The application discloses a kind of external magnetostrictive waveguide closed container liquid level measurement method, to significantly improve liquid level measurement precision, effectively expand applicable scope, greatly simplify installation and maintenance process, meet the demand of accurate measurement of closed container liquid level under different working conditions.The application adopts unique external structure design, and sets up magnetostrictive waveguide device outside closed container.The device mainly includes magnetostrictive waveguide assembly, excitation and detection circuit system and intelligent data processing unit.

[0034] Magnetostrictive waveguide assembly is made of waveguide wire of special magnetostrictive material and magnetic induction structure surrounding it.When excitation and detection circuit system input specific excitation current pulse to waveguide wire, according to Ampere's law, circumferential ampere annular magnetic field is generated around waveguide wire.

[0035] When liquid level in container changes, the change of liquid level height will cause the corresponding change of magnetic field distribution near container wall.Because magnetic induction structure is closely attached to container wall, it can sensitively perceive this magnetic field change and transmit it to waveguide wire.When circumferential ampere annular magnetic field around waveguide wire and magnetic field generated due to liquid level change interact, according to magnetostrictive effect, waveguide wire will generate torsional wave pulse at corresponding position.

[0036] Torsional wave pulse propagates along waveguide wire at specific speed, and excitation and detection circuit system can accurately detect propagation time of torsional wave pulse.Through intelligent data processing unit, innovative algorithm model is used to analyze and calculate propagation time, so that liquid level height is accurately obtained.

[0037] Liquid level calculation model based on multi-parameter fusion:the application constructs a new liquid level calculation model based on multi-parameter fusion, which fully considers various key factors affecting liquid level measurement.The model comprehensively analyzes characteristic parameters (such as pulse amplitude, pulse width, etc.) of excitation current pulse, propagation characteristics (such as propagation speed, propagation time, etc.) of torsional wave pulse and physical parameters (such as container shape, size, material, etc.) of container.Through a large amount of experimental data training and optimization, accurate mathematical relationship between these parameters and liquid level height is established.Specifically, the calculation formula of liquid level height H is as follows: H=f (A, W, V, T, S, M) Wherein, A represents excitation current pulse amplitude, W represents excitation current pulse width, V represents torsional wave pulse propagation speed, T represents torsional wave pulse propagation time, S represents container cross-sectional area, and M represents container material related coefficient.The function f is determined through complex machine learning algorithm and mathematical fitting method, and can highly accurately reflect the nonlinear relationship between each parameter and liquid level height.

[0038] Adaptive noise suppression and signal enhancement model: To effectively solve the problem of noise interference in signal transmission, the present application designs an adaptive noise suppression and signal enhancement model. Based on advanced digital signal processing technology and adaptive filtering algorithm, this model can monitor the characteristics of input signal and noise characteristics in real time. By dynamically adjusting the parameters of the filter, it can accurately identify and effectively suppress noise, while enhancing the strength of useful signals. In the specific implementation process, the adaptive least mean square error (LMS) algorithm is used, which continuously adjusts the coefficients of the filter according to the statistical characteristics of the signal and noise, so that the mean square error of the filter output signal is minimized. After processing by this model, the signal-to-noise ratio is significantly improved, effectively improving the accuracy and stability of the liquid level measurement.

[0039] External magnetostrictive waveguide assembly: The waveguide wire is made of a new type of magnetostrictive material with high magnetostrictive coefficient, low hysteresis loss and good temperature stability, ensuring stable operation under various complex working conditions. The magnetic induction structure is designed to closely fit the shape of the container wall, using soft magnetic materials with high permeability to efficiently induce the magnetic field changes near the container wall and accurately transmit them to the waveguide wire. The installation of the waveguide assembly uses special fixing devices to ensure reliable connection with the container wall, while not affecting the normal operation and safety of the container.

[0040] Excitation and detection circuit system: The excitation circuit part can generate high-precision and high-stability excitation current pulses, with parameters such as pulse amplitude, width and frequency being flexible adjusted according to actual measurement requirements. The detection circuit uses high-sensitivity sensors and advanced signal conditioning technology to accurately capture the torsional wave pulse signal and convert it into an electrical signal suitable for subsequent processing. The circuit system is also equipped with perfect anti-interference measures such as shielding and filtering, effectively reducing the influence of external electromagnetic interference on the measurement signal.

[0041] Intelligent data processing unit: Based on high-performance microprocessors and advanced algorithm software, this unit has powerful data processing and analysis capabilities. It can receive data from the excitation and detection circuit system in real time and use innovative algorithm models for liquid level calculation and data processing. At the same time, the intelligent data processing unit also has data storage and communication interface functions, which can easily interact with the host computer or other control systems for remote monitoring and automatic control.

[0042] External structure innovation: Abandoning the traditional built-in measurement method, a new external structure design is adopted. The magnetostrictive waveguide device is installed outside the closed container, avoiding direct contact with the container medium, effectively solving the damage caused by medium corrosion, pollution, etc. to the measuring device, significantly improving the service life and reliability of the device. At the same time, the external structure makes the installation process more simple, without the need for large-scale modification of the container, reducing the installation cost and construction difficulty.

[0043] New magnetostrictive material application: Choose a new magnetostrictive material with unique performance to make waveguide wire. This material not only has higher magnetostrictive coefficient, can produce stronger torsional wave pulse signal, improve the measurement sensitivity; And has excellent temperature stability and fatigue resistance, can still maintain stable magnetostrictive properties in high temperature, high pressure and other harsh environments, effectively solves the performance decline problem of traditional materials in special working conditions, and widens the application range of liquid level measuring device.

[0044] Multi-modal magnetic field sensing technology: Innovative introduction of multi-modal magnetic field sensing technology. By designing multiple different types of magnetic field sensing elements in the magnetic sensing structure, the strength, direction and change rate of the magnetic field near the container wall can be sensed at the same time. These multi-modal magnetic field information complement each other, providing more abundant and accurate data basis for liquid level measurement. Advanced signal fusion algorithm is used to process multi-modal magnetic field signals, effectively improving the detection accuracy and anti-interference ability of liquid level change.

[0045] Adaptive dynamic calibration mechanism: An adaptive dynamic calibration mechanism is established. During operation, the intelligent data processing unit can monitor the working state and change of measurement data in real time. By comparing and analyzing with the pre-set standard parameters and model, it can automatically identify the measurement error caused by environmental factors change (such as temperature, pressure fluctuation) or device aging. Once the error exceeds the allowed range, the system immediately starts the adaptive dynamic calibration program, automatically adjusts the measurement parameters and algorithm model according to the real-time collected data and pre-set calibration algorithm, realizes dynamic calibration of liquid level measurement, and ensures high-precision measurement results in various complex working conditions.

[0046] Distributed measurement and redundancy backup technology: Adopt distributed measurement architecture, arrange multiple magnetostrictive waveguide measurement nodes at different positions outside the container. Each measurement node can independently measure the liquid level and transmit the measurement data to the intelligent data processing unit. Through the fusion processing of multiple measurement node data, not only the accuracy and reliability of liquid level measurement can be improved, but also the overall monitoring of liquid level distribution in the container can be realized. At the same time, the redundancy backup technology is introduced, when a measurement node fails, the system can automatically switch to other normal nodes for measurement, ensuring the continuity and stability of liquid level measurement, effectively improving the fault tolerance and availability of the whole liquid level measurement system.

[0047] Wireless communication and remote monitoring function integration: The wireless communication technology is deeply integrated with the liquid level measurement device, realizing the wireless transmission of measurement data. The intelligent data processing unit sends the liquid level measurement data to the remote monitoring center or mobile terminal device in real time through the wireless communication module (such as Bluetooth, Wi-Fi, 4G / 5G, etc.). Users can access the monitoring system through the Internet at any time and anywhere, and view the changes of the liquid level in the container in real time, and perform remote operation and management. In addition, the remote monitoring system also has an alarm function, which can send alarm information to the user in time when the liquid level exceeds the preset safety range or the device appears abnormal, so that the user can take timely measures to ensure production safety.

[0048] Intelligent fault diagnosis and prediction function: The liquid level measurement device has intelligent fault diagnosis and prediction function. The intelligent data processing unit can diagnose whether the device has faults in real time and predict potential faults by deeply analyzing the measurement data, device running state parameters and historical data, using machine learning and artificial intelligence algorithms. Once a fault or hidden danger is detected, the system generates a detailed fault report immediately, including fault type, fault location, possible cause and suggested solution, etc. At the same time, through the linkage with the remote monitoring center, technicians can analyze and handle the fault remotely, arrange maintenance plan in advance, reduce equipment downtime and improve production efficiency.

[0049] Example 2

[0050] Application in liquid level measurement of petroleum storage tank: A large cylindrical sealed storage tank for storing crude oil is selected, with a diameter of 10 meters and a height of 15 meters. First, according to the size and shape of the storage tank, the appropriate length and specification of the external magnetostrictive waveguide assembly are customized. The waveguide assembly is tightly installed on the outer wall of the storage tank through a specially designed fixing clamp, ensuring that the magnetic induction structure is in full contact with the tank wall. The excitation and detection circuit system is installed in the control room near the storage tank, connected with the magnetostrictive waveguide assembly through shielded cable to reduce electromagnetic interference. The intelligent data processing unit uses a high-performance industrial computer, which is also placed in the control room and communicates with the excitation and detection circuit system through a data bus.

[0051] Parameter setting and calibration: According to the physical parameters of the storage tank (such as diameter, height, material, etc.) and the characteristics of the crude oil (such as density, magnetic permeability, etc.), the relevant parameters of the liquid level calculation model based on multi-parameter fusion are set in the intelligent data processing unit. At the same time, the initial calibration of the liquid level measurement device is carried out by using a standard liquid level gauge. By injecting different heights of crude oil into the storage tank, the difference between the measurement value of the device and the measurement value of the standard liquid level gauge is recorded, and the liquid level calculation model is fine-tuned to ensure the measurement accuracy.

[0052] Liquid level measurement and data monitoring: start the liquid level measurement device, and the excitation and detection circuit system sends a specific excitation current pulse to the waveguide wire. With the change of the crude oil liquid level, the magnetostrictive waveguide assembly senses the change of the magnetic field near the container wall, and generates a corresponding torsional wave pulse. The excitation and detection circuit system detects the propagation time of the torsional wave pulse, and transmits the data to the intelligent data processing unit. The intelligent data processing unit uses an innovative algorithm model, combined with the pre-set parameters, to calculate the real-time liquid level height, and transmits the liquid level data to the remote monitoring center through the wireless communication module. On the monitoring interface of the remote monitoring center, the operator can real-time view the change curve of the crude oil liquid level in the storage tank, the current liquid level height and the historical liquid level data and other information.

[0053] Performance evaluation and comparison: in the application of liquid level measurement of the oil storage tank, the external magnetostrictive guided wave liquid level measurement method of the application is compared with the traditional internal magnetostrictive liquid level meter. After one month of continuous operation monitoring, the measurement accuracy of the device of the application is always maintained within ±1mm, while the measurement error of the traditional liquid level meter is about ±10mm. At the same time, when dealing with the temperature fluctuation of crude oil (the highest temperature can reach 60℃) and the complex electromagnetic environment in the storage tank, the device of the application shows good stability and anti-interference ability, and there is no problem of increased measurement error or device failure caused by environmental factors. While in the high temperature environment, due to the demagnetization of the permanent magnet in the float of the traditional liquid level meter, the measurement error increases obviously, and when the electromagnetic interference is strong, the signal fluctuates obviously, which affects the accuracy and reliability of the measurement.

[0054] Example 2

[0055] Application in liquid level measurement of chemical reaction kettle

[0056] Device adaptation and installation: for a high-pressure reaction kettle used for chemical synthesis reaction, its working pressure can reach 5MPa, the internal temperature can be as high as 150℃, and the reaction medium has strong corrosiveness. According to the special working conditions of the reaction kettle, the liquid level measurement device of the application is specially adapted. The shell and fixing device of the magnetostrictive waveguide assembly are made of materials resistant to high temperature, high pressure and corrosion, to ensure the reliability of the device in harsh environment. The magnetostrictive waveguide assembly is installed at a specific position on the outer wall of the reaction kettle, which is calculated accurately to maximize the sensing of the magnetic field change caused by the liquid level change. The excitation and detection circuit system and the intelligent data processing unit are installed in a safe area away from the reaction kettle, and are connected with the magnetostrictive waveguide assembly through the optical fiber communication line, to improve the stability and anti-interference ability of signal transmission.

[0057] Measurement and control: In the chemical reaction process, the accurate control of liquid level is crucial for the safety of the reaction and the quality of the product. The liquid level measuring device of the invention monitors the change of liquid level in the reaction kettle in real time and transmits the liquid level data to the automatic control system of the reaction kettle. When the liquid level approaches the preset upper or lower limit value, the automatic control system automatically controls the start and stop of the feed pump and discharge pump according to the liquid level signal, ensuring that the liquid level always remains within a safe working range. At the same time, the intelligent data processing unit also analyzes the trend of liquid level change in real time, predicts the change of liquid level, and sends early warning information to the operator in advance, so as to adjust the reaction parameters in time and ensure the smooth progress of the reaction.

[0058] Fault diagnosis and maintenance: During the operation of the device, the intelligent data processing unit uses intelligent fault diagnosis and prediction function to monitor the working state of each part of the device in real time. Through the analysis of the measurement data, circuit parameters and device operation history data, potential hidden troubles are found in time.

Claims

1. A method of measuring the level of a liquid in an external magnetostrictive guided wave hermetic vessel, the method comprising: The method comprises the following steps: Step 1: A magnetostrictive waveguide assembly is installed outside the closed container, which comprises a magnetostrictive waveguide assembly, an excitation and detection circuit system, and an intelligent data processing unit. The magnetostrictive waveguide assembly is composed of a waveguide wire and a magnetic induction structure surrounding it. The magnetic induction structure is closely attached to the container wall. Step 2: The excitation and detection circuit system inputs a specific excitation current pulse to the waveguide wire, which generates a circumferential Ampere ring magnetic field around the waveguide wire. Step 3: When the liquid level in the container changes, the change in liquid level causes a change in the magnetic field distribution near the container wall. The magnetic induction structure senses this change in the magnetic field and transmits it to the waveguide wire. The Ampere ring magnetic field around the waveguide wire interacts with the magnetic field generated by the change in liquid level, causing the waveguide wire to generate a torsional wave pulse at the corresponding location. Step 4: The excitation and detection circuit system detects the propagation time of the torsional wave pulse and transmits the data to the intelligent data processing unit. Step 5: The intelligent data processing unit analyzes and calculates the propagation time using a liquid level calculation model based on multi-parameter fusion to obtain the liquid level height. The calculation formula of the liquid level calculation model based on multi-parameter fusion is H = f(A, W, V, T, S, M), where H is the liquid level height, A is the excitation current pulse amplitude, W is the excitation current pulse width, V is the torsional wave pulse propagation speed, T is the torsional wave pulse propagation time, S is the container cross-sectional area, and M is the container material-related coefficient. The function f is determined by machine learning algorithms and mathematical fitting methods. In Step 5, before performing liquid level calculation, the intelligent data processing unit first processes the received data using an adaptive noise suppression and signal enhancement model. The adaptive noise suppression and signal enhancement model is based on the adaptive least mean square error algorithm, which continuously adjusts the filter coefficients based on the statistical characteristics of the signal and noise to minimize the mean square error of the filter output signal.

2. The external magnetostrictive waveguide tank level measurement method of claim 1, wherein, The device comprises a magnetostrictive waveguide assembly, an excitation and detection circuit system, and an intelligent data processing unit. The magnetostrictive waveguide assembly is installed outside the closed container and is composed of a waveguide wire and a magnetic induction structure surrounding it. The magnetic induction structure is closely attached to the container wall. The excitation and detection circuit system is connected to the waveguide wire and is used to input an excitation current pulse to the waveguide wire and detect the propagation time of the torsional wave pulse. The intelligent data processing unit is connected to the excitation and detection circuit system and is used to receive data and calculate the liquid level height using a liquid level calculation model based on multi-parameter fusion.

3. A magnetostrictive guided wave closed vessel liquid level measuring device implementing the method of claim 1, characterized by The waveguide wire is made of a new type of magnetostrictive material with high magnetostrictive coefficient, low hysteresis loss, and good temperature stability.

4. The external magnetostrictive waveguide tank level measurement apparatus of claim 3, wherein, The magnetic induction structure is made of a soft magnetic material with high permeability and is designed to conform to the shape of the container wall.

5. The external magnetostrictive waveguide tank level measurement device of claim 3, wherein, The excitation and detection circuit system includes an excitation circuit and a detection circuit. The excitation circuit can generate an excitation current pulse with adjustable pulse amplitude, width, and frequency. The detection circuit uses high-sensitivity sensors and signal conditioning technology to accurately capture the torsional wave pulse signal and convert it into an electrical signal. The circuit system is equipped with shielding, filtering, and anti-interference measures.

6. The external magnetostrictive waveguide tank level measurement apparatus of claim 3, wherein, ​ 7. The external magnetostrictive waveguide tank level measurement device of claim 3, wherein, The intelligent data processing unit is based on a high-performance microprocessor and algorithm software, has data processing, analysis, storage and communication functions, and can interact with a host computer or other control systems.

8. The external magnetostrictive waveguide tank level measurement apparatus of claim 3, wherein, The magnetostrictive waveguide assembly is installed outside the container through special fixing devices, which can ensure reliable connection of the magnetostrictive waveguide assembly and the container wall and do not affect the normal operation and safety of the container.

9. The external magnetostrictive waveguide tank level measurement device of claim 3, wherein, The intelligent data processing unit also has a self-adaptive dynamic calibration mechanism, which can monitor the working state and measurement data changes in real time, and automatically start the self-adaptive dynamic calibration program to adjust the measurement parameters and algorithm model when the measurement error is detected to be out of the allowed range.

10. The external magnetostrictive waveguide tank level measurement apparatus of claim 3, wherein, The magnetostrictive waveguide device adopts a distributed measurement architecture, multiple magnetostrictive waveguide measurement nodes are arranged at different positions outside the container, each measurement node can independently measure the liquid level and transmit data to the intelligent data processing unit, and has a redundant backup function, when a measurement node fails, the system automatically switches to other normal nodes for measurement.

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