An electromagnetic ultrasonic guided wave-based storage tank liquid level height detection device and method

Abstract

The present invention provides a liquid level height detection device and method for a storage tank based on electromagnetic ultrasonic guided waves, which relates to the technical field of testing and metrology and non-destructive testing, and includes: a signal generation device generates a high-power pulse signal according to the attribute data of the liquid storage tank; an electromagnetic ultrasonic sensor uses the high-power pulse signal to excite ultrasonic guided waves at the bottom of the liquid storage tank, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, collects the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave, and converts the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal. A second signal processing device preprocesses the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determines the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, solving the technical problem that the applicability and detection accuracy of the existing liquid level height detection device for the storage tank are poor.

Description

Technical Field

[0001] The present invention relates to the technical field of test metrology and non-destructive testing, and in particular, to a device and method for detecting the liquid level height of a storage tank based on electromagnetic ultrasonic guided waves. Background Art

[0002] Lightweight storage oil tanks are an important part of oil and gas storage and transportation. The safe transportation of oil and gas is closely related to the measurement of their capacity and volume. Measuring the liquid level of storage tanks has become an important topic for evaluating the internal liquid volume. Currently, many detection methods such as the float method, magnetostrictive method, ultrasonic detection method, X-ray method, etc. have been widely used. However, the contradiction between the current liquid level measurement technology and market demand still exists. Considering the detection cost and accuracy issues, the proposal of new detection methods is of great significance for liquid level measurement.

[0003] Ultrasonic detection has developed rapidly in non-contact liquid level measurement due to its high detection accuracy, low cost, fast response, easy installation, and no damage to the test piece. As a type of ultrasonic excitation mode, ultrasonic guided waves can propagate over long distances in waveguide structures and are very suitable for long-distance detection and large-range detection in structures such as pipelines and liquid storage tanks.

[0004] There are mainly two ways to excite ultrasonic guided waves in lightweight oil storage tanks: piezoelectric ultrasonic technology and electromagnetic ultrasonic technology. Among them, piezoelectric ultrasonic detection, as one of the commonly used ultrasonic excitation methods, is often applied to liquid flow measurement. Its detection process is to use a piezoelectric sensor to achieve the excitation and reception of ultrasonic waves, and determine the liquid level by continuously changing the position of the piezoelectric ultrasonic sensor to obtain the amplitude of the echo signal at different positions. When using piezoelectric ultrasonic detection, a coupling agent is needed to ensure good contact between the sensor and the test piece, and there are also requirements for the surface finish of the test piece. It is greatly affected by temperature. At the same time, the presence of tiny impurities such as foam in the liquid level of the storage tank will also affect the piezoelectric ultrasonic detection results.

[0005] In view of the above problems, no effective solution has been proposed yet. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a device and method for detecting the liquid level height of a storage tank based on electromagnetic ultrasonic guided waves, so as to alleviate the technical problems of poor applicability and detection accuracy of the existing storage tank liquid level height detection device.

[0007] In a first aspect, an embodiment of the present invention provides a liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves, including: a signal generation device, a first signal processing device, an electromagnetic ultrasonic sensor, and a second signal processing device. Among them, the first signal processing device is respectively connected to the signal generation device, the electromagnetic ultrasonic sensor, and the second signal processing device, and the electromagnetic ultrasonic sensor is arranged at the bottom of the liquid storage tank; the signal generation device is used to generate a high-power pulse signal according to the attribute data of the liquid storage tank, and transmit the high-power pulse signal to the electromagnetic ultrasonic sensor through the first signal processing device, where the attribute data includes: size, wall thickness, and material density; the electromagnetic ultrasonic sensor is used to excite ultrasonic guided waves at the bottom of the liquid storage tank by using the high-power pulse signal, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, where the target path includes a first path and a second path;

[0008] The electromagnetic ultrasonic sensor is further used to collect a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path, convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal, and send the first voltage signal and the second voltage signal to the second signal processing device through the first signal processing device; the second signal processing device is used to respectively preprocess the first voltage signal and the second voltage signal to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing.

[0009] Further, the signal generation device includes: a function generator and a high-power pulse excitation system; the function generator is used to generate a pulse signal according to the attribute data of the liquid storage tank; the high-power pulse excitation system is used to amplify the pulse signal to obtain the high-power pulse signal.

[0010] Further, the first signal processing device includes: a duplexer and an impedance matching circuit.

[0011] Further, the electromagnetic ultrasonic sensor is composed of a flexible coil and soft iron.

[0012] Further, the second signal processing device includes: a power limiting module, a programmable gain amplifier module, a variable filter, an ADC data acquisition module, and an FPGA central controller. Among them, the power limiting module is used to perform power limiting processing on the first voltage signal and the second voltage signal respectively to obtain a first initial voltage signal and a second initial voltage signal; the programmable gain amplifier module is used to perform programmable gain amplification processing on the first initial voltage signal and the second initial voltage signal respectively to obtain a first intermediate voltage signal and a second intermediate voltage signal; the variable filter is used to perform filtering processing on the first intermediate voltage signal and the second intermediate voltage signal respectively to obtain a first target voltage signal and a second target voltage signal; the ADC data acquisition module is used to perform analog-to-digital conversion processing on the first target voltage signal and the second target voltage signal respectively to obtain the first digital signal and the second digital signal; the FPGA central controller is used to determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal.

[0013] Further, the first reflected ultrasonic guided wave includes: a first S0 mode ultrasonic guided wave and a first A0 mode ultrasonic guided wave, and the second reflected ultrasonic guided wave includes: a second S0 mode ultrasonic guided wave and a second A0 mode ultrasonic guided wave; the FPGA central controller is used to: determine first target data according to the first digital signal, where the first target data includes: the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determine second target data according to the second digital signal, where the second target data includes: the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determine the height of the liquid in the liquid storage tank based on the time-of-flight method, the first target data, the second target data, and the longitudinal wave sound speed of the ultrasonic guided wave in the liquid.

[0014] Further, the FPGA central controller is configured to: determine a first height of the liquid in the liquid storage tank based on the time-of-flight method, the first target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid; determine a second height of the liquid in the liquid storage tank based on the time-of-flight method, the second target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid; calculate a first product between the first height and the weight value corresponding to the first height, and calculate a second product between the second height and the weight value corresponding to the second height; and determine the average value of the first product and the second product as the height of the liquid in the liquid storage tank.

[0015] In a second aspect, an embodiment of the present invention further provides a method for detecting the liquid level height of a storage tank based on electromagnetic ultrasonic guided waves, including: generating a high-power pulse signal according to the attribute data of the liquid storage tank, and transmitting the high-power pulse signal to an electromagnetic ultrasonic sensor through a first signal processing device, where the attribute data includes: size, wall thickness, and material density; exciting an ultrasonic guided wave at the bottom of the liquid storage tank by using the electromagnetic ultrasonic sensor and the high-power pulse signal, so that the ultrasonic guided wave propagates in the liquid storage tank along a target path, where the target path includes a first path and a second path; collecting a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path by using the electromagnetic ultrasonic sensor, and converting the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal; respectively preprocessing the first voltage signal and the second voltage signal to obtain a first digital signal and a second digital signal, and determining the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing.

[0016] Further, the first reflected ultrasonic guided wave includes: a first S0 mode ultrasonic guided wave and a first A0 mode ultrasonic guided wave, and the second reflected ultrasonic guided wave includes: a second S0 mode ultrasonic guided wave and a second A0 mode ultrasonic guided wave; determining the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal includes: determining first target data according to the first digital signal, where the first target data includes: the propagation times of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, the propagation times of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determining second target data according to the second digital signal, where the second target data includes: the propagation times of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, the propagation times of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determining the height of the liquid in the liquid storage tank based on the transit time method, the first target data, the second target data, and the longitudinal wave sound speed of the ultrasonic guided wave in the liquid.

[0017] Further, determining the height of the liquid in the liquid storage tank based on the transit time method, the first target data, the second target data, and the longitudinal wave sound speed of the ultrasonic guided wave in the liquid includes: determining a first height of the liquid in the liquid storage tank based on the transit time method, the first target data, and the longitudinal wave sound speed of the ultrasonic guided wave in the liquid; determining a second height of the liquid in the liquid storage tank based on the transit time method, the second target data, and the longitudinal wave sound speed of the ultrasonic guided wave in the liquid; calculating a first product between the first height and the weight value corresponding to the first height, and calculating a second product between the second height and the weight value corresponding to the second height; determining the average value of the first product and the second product as the height of the liquid in the liquid storage tank.

[0018] In an embodiment of the present invention, a liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves is provided, including: the signal generation device, configured to generate a high-power pulse signal according to the attribute data of the liquid storage tank, and transmit the high-power pulse signal to the electromagnetic ultrasonic sensor through the first signal processing device, where the attribute data includes: size, wall thickness, and material density; the electromagnetic ultrasonic sensor, configured to use the high-power pulse signal to excite ultrasonic guided waves at the bottom of the liquid storage tank, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, where the target path includes a first path and a second path; the electromagnetic ultrasonic sensor is further configured to collect a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path, convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal, and transmit the first voltage signal and the second voltage signal to the second signal processing device through the first signal processing device; the second signal processing device is configured to perform preprocessing on the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmed gain amplification processing, filtering processing, and analog-to-digital conversion processing, achieving the purpose of detecting the liquid level of the storage tank using electromagnetic ultrasound, and further solving the technical problem of poor applicability and detection accuracy of the existing liquid storage tank liquid level height detection device, thereby realizing the technical effect of improving the applicability and detection accuracy of the liquid storage tank liquid level height detection device.

[0019] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are achieved and obtained by the structures specifically pointed out in the specification, claims, and drawings.

[0020] To make the above objectives, features, and advantages of the present invention more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, makes the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1Schematic diagram of a liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves provided by an embodiment of the present invention;

[0023] Figure 2 Schematic diagram of a target path provided by an embodiment of the present invention;

[0024] Figure 3 Another liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves provided by an embodiment of the present invention;

[0025] Figure 4 Flowchart of a method for detecting the liquid level height of a liquid storage tank based on electromagnetic ultrasonic guided waves provided by an embodiment of the present invention. Detailed implementation manners

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment 1:

[0028] According to an embodiment of the present invention, an embodiment of a liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves is provided. Figure 1 It is a schematic diagram of a liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves according to an embodiment of the present invention. As Figure 1 shown, the device includes: a signal generation device 10, a first signal processing device 20, an electromagnetic ultrasonic sensor 30, and a second signal processing device 40. Among them, the first signal processing device is respectively connected to the signal generation device, the electromagnetic ultrasonic sensor, and the second signal processing device, and the electromagnetic ultrasonic sensor is arranged at the bottom of the liquid storage tank;

[0029] The signal generation device is configured to generate a high-power pulse signal according to the attribute data of the liquid storage tank, and transmit the high-power pulse signal to the electromagnetic ultrasonic sensor through the first signal processing device, where the attribute data includes: size, wall thickness, and material density;

[0030] The electromagnetic ultrasonic sensor is configured to excite ultrasonic guided waves at the bottom of the liquid storage tank by using the high-power pulse signal, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, where the target path includes a first path and a second path;

[0031] It should be noted that, as Figure 2As shown, the ultrasonic guided wave propagates from the bottom of the storage tank into the liquid in the tank and continues to propagate in the liquid in the form of a body wave. At this time, the ultrasonic guided wave has two propagation paths (the two paths are symmetrically propagated left and right with the bottom normal as the axis of symmetry), which are divided into two propagation cases. Case 1 is that both propagation paths directly enter and propagate to the liquid surface and then reflect to the bottom of the tank; Case 2 is that one propagation path enters and propagates to the liquid surface and then reflects to the tank wall, and the other first enters and reaches the tank wall and then reflects to reach the liquid surface, and finally reflects to the bottom of the tank.

[0032] In addition, it should be noted that both the first path and the second path can be Figure 2 any one of Path 1 and Path 2 in

[0033] The electromagnetic ultrasonic sensor is also used to collect the first reflected ultrasonic guided wave corresponding to the first path and the second reflected ultrasonic guided wave corresponding to the second path, convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal, and send the first voltage signal and the second voltage signal to the second signal processing device through the first signal processing device;

[0034] The second signal processing device is used to preprocess the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing and analog-to-digital conversion processing.

[0035] In an embodiment of the present invention, a device for detecting the liquid level height of a storage tank based on electromagnetic ultrasonic guided waves is provided, including: the signal generating device, configured to generate a high-power pulse signal according to the attribute data of the liquid storage tank, and transmit the high-power pulse signal to the electromagnetic ultrasonic sensor through the first signal processing device, wherein the attribute data includes: size, wall thickness, and material density; the electromagnetic ultrasonic sensor, configured to excite ultrasonic guided waves at the bottom of the liquid storage tank by using the high-power pulse signal, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, wherein the target path includes a first path and a second path; the electromagnetic ultrasonic sensor is further configured to collect a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path, convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal, and transmit the first voltage signal and the second voltage signal to the second signal processing device through the first signal processing device; the second signal processing device is configured to preprocess the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, wherein the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing, achieving the purpose of detecting the liquid level of the storage tank by using electromagnetic ultrasound, and further solving the technical problems of poor applicability and detection accuracy of the existing device for detecting the liquid level height of the storage tank, thereby realizing the technical effect of improving the applicability and detection accuracy of the device for detecting the liquid level height of the storage tank.

[0036] In an embodiment of the present invention, as Figure 3 shown, the signal generating device 10 includes: a function generator 11 and a high-power pulse excitation system 12;

[0037] The function generator is configured to generate a pulse signal according to the attribute data of the liquid storage tank;

[0038] The high-power pulse excitation system is configured to amplify the pulse signal to obtain the high-power pulse signal.

[0039] The first signal processing device 20 includes: a duplexer 21 and an impedance matching circuit 22.

[0040] The electromagnetic ultrasonic sensor is composed of a flexible coil and soft iron.

[0041] The second signal processing device 40 includes: a power limit module 41, a programmable gain amplification module 42, a variable filter 43, an ADC data acquisition module 44, and an FPGA central controller 45.

[0042] The power limiting module is used to perform power limiting processing on the first voltage signal and the second voltage signal respectively to obtain a first initial voltage signal and a second initial voltage signal;

[0043] The programmable gain amplification module is used to perform programmable gain amplification processing on the first initial voltage signal and the second initial voltage signal respectively to obtain a first intermediate voltage signal and a second intermediate voltage signal;

[0044] The variable filter is used to perform filtering processing on the first intermediate voltage signal and the second intermediate voltage signal respectively to obtain a first target voltage signal and a second target voltage signal;

[0045] The ADC data acquisition module is used to perform analog-to-digital conversion processing on the first target voltage signal and the second target voltage signal respectively to obtain the first digital signal and the second digital signal;

[0046] The FPGA central controller is used to determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal.

[0047] The input end of the high-power pulse excitation device is connected to a function generator. The power limiting module is connected to the variable filter, the output end of the filter is connected to the input end of the programmable gain amplification module, the other end of the programmable gain amplification module is connected to the ADC data acquisition module, and the output end of the ADC data acquisition module is connected to the input end of the FPGA central controller.

[0048] Next, in conjunction with Figure 1 , Figure 2 and Figure 3 the working process of the above-mentioned liquid storage tank liquid level height detection device based on electromagnetic ultrasonic guided waves will be described.

[0049] An electromagnetic ultrasonic sensor is installed at a certain position of the storage tank. The sensor first excites ultrasonic guided waves at the bottom of the tank. At the bottom-liquid interface, the guided waves are converted into body waves and propagate in the storage tank liquid at a deflection angle θ. The ultrasonic waves propagate in the liquid and undergo specular reflection when they contact the liquid-air interface, return to the bottom of the tank, and the body waves are converted into guided waves at the bottom of the tank and then received by the electromagnetic ultrasonic transducer. At this time, the ultrasonic guided waves have two propagation paths (the two paths are symmetrically propagated left and right with the bottom surface normal as the symmetry axis). As shown in the figure, path 1 propagates incidentally to the liquid level and then reflects to the bottom of the tank, and path 2 first incidentally to the tank wall and then reflects to the liquid level, and finally reflects to the bottom of the tank. The two paths can realize the calculation of the liquid level height and can compensate each other. Taking path 1 as an example, the calculation process is as follows:

[0050] An electromagnetic ultrasonic sensor is installed at a certain position in the storage tank. First, the sensor excites ultrasonic guided waves at the bottom of the tank. At the bottom - liquid interface, the guided waves are converted into body waves and propagate in the storage tank liquid at a deflection angle θ. The ultrasonic waves propagate in the liquid and undergo specular reflection when they contact the liquid - air interface, then return to the bottom of the tank. The body waves are converted into guided waves at the bottom of the tank and then received by the electromagnetic ultrasonic transducer. At this time, the ultrasonic guided waves have two propagation paths (the two paths are symmetrically propagated left and right with the bottom normal as the symmetry axis). As shown in the figure, path 1 propagates incidentally to the liquid surface and then reflects to the bottom of the tank, and path 2 first incides on the tank wall and then reflects to the liquid surface, and finally reflects to the bottom of the tank. The two paths can be used to calculate the liquid level height and can compensate each other. Taking path 1 as an example, the calculation process is as follows:

[0051] First, obtain the group velocity dispersion curve based on the storage tank size, wall thickness, and material density, and obtain the wave structures in different modes. Then, select the excitation frequency according to the dispersion curve. It is necessary to ensure that the dispersion phenomenon is not serious at this excitation frequency.

[0052] According to the basic theory of the energy propagation of the coupled vibration of ultrasonic guided waves in solids and surface fluids, the electromagnetic ultrasonic sensor excites ultrasonic guided waves in the storage tank with a liquid level of h at a deflection angle θ, where, c f is the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid, and c p is the phase velocity of the ultrasonic wave in the solid.

[0053] The ultrasonic guided wave propagates in the liquid and undergoes specular reflection when it contacts the liquid - air interface and returns to the bottom of the tank. The propagation path in the liquid is L. The ultrasonic signal reflected to the bottom of the tank contains S0 and A0 modes and propagates to both sides at the bottom of the tank. Part of it returns to the electromagnetic ultrasonic sensor, and its path is x. According to Figure 2 , the geometric relationship is as follows:

[0054]

[0055] The electromagnetic ultrasonic sensor contains two signals. Calculate the time t for the S0 and A0 modes of the received ultrasonic guided wave to propagate the same distance 2(L + x) according to the time of appearance of the ultrasonic signal wave packet to t a l and t′ to tal. The S0 and A0 modes propagate a path of 2L in the liquid, and the propagation time is t fluid , the time taken for reflection to the tank wall and propagation to the sensor is tsolid and t′ solid , and the propagation distance is 2x. The relationship is as follows:

[0056]

[0057] According to the transit - time method, given the group velocities C of the S0 and A0 modesgs and C ga And the speed of ultrasound in liquid C f , the liquid level measurement by ultrasonic guided wave can be realized by combining the above formula with the following equations:

[0058]

[0059]

[0060] Using the above steps, the first height corresponding to the first path and the second height corresponding to the second path are calculated respectively. Finally, the first product between the first height and the weight value corresponding to the first height is calculated, and the second product between the second height and the weight value corresponding to the second height is calculated. The average value of the first product and the second product is determined as the height of the liquid in the liquid storage tank.

[0061] An embodiment of the present invention provides a tank liquid level measurement detection device based on electromagnetic ultrasonic guided wave technology, which can realize the effective measurement of the liquid level of the tank under complex environments (high temperature, low temperature, etc.), and improve the accuracy and robustness of the liquid level measurement through a dual-path compensation algorithm. When the detection device is working, a fixed-frequency pulse signal is passed into the flexible coil, and the generated eddy current field and the magnetic field generated by the soft iron work together to generate ultrasonic guided waves. The ultrasonic guided waves are converted into body waves at the solid-liquid interface and propagate symmetrically along two propagation paths, and finally return to the electromagnetic ultrasonic sensor and are received by the sensor. The signal received by the sensor is amplified and filtered to obtain a sensor receiving signal, and the calculations of the two signals compensate each other to improve the high-precision measurement of the liquid level.

[0062] Embodiment 2:

[0063] An embodiment of the present invention also provides a tank liquid level detection method based on electromagnetic ultrasonic guided waves. The above content provides a tank liquid level detection device based on electromagnetic ultrasonic guided waves for executing the tank liquid level detection method based on electromagnetic ultrasonic guided waves. The following is a specific introduction to the tank liquid level detection method based on electromagnetic ultrasonic guided waves provided by an embodiment of the present invention.

[0064] like Figure 4 As shown, Figure 4 is a schematic diagram of the above-mentioned tank liquid level detection method based on electromagnetic ultrasonic guided waves, the method comprising:

[0065] Step S102, generating a high-power pulse signal according to the attribute data of the liquid storage tank, and transmitting the high-power pulse signal to the electromagnetic ultrasonic sensor through a first signal processing device, wherein the attribute data includes: size, wall thickness and material density;

[0066] Step S104: Use the electromagnetic ultrasonic sensor and the high-power pulse signal to excite ultrasonic guided waves at the bottom of the liquid storage tank, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, where the target path includes a first path and a second path.

[0067] Step S106: Use the electromagnetic ultrasonic sensor to collect the first reflected ultrasonic guided wave corresponding to the first path and the second reflected ultrasonic guided wave corresponding to the second path, and convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal.

[0068] Step S108: Perform preprocessing on the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing.

[0069] In the embodiment of the present invention, a high-power pulse signal is generated according to the attribute data of the liquid storage tank, and the high-power pulse signal is transmitted to the electromagnetic ultrasonic sensor through the first signal processing device, where the attribute data includes: size, wall thickness, and material density; use the electromagnetic ultrasonic sensor and the high-power pulse signal to excite ultrasonic guided waves at the bottom of the liquid storage tank, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, where the target path includes a first path and a second path; use the electromagnetic ultrasonic sensor to collect the first reflected ultrasonic guided wave corresponding to the first path and the second reflected ultrasonic guided wave corresponding to the second path, and convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal; perform preprocessing on the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, where the preprocessing includes: power limit processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing, achieving the purpose of detecting the liquid level of the storage tank using electromagnetic ultrasound, and further solving the technical problem of poor applicability and detection accuracy of the existing liquid level height detection device for storage tanks, thereby realizing the technical effect of improving the applicability and detection accuracy of the liquid level height detection device for storage tanks.

[0070] Preferably, the first reflected ultrasonic guided wave includes: a first S0 mode ultrasonic guided wave and a first A0 mode ultrasonic guided wave, and the second reflected ultrasonic guided wave includes: a second S0 mode ultrasonic guided wave and a second A0 mode ultrasonic guided wave; determining the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal includes: determining first target data according to the first digital signal, where the first target data includes: the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determining second target data according to the second digital signal, where the second target data includes: the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; determining the height of the liquid in the liquid storage tank based on the transit time method, the first target data, the second target data, and the longitudinal wave speed of the ultrasonic guided wave in the liquid.

[0071] Preferably, determining the height of the liquid in the liquid storage tank based on the transit time method, the first target data, the second target data, and the longitudinal wave speed of the ultrasonic guided wave in the liquid includes:

[0072] Determining a first height of the liquid in the liquid storage tank based on the transit time method, the first target data, and the longitudinal wave speed of the ultrasonic guided wave in the liquid; determining a second height of the liquid in the liquid storage tank based on the transit time method, the second target data, and the longitudinal wave speed of the ultrasonic guided wave in the liquid; calculating a first product between the first height and a weight value corresponding to the first height, and calculating a second product between the second height and a weight value corresponding to the second height; determining the average value of the first product and the second product as the height of the liquid in the liquid storage tank.

[0073] In addition, in the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0074] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0075] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. The device embodiments described above are merely illustrative. For example, the division of the units is only a logical functional division, and there can be other division methods in actual implementation. For another example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed coupling or direct coupling or communication connection between each other can be through some communication interfaces. The indirect coupling or communication connection of the devices or units can be in an electrical, mechanical, or other form.

[0076] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0077] In addition, in each embodiment of the present invention, the functional units can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit.

[0078] Finally, it should be noted that the above-described embodiments are only specific embodiments of the present invention, used to illustrate the technical solutions of the present invention, rather than limiting it. The protection scope of the present invention is not limited thereto. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: any person skilled in the art within the technical scope disclosed by the present invention can still modify the technical solutions recorded in the foregoing embodiments or can easily think of changes, or perform equivalent replacements on some of the technical features; and these modifications, changes, or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention and should all be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for detecting the liquid level height of a storage tank based on electromagnetic ultrasonic guided waves, characterized in that Including: Generating a high-power pulse signal according to the attribute data of the liquid storage tank, and transmitting the high-power pulse signal to an electromagnetic ultrasonic sensor through a first signal processing device, where the attribute data includes: size, wall thickness, and material density; Exciting an ultrasonic guided wave at the bottom of the liquid storage tank by using the electromagnetic ultrasonic sensor and the high-power pulse signal, so that the ultrasonic guided wave propagates in the liquid storage tank along a target path, where the target path includes a first path and a second path; Collecting a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path by using the electromagnetic ultrasonic sensor, and converting the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal; Preprocessing the first voltage signal and the second voltage signal respectively to obtain a first digital signal and a second digital signal, and determining the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal; The first reflected ultrasonic guided wave includes: a first S0-mode ultrasonic guided wave and a first A0-mode ultrasonic guided wave, and the second reflected ultrasonic guided wave includes: a second S0-mode ultrasonic guided wave and a second A0-mode ultrasonic guided wave; Determining the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal includes: Determining first target data according to the first digital signal, where the first target data includes: the propagation time of the first S0-mode ultrasonic guided wave and the first A0-mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the first S0-mode ultrasonic guided wave and the first A0-mode ultrasonic guided wave at the bottom of the liquid storage tank; Determining second target data according to the second digital signal, where the second target data includes: the propagation time of the second S0-mode ultrasonic guided wave and the second A0-mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the second S0-mode ultrasonic guided wave and the second A0-mode ultrasonic guided wave at the bottom of the liquid storage tank; Determining the height of the liquid in the liquid storage tank based on the time-of-flight method, the first target data, the second target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid.

2. The method according to claim 1, characterized in that, Determining the height of the liquid in the liquid storage tank based on the time-of-flight method, the first target data, the second target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid includes: Determining a first height of the liquid in the liquid storage tank based on the time-of-flight method, the first target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid; Determining a second height of the liquid in the liquid storage tank based on the time-of-flight method, the second target data, and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid; Calculating a first product between the first height and a weight value corresponding to the first height, and calculating a second product between the second height and a weight value corresponding to the second height; Determining the average value of the first product and the second product as the height of the liquid in the liquid storage tank.

3. An electromagnetic ultrasonic guided wave tank liquid level height detection device for the electromagnetic ultrasonic guided wave tank liquid level height detection method according to any one of claims 1-2, characterized in that, Including: A signal generating device, a first signal processing device, an electromagnetic ultrasonic sensor, and a second signal processing device, wherein the first signal processing device is respectively connected to the signal generating device, the electromagnetic ultrasonic sensor, and the second signal processing device, and the electromagnetic ultrasonic sensor is disposed at the bottom of the liquid storage tank; The signal generating device is configured to generate a high-power pulse signal according to the attribute data of the liquid storage tank, and transmit the high-power pulse signal to the electromagnetic ultrasonic sensor through the first signal processing device, wherein the attribute data includes: size, wall thickness, and material density; The electromagnetic ultrasonic sensor is configured to excite ultrasonic guided waves at the bottom of the liquid storage tank by using the high-power pulse signal, so that the ultrasonic guided waves propagate in the liquid storage tank along a target path, wherein the target path includes a first path and a second path; The electromagnetic ultrasonic sensor is further configured to collect a first reflected ultrasonic guided wave corresponding to the first path and a second reflected ultrasonic guided wave corresponding to the second path, convert the first reflected ultrasonic guided wave and the second reflected ultrasonic guided wave into a first voltage signal and a second voltage signal, and transmit the first voltage signal and the second voltage signal to the second signal processing device through the first signal processing device; The second signal processing device is configured to respectively preprocess the first voltage signal and the second voltage signal to obtain a first digital signal and a second digital signal, and determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal, wherein the preprocessing includes: power limiting processing, programmable gain amplification processing, filtering processing, and analog-to-digital conversion processing.

4. The device according to claim 3, characterized in that, The signal generating device includes: a function generator and a high-power pulse excitation system; The function generator is configured to generate a pulse signal according to the attribute data of the liquid storage tank; The high-power pulse excitation system is configured to amplify the pulse signal to obtain the high-power pulse signal.

5. The device according to claim 3, characterized in that, The first signal processing device includes: a duplexer and an impedance matching circuit.

6. The device according to claim 3, wherein The electromagnetic ultrasonic sensor is composed of a flexible coil and soft iron.

7. The device according to claim 3, characterized in that, The second signal processing device includes: a power limiting module, a programmable gain amplification module, a variable filter, an ADC data acquisition module, and an FPGA central controller, wherein The power limiting module is configured to respectively perform power limiting processing on the first voltage signal and the second voltage signal to obtain a first initial voltage signal and a second initial voltage signal; The programmable gain amplification module is configured to respectively perform programmable gain amplification processing on the first initial voltage signal and the second initial voltage signal to obtain a first intermediate voltage signal and a second intermediate voltage signal; The variable filter is configured to respectively perform filtering processing on the first intermediate voltage signal and the second intermediate voltage signal to obtain a first target voltage signal and a second target voltage signal; The ADC data acquisition module is used to perform analog-to-digital conversion processing on the first target voltage signal and the second target voltage signal respectively, so as to obtain the first digital signal and the second digital signal; The FPGA central controller is used to determine the height of the liquid in the liquid storage tank based on the first digital signal and the second digital signal.

8. The device according to claim 7, characterized in that, The first reflected ultrasonic guided wave includes: a first S0 mode ultrasonic guided wave and a first A0 mode ultrasonic guided wave, and the second reflected ultrasonic guided wave includes: a second S0 mode ultrasonic guided wave and a second A0 mode ultrasonic guided wave; The FPGA central controller is used for: Determine first target data according to the first digital signal, wherein the first target data includes: the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the first S0 mode ultrasonic guided wave and the first A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; Determine second target data according to the second digital signal, wherein the second target data includes: the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave in the liquid in the liquid storage tank, and the propagation time of the second S0 mode ultrasonic guided wave and the second A0 mode ultrasonic guided wave at the bottom of the liquid storage tank; Based on the time-of-flight method, the first target data, the second target data and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid, determine the height of the liquid in the liquid storage tank.

9. The device according to claim 8, characterized in that, The FPGA central controller is used for: Based on the time-of-flight method, the first target data and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid, determine the first height of the liquid in the liquid storage tank; Based on the time-of-flight method, the second target data and the longitudinal wave sound velocity of the ultrasonic guided wave in the liquid, determine the second height of the liquid in the liquid storage tank; Calculate the first product between the first height and the weight value corresponding to the first height, and calculate the second product between the second height and the weight value corresponding to the second height; Determine the average value of the first product and the second product as the height of the liquid in the liquid storage tank.

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