High-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method

Abstract

The invention discloses a high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method, which belongs to the field of electromagnetic measurement and sensing, and adopts an embedded fusion sensing component and a uniform magnetic field generation component, and adopts a wide-spectrum alternating excitation mode. Conductive phase content and speed distribution measurement based on electrical characteristic parameters is completed respectively, and an embedded fusion sensing component and a uniform magnetic field generation component are excited respectively by using a high-frequency alternating-current signal and a low-frequency alternating-current signal on the premise that excitation of the two components does not interfere with each other. The embedded fusion sensing component receives the induced electromotive force signal and the motional electromotive force data at the same time, and high-precision measurement of the phase holdup and speed distribution of the conductive phase in the measurement area is achieved.

Description

Technical Field

[0001] The present invention belongs to the field of electromagnetic measurement and sensing, and specifically is a high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method. Background Art

[0002] The real-time and accurate measurement of multiphase flow process parameters is crucial to industrial links such as oil and gas exploration, transportation, metering and trade transfer. The traditional first-generation multiphase flow measurement technology mainly adopts the technical route of full separation and then single-phase metering. The technical means include physical sedimentation separation, manual metering and other methods. The main purpose is to concentrate the primary products at the wellhead in the separation workshop. The oil, gas and water with different density differences will gradually separate over time in the separator. The measurement device is large in size, high in consumables, non-real-time, and has large errors. Subsequently, the second and third generation multiphase flowmeters with Venturi throttle tubes and gamma ray sources as the main core components were developed. The difference is that the third generation technology further couples the electrical impedance measurement technology to obtain fluid velocity parameters. The second and third generation multiphase flowmeters have overcome the drawbacks of traditional measurement methods to a certain extent, and can realize online multiphase metering of single well output, but there are limitations in the measurement of total amount, homogeneity and average. As an intrusive measurement component, the Venturi throttle tube interferes with the multiphase flow field and brings pressure loss. Due to the complexity of the multiphase flow process, the technical route of measuring the relationship between pressure difference and total mass flow rate has a large uncertainty. Gamma radiation sources usually use single-energy or dual-energy tube diameter homogeneous average measurement methods, which are not applicable to complex laminar flows, slug flows, and annular flows. The velocity measurement method based on coupled impedance cross-correlation has high uncertainty due to the lack of continuous phase reference velocity, especially in multiphase flows with large fluctuations in each phase and anti-phase. At the same time, the use of gamma radioactive components increases the production, installation, and maintenance costs of the entire measuring instrument, as well as personnel and environmental safety hazards.

[0003] With the continuous upgrading of the national new quality productivity policy and the exponential growth of the global artificial intelligence industry, the important development trend of the global industry and manufacturing industry is to further complete the digital and intelligent transformation. The improvement of digitalization and intelligence in the petrochemical field can bring about cross-era changes in industrial production, transportation, storage, measurement and trade handover, and help realize the integrated operation of reservoir management and intelligent control, and the production management system of comprehensive perception, early warning prediction and analysis optimization, which greatly promotes the upgrading and transformation of my country's traditional energy industry, and provides a transformation foundation for the next form of "smart oil and gas fields". In this context, non-invasive, real-time online, and radiation-free electromagnetic measurement methods have begun to receive widespread attention, such as magnetic induction, capacitance, and resistance. These methods use the electrical characteristic contrast of each phase in the fluid to perform measurements, and researchers have also begun to use multimodal measurement methods to meet the needs of more measurement scenarios and improve the performance of the measurement system. For example, the capacitance method is used to measure the dielectric constant distribution, and the dual-plane resistance method is used for cross-correlation velocity measurement; the resistance method and the capacitance method are used to verify each other to determine the distribution of each phase in the mixed fluid; the capacitance method, resistance method, and ultrasound are used to perform multiple measurements on the measured area to improve the measurement accuracy; the magnetic induction method and the electromagnetic flow velocity measurement method are used to measure the content and velocity respectively, and then calculate the flow information; the magnetic induction method is used as a priori information for the capacitance method forward problem model study to improve its performance.

[0004] These multimodal measurement methods use multiple measurement systems to measure separately, or use the fusion of models, data and processing to improve the overall measurement effect, but do not achieve true sensor fusion. As a result, the measurement errors introduced by different measurement planes, different measurement points and different measurement times are accumulated during the front-end data measurement and collection, resulting in high uncertainty in the entire measurement process and inability to achieve accurate measurement. Summary of the invention

[0005] The present invention provides a high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method, which solves the problem of weak correlation between velocity distribution and phase content distribution and large overall measurement cumulative error in some prior arts due to different points, different planes and different times during measurement in front-end sensor deployment; solves the measurement error problem introduced by the lack of continuous phase reference velocity in the cross-correlation velocity measurement method; To achieve the above object, the present invention provides the following technical solutions: A multi-channel fusion sensing electromagnetic measurement method with high dynamic and wide spectrum alternating drive, including: Arrange uniform magnetic field generating components around the pipeline, and embed embedded fusion sensing components on the pipeline; The embedded fusion sensing component is stimulated by a high-frequency AC signal, the induced electromotive force phase change data is obtained based on the embedded fusion sensing component, and the phase content distribution of the fluid to be measured is obtained according to the induced electromotive force signal phase change data; The uniform magnetic field generating component is stimulated by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component, and the velocity distribution of the conductive fluid to be measured is obtained according to the motional electromotive force data; The flow rate data of the fluid to be measured is obtained according to the conductive phase velocity distribution and phase content distribution.

[0006] Preferably, the embedded fusion sensing component comprises electrodes and induction coils, and the embedded fusion sensing components are distributed at equal intervals around the pipeline.

[0007] Preferably, the induction coil is a wound coil or a flexible printed coil.

[0008] Preferably, the induction coil is embedded in a visible or non-visible area of ​​the pipe wall thickness and is not in contact with the fluid.

[0009] Preferably, the end surface of the electrode pointing to the area to be measured is in contact with the fluid to be measured.

[0010] Preferably, the embedded fusion sensing components are arranged alternately in a non-nested manner to form an enclosed array on the pipeline.

[0011] Preferably, the electrode material is a ferromagnetic material or a non-ferromagnetic material.

[0012] Preferably, when the electrode is made of ferromagnetic material, shielding measures are taken in the gap between the electrode and the induction coil.

[0013] Preferably, the embedded fusion sensing components are arranged in a nested manner to form an enclosed sensor array, and the centroids of the electrodes and the induction coils along the axial cross-section of the pipeline are on the same axis.

[0014] Preferably, the electrodes are of non-ferromagnetic material.

[0015] Preferably, the induced electromotive force is collected by an induction coil in the embedded fusion sensing component and transmitted to an external collection system through a low-impedance cable.

[0016] Preferably, the impedance of the cable measured by an impedance analyzer needs to satisfy a low impedance characteristic within the frequency range of high-frequency AC signals.

[0017] Preferably, the motional electromotive force is collected through the end surface of the electrode in the embedded fusion sensing component that contacts the fluid to be measured and transmitted to the external collection system through a low-impedance cable. Preferably, the impedance of the cable measured by an impedance analyzer needs to satisfy a low impedance characteristic within the frequency range of a low-frequency AC signal.

[0018] Preferably, the method for obtaining the phase content distribution of the fluid to be measured based on the phase change data of the induced electromotive force signal is specifically as follows: the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive phase fluid is utilized, an inversion method is adopted to obtain the conductivity distribution of the conductive phase fluid, and then a fluid model is established from the conductivity parameter imaging distribution to the conductive phase content distribution, thereby completing the conversion between the conductivity distribution and the phase content distribution.

[0019] Preferably, the uniform magnetic field generating component adopts a magnetic source including a Helmholtz coil and a permanent magnet.

[0020] Preferably, a Helmholtz coil is used as the magnetic source, and the coil on each side of the Helmholtz coil is composed of a plurality of sub-coils of different shapes and sizes, and the taps of the plurality of sub-coils are connected in sequence.

[0021] Preferably, the magnetic sources are arranged symmetrically in pairs along the axial direction of the pipeline.

[0022] Preferably, the magnetic source itself or the magnetic field generated by the excitation covers the entire cross-section of the area to be measured.

[0023] Preferably, the strength of the main magnetic field generated by the magnetic source itself or the excitation should be no less than 50 Gauss.

[0024] Preferably, the excitation current amplitudes of various components of the uniform magnetic field generating component are the same.

[0025] Preferably, the uniform magnetic field generating component is excited by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component. Specifically, a uniform magnetic field is obtained by positive excitation, and a motional electromotive force amplitude array is obtained under the uniform magnetic field distribution.

[0026] Preferably, the velocity distribution of the conductive fluid to be measured is obtained according to the motional electromotive force data as follows: In the forward excitation mode, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component are obtained, and the non-flow induction or orthogonal component in the measured potential data is compensated. Through the compensated motional electromotive force amplitude array, all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component are obtained according to the high-order imaging algorithm. Preferably, the uniform magnetic field generating component is excited by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component, specifically: reverse excitation obtains a non-uniform magnetic field distribution, and obtains a motional electromotive force amplitude array under the non-uniform magnetic field distribution.

[0027] Preferably, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the reverse excitation mode are obtained, the non-flow induction or orthogonal components in the measured potential data are compensated, and the axisymmetric conductive fluid velocity distribution is obtained according to the power-law imaging algorithm through the compensated motional electromotive force amplitude array, and then the conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution.

[0028] Preferably, obtaining the conductive fluid velocity distribution based on the axisymmetric conductive fluid velocity distribution is specifically as follows: randomly combining all possible non-axisymmetric velocity components and axisymmetric velocity distributions to obtain all possible conductive fluid velocity distributions, selecting the optimal solution through a weight function, and determining the conductive fluid velocity distribution.

[0029] Preferably, the fluid flow data is calculated by performing a matrix product of the velocity distribution and the phase content distribution and then taking the average according to the length of the time window.

[0030] Preferably, the fluid flow data is calculated by first averaging the matrix sets of velocity distribution and phase holdup matrix time window lengths and then performing product calculations.

[0031] Preferably, the length of the fluid flow data calculation time window is selected in frames, seconds or hours. Preferably, the frequency range of the high-frequency AC signal is 1Mhz-100Mhz.

[0032] Preferably, the frequency range of the low-frequency AC signal is 1-500 Hz.

[0033] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method, which adopts an embedded fusion sensing component and a uniform magnetic field generating component, and adopts a wide-spectrum alternating excitation method, using high-frequency AC signals and low-frequency AC signals to respectively excite the embedded fusion sensing component and the uniform magnetic field generating component under the premise that the excitations of the two components do not interfere with each other, and the embedded fusion sensing component simultaneously collects and receives the induced electromotive force signal and the motional electromotive force data, thereby realizing high-precision distribution measurement of the conductive phase velocity and the phase content in the measurement area. It solves the problem of some prior arts in the front-end sensor layout that the velocity distribution and the phase content distribution are not strongly correlated due to different points, different planes and different times during measurement, and the overall measurement cumulative error is large; it solves the measurement error problem introduced by the lack of a continuous phase reference velocity in the cross-correlation velocity measurement method; Further, the embedded fusion sensing component includes an electrode, a portion of which is embedded in the pipeline, and the electrode embedded in the pipeline contacts the fluid to receive the induced electromotive force signal; Furthermore, the induced electromotive force and the motional electromotive force are obtained through the electrodes and induction coils of the embedded fusion sensing component, which reduces the space occupied by the measuring device, helps to reduce costs and facilitates deployment.

[0034] Furthermore, the embedded fusion sensing components are evenly spaced around the pipe circumference, which enables measurement on the same pipe cross section, thus reducing measurement errors caused by different measurement time and measurement areas. Furthermore, the uniform magnetic field generating component adopts a magnetic source such as a Helmholtz coil or a permanent magnet. When the Helmholtz coil is used as the magnetic source, the coil on each side is composed of a plurality of sub-coils of different sizes, and the plurality of sub-coils are tapped and connected in sequence, thereby ensuring that the current direction is consistent during excitation and forming a stable and uniform magnetic field, thereby improving the magnetic field strength and uniformity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a flow chart of the multi-channel fusion sensing electromagnetic measurement method with high dynamic and wide spectrum alternating drive of the present invention; Figure 2 This is a schematic diagram of an embedded fusion sensing component according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the arrangement of embedded fusion sensing components according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the arrangement of uniform magnetic field generating components according to an embodiment of the present invention; Figure 5 This is a flow chart of obtaining induced electromotive force according to an embodiment of the present invention; Figure 6 This is another flow chart of obtaining induced electromotive force according to an embodiment of the present invention; Figure 7 A schematic diagram of a uniform magnetic field generated by low-frequency AC signal excitation according to an embodiment of the present invention; Figure 8 This is a schematic diagram of obtaining motional electromotive force according to an embodiment of the present invention.

[0036] Fig. 9 A diagram showing the relationship between the phase angle change of the induced voltage of a partially symmetrical induction coil and the water conductivity in an embodiment of the present invention; Fig.10 The relationship between the induced voltage phase angle change and water conductivity of the remaining groups of symmetrical induction coils in the embodiment of the present invention is shown in FIG. Fig.11 A primary magnetic field distribution diagram generated by the Helmholtz coil obtained by induction of the induction electrode after applying uniform magnetic field excitation in an embodiment of the present invention; Fig.12 The primary magnetic field distribution diagram generated by the Helmholtz coil obtained by the induction electrode after applying non-uniform magnetic field excitation in the embodiment of the present invention Fig.13This is a data set of induced potential difference under the primary magnetic field generated by the uniform Helmholtz coil in the embodiment of the present invention. Fig.14 This is a data set of induced potential difference under the primary magnetic field generated by the non-uniform Helmholtz coil according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0040] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below using an embodiment in which a pair of nested Helmholtz coils are used as a uniform magnetic field generating component for a magnetic source and an embedded fusion sensing component in a nested arrangement, in conjunction with the accompanying drawings.

[0041] This patent proposes a high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method, which is mainly used for measuring the flow rate of fluids in closed pipeline areas, such as oil and gas exploration, single wellhead metering, multiphase mixed transportation and trade handover. In this field, the components in the fluid are usually called phases. The technology proposed in this patent is applicable to single-phase or multi-phase mixed fluids.

[0042] In a multiphase system, the continuous phase refers to the phase that exists and surrounds or supports the dispersed phase (such as small droplets, bubbles and a small amount of solid particles) in most cases. The technology proposed in this patent can measure the phase content and flow rate distribution of each phase in the fluid in the pipeline when there is only one phase that is "continuously" conductive in the closed pipeline area to be measured, thereby obtaining the flow rate of the multiphase. The above-mentioned "continuous" conductive phase can be a phase with a conductivity of 0.5×10 -2 S / m to 10 7Liquid or solid particles between S / m. By distinguishing the "continuous" conductive phase and the "continuous" conductive phase with conductivity differences in the multiphase fluid, the conductivity distribution of the closed pipe section can be accurately measured.

[0043] Under the conditions described above, this patent proposes a high-dynamic, wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement technology.

[0044] First, the measurement objects studied in this patent are classified and named. The multiphase fluids targeted by this patent include solid, liquid and gas phases, which are represented by the prefixes L (Liquid), G (Gas) and S (Solid), respectively. The main flow and physical properties are divided into "continuous conductive phase" (Continuous Conductive Phase, CCP), "continuous conductive phase" (Non-Continuous Conductive Phase, NCCP) and non-continuous non-conductive phase (Non-Continuous Non-Conductive Phase, NCNCP). Without considering the conductive gas and ensuring the continuity of the conductive phase, the technology proposed in this patent targets a total of seven research objects, and typical examples are given: Conductive liquid phase continuous L-CCP: For example, electrolyte water in most cases exists and surrounds or supports the dispersed phase; Conductive liquid phase discontinuous L-NCCP: For example, electrolyte water exists as a dispersed phase; Non-conductive liquid phase discontinuous L-NCNCP: For example, small oil droplets exist as a dispersed phase; Non-conductive gas phase discontinuous G-NCNCP: For example, gas bubbles exist as a dispersed phase; Conductive solid continuous phase S-CCP: For example, metal particles mostly exist and surround or support the dispersed phase; Conductive solid discontinuous S-NCCP: For example, metal particles exist as a dispersed phase; Non-conductive solid discontinuous S-NCNCP: For example, wood chip particles exist as a dispersed phase.

[0045] From the definition of "continuous phase", it can be known that there can only be one of L-CCP and S-CCP, and thus the combination of mixed fluid types that can be measured by the technology proposed in this patent can be further obtained as shown in Table 1. It should be noted that when L-CCP and L-NCCP exist at the same time, it is necessary to consider whether the two will blend into a new L1-CCP.

[0046] Table 1 Combination of mixed fluid types

[0047] The high-dynamic, wide-spectrum alternating-driven, multi-channel fusion sensing electromagnetic measurement technology proposed in this patent mainly uses the electromagnetic induction principle to achieve the flow velocity and conductivity measurement of the fluid to be measured.

[0048] This patent adopts the principle of electromagnetic induction, and the corresponding control equation is:

[0049] in, H represents the magnetic field strength, σ Indicates the conductivity of the fluid to be measured, v Indicates the flow rate of the fluid to be measured, B is the magnetic field flux density generated by the Helmholtz coil, which is not affected by the flow state of the fluid to be measured. E’ represents the total electric field due to motion and induced electromagnetic forces, J s It is the excitation current source used to excite the induction coil.

[0050] like Figure 1 As shown, the embodiment of the present invention provides a high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method, comprising: S101 arranges uniform magnetic field generating components around the pipeline and embeds embedded fusion sensing components on the pipeline; S102 excites the embedded fusion sensing component through a high-frequency AC signal, obtains induced electromotive force phase change data based on the embedded fusion sensing component, and obtains the phase content distribution of the fluid to be measured according to the induced electromotive force signal phase change data; S103 excites the uniform magnetic field generating component through a low-frequency AC signal, obtains motional electromotive force data based on the embedded fusion sensing component, and obtains the velocity distribution of the conductive fluid to be measured according to the motional electromotive force data; S104 acquires flow rate data of the fluid to be measured according to the conductive phase velocity distribution and the phase content distribution.

[0051] The embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are evenly spaced and distributed around the pipeline.

[0052] In one embodiment of the present invention, the induction coil is a wound coil or a flexible printed coil.

[0053] In one embodiment of the present invention, the induction coil protrudes from the visible area of ​​the outer wall of the pipeline and does not contact the fluid.

[0054] In one embodiment of the present invention, the induction coil is embedded in the non-visible area of ​​the pipe wall thickness and does not contact the fluid.

[0055] In one embodiment of the present invention, the end surface of the electrode pointing to the area to be measured is in contact with the fluid to be measured.

[0056] In one embodiment of the present invention, the embedded fusion sensing components are arranged alternately in a non-nested manner to form an enclosed array on the pipeline. The electrode material is ferromagnetic material or non-ferromagnetic material. When the electrode is made of ferromagnetic material, shielding measures are taken in the gap between the electrode and the induction coil.

[0057] In one embodiment of the present invention, the embedded fusion sensing component is arranged in a nested manner to form an enclosed sensor array, the centroid of the electrode and the induction coil along the axial section of the pipeline are on the same axis, and the electrode is a non-ferromagnetic material.

[0058] In one embodiment of the present invention, the induced electromotive force is collected by the induction coil in the embedded fusion sensing component and transmitted to the external collection system through a low-impedance cable. The impedance of the cable measured by an impedance analyzer must meet the low impedance characteristics within the frequency range of the high-frequency AC signal.

[0059] In one embodiment of the present invention, the motional electromotive force is collected through the end face where the electrode in the embedded fusion sensing component contacts the fluid to be measured and transmitted to an external collection system through a low-impedance cable. The impedance of the cable measured by an impedance analyzer must meet the low-impedance characteristics within the frequency range of the low-frequency AC signal.

[0060] In one embodiment of the present invention, the method for obtaining the phase content distribution of the fluid to be measured based on the phase change data of the induced electromotive force signal is specifically as follows: the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive phase fluid is utilized, and the conductivity distribution of the conductive phase fluid is obtained by adopting an inversion method, and then a fluid model from the conductivity parameter imaging distribution to the conductive phase content distribution is established to complete the conversion of the conductivity distribution and the phase content distribution.

[0061] In one embodiment of the present invention, the uniform magnetic field generating component adopts a magnetic source including a Helmholtz coil and a permanent magnet. The Helmholtz coil is used as the magnetic source, and the coil on each side of the Helmholtz coil is composed of a plurality of sub-coils of different shapes and sizes, and the taps of the plurality of sub-coils are connected in sequence. The magnetic source needs to be symmetrically arranged in pairs along the axial direction of the pipeline. The magnetic field generated by the magnetic source itself or the excitation covers the entire cross-section of the area to be measured. The intensity of the main magnetic field generated by the magnetic source itself or the excitation should be no less than 50 Gauss, and the excitation current amplitudes of the components of the uniform magnetic field generating component are the same.

[0062] In one embodiment of the present invention, the uniform magnetic field generating component is excited by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component. Specifically, a uniform magnetic field is obtained by positive excitation, and a motional electromotive force amplitude array is obtained under the uniform magnetic field distribution. The velocity distribution of the conductive fluid to be measured is obtained according to the motional electromotive force data. Specifically, In the forward excitation mode, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component are obtained, and the non-flow induction or orthogonal component in the measured potential data is compensated. Through the compensated motional electromotive force amplitude array, all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component are obtained according to the high-order imaging algorithm. In one embodiment of the present invention, the uniform magnetic field generating component is excited by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component. Specifically, a non-uniform magnetic field distribution is obtained by reverse excitation, and a motional electromotive force amplitude array is obtained under the non-uniform magnetic field distribution.

[0063] The characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the reverse excitation mode are obtained, and the non-flow induction or orthogonal components in the measured potential data are compensated. The axisymmetric conductive fluid velocity distribution is obtained according to the power-law imaging algorithm through the compensated motional electromotive force amplitude array, and then the conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution.

[0064] The conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution as follows: all possible non-axisymmetric velocity components and axisymmetric velocity distributions are randomly combined to obtain all possible conductive fluid velocity distributions, the optimal solution is selected through a weight function, and the conductive fluid velocity distribution is determined.

[0065] In one embodiment of the present invention, the fluid flow data is calculated by performing a matrix product of velocity distribution and phase content distribution and then averaging the matrix according to the length of the time window.

[0066] The length of the time window for fluid flow data calculation is selected in terms of frames, seconds, and hours.

[0067] In one embodiment of the present invention, the fluid flow data is calculated by first averaging the matrix set of velocity distribution and phase holdup matrix time window length and then performing product calculation.

[0068] The length of the fluid flow data calculation time window is selected in frames, seconds and hours In one embodiment of the present invention, the measured fluid flow data is presented in the form of an image or a data set, wherein the image distinguishes different phases and phase velocities by color type and chromaticity, and the data set has a clear identifier indicating the data type.

[0069] In one embodiment of the present invention, the frequency range of the high-frequency AC signal is 1Mhz-100Mhz, and the frequency range of the low-frequency AC signal is 1-500Hz.

[0070] In one embodiment of the present invention, a multi-channel fusion sensing electromagnetic measurement method with high dynamic wide spectrum alternating drive is provided, comprising: 1.1 Arrange the uniform magnetic field generating components around the pipeline and embed the embedded fusion sensing components into the pipeline; 1.2 The embedded fusion sensing component is stimulated by a high-frequency AC signal, the induced electromotive force phase change data is obtained based on the embedded fusion sensing component, and the phase content distribution of the fluid to be measured is obtained according to the induced electromotive force signal phase change data; 1.2.1 According to claim 1.2, the conductivity distribution of the conductive phase fluid is obtained by using the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive phase fluid, and adopting the inversion method; 1.2.2 According to claim 1.2, a fluid model is established from the conductivity parameter imaging distribution to the conductive phase content distribution, and the conversion between the conductivity distribution and the phase content distribution is completed; 1.3 According to claim 1, the uniform magnetic field generating component is excited by a low-frequency AC signal, the motional electromotive force data is obtained based on the embedded fusion sensing component, and the velocity distribution of the conductive fluid to be measured is obtained based on the motional electromotive force data; 1.3.1 According to claim 1.3, a uniform magnetic field is obtained by positive excitation, and an array of motional electromotive force amplitudes is obtained under the magnetic field distribution. 1.3.1.1 According to claim 1.3.1, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the forward excitation mode are obtained to compensate for the non-flow induction (or orthogonal) component in the measured potential data; 1.3.1.2 According to claim 1.3.1, by using the compensated motional electromotive force amplitude array, all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component are obtained according to the high-order imaging algorithm 1.3.2 According to claim 1.3, reverse excitation obtains a non-uniform magnetic field distribution, and obtains a motional electromotive force amplitude array under the non-uniform magnetic field distribution 1.3.2.1 According to claim 1.3.2, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the reverse excitation mode are obtained to compensate for the non-flow induction (or orthogonal) component in the measured potential data; 1.3.2.2 According to claim 1.3.2, the velocity distribution of the axisymmetric conductive fluid is obtained by using the compensated motional electromotive force amplitude array according to the power law imaging algorithm 1.3.3 All possible velocity distributions of the conductive fluid can be obtained by randomly combining all possible non-axisymmetric velocity components and axisymmetric velocity distributions. The optimal solution can be selected through the weight function to determine the most practical conductive fluid velocity distribution.

[0071] 1.3.4 According to the requirements of claim 1.3, the excitation current amplitudes of the components of the uniform magnetic field generating unit must be the same; 1.4 Obtain the flow data of the fluid to be measured based on the conductive phase velocity distribution and phase content distribution.

[0072] 1.4.1 According to claim 1.4, the fluid flow data can be calculated by matrix product of velocity distribution and phase content distribution and then averaged according to the time window length. 1.4.2 According to claim 1.4, the fluid flow data can be calculated by averaging the matrix set of velocity distribution and phase content matrix time window length and then multiplying them. 1.4.3 According to claim 1.4, the length of the time window for calculating fluid flow data can be selected according to actual needs such as frames, seconds, hours, etc. 1.4.4 According to claim 1.4, the data may be presented in the form of an image or a data set, wherein the image distinguishes different phases and phase velocities by color type and chromaticity, and the data set has a clear identifier indicating the data type; 2. The embedded fusion sensing components include electrodes and induction coils, and the embedded fusion sensing components are evenly spaced and distributed around the pipeline; 2.1 The induction coil can be a wound coil or a flexible printed form; 2.2 The induction coil may protrude from the visible area of ​​the outer wall of the pipe but not be in contact with the fluid; 2.3 The induction coil can be embedded in the non-visible area of ​​the pipe wall thickness, but not in contact with the fluid; 2.4 The end surface of the electrode pointing to the area to be tested must be in contact with the fluid to be tested; 2.5 When using nested layout to form an enclosed sensor array, it is necessary to ensure that the centroids of the two along the axial section of the pipeline are on the same axis; 2.5.1 When the electrodes and induction coils are arranged in a nested manner to form an enclosed sensor array, it is necessary to ensure that the centroids of the two along the axial section of the pipeline are on the same axis, characterized in that the electrodes must be made of non-ferromagnetic materials; 2.6 Use non-nested alternating deployment to form an encircling array; 2.6.1 The electrodes and induction coils are arranged alternately in a non-nested manner to form an enclosed array, and the electrode material may be a ferromagnetic material or a non-ferromagnetic material; 2.6.2. The electrodes and induction coils are arranged alternately in a non-nested manner to form an enclosed array. When ferromagnetic materials are used, shielding measures must be taken in the gap between the two.

[0073] 3. The uniform magnetic field generating component adopts a magnetic source including but not limited to a Helmholtz coil and a permanent magnet.

[0074] 3.1. If the Helmholtz coil is used as the magnetic source, the coil on each side is composed of multiple sub-coils of different shapes and sizes, and the taps of the multiple sub-coils are connected in sequence.

[0075] 3.2 The magnetic sources need to be placed symmetrically in pairs along the axial direction of the pipeline; 3.3 The main magnetic field generated by the magnetic source itself or the excitation should cover the cross section of the area to be measured; 3.4 The strength of the main magnetic field generated by the magnetic source itself or the excitation should not be less than 50 Gauss; 4. The frequency range of high-frequency AC signal is 1Mhz-100Mhz.

[0076] 5. The frequency range of low frequency AC signal is 1-500Hz. 6. The induced electromotive force is collected by the induction coil in the embedded fusion sensing component and transmitted to the external collection system through a low-impedance cable.

[0077] 6.1 The impedance of the cable measured by an impedance analyzer must meet the low impedance characteristics within the frequency range of high-frequency AC signals.

[0078] 7. The motional electromotive force is collected through the end surface where the electrode in the embedded fusion sensing component contacts the fluid to be measured and transmitted to the external collection system through a low-impedance cable. 7.1 The impedance of the cable measured by an impedance analyzer must meet the low impedance characteristics within the frequency range of low-frequency AC signals.

[0079] Another embodiment of the present invention provides a multi-channel fusion sensing electromagnetic measurement method with high dynamic wide spectrum alternating drive, wherein the embedded fusion sensing component is specifically: Under the support of electromagnetic induction principle, this patent designs an embedded fusion sensing component composed of an induction coil and an electrode, which serves as the front-end output component and input component of the entire electromagnetic fusion measurement system for generating and receiving electromagnetic signals. The schematic diagram of a single embedded fusion sensing component embodiment is shown in FIG. Figure 2 As shown; select a material with good conductivity as the electrode, and the electrode contact surface is embedded in the closed test pipe. This part contacts the fluid to be tested and receives the induced electromotive force signal. The rear end is embedded in the pipe to fix the electrode and seal it. The tail end protrudes from the periphery of the pipe to facilitate the placement of the induction coil; select a conductive cable as the induction coil material, fix it to the tail of the electrode in a certain form, and place it at equal intervals around the closed pipe to form a sensor array, as shown Figure 3 shown.

[0080] The uniform magnetic field generating components are specifically: This patent uses a Helmholtz coil as the magnetic source in the uniform magnetic field generating component, which serves as a low-frequency excitation component in the electromagnetic fusion measurement system; Figure 4This is a design drawing of the Helmholtz coil. This patented peripheral sensor uses a Helmholtz coil made of conductive cables. Each side of the coil is composed of several sub-coils of different sizes (number ≥ 1). The coil taps are connected in sequence to ensure that the current direction is consistent during excitation and form a stable and uniform magnetic field, thereby improving the magnetic field strength and uniformity.

[0081] The specific steps of the measurement method are: The conductivity measurement method proposed in this patent is based on the laws of electromagnetic induction and eddy current induced in an AC magnetic field. The coil is excited in turn by a high-frequency AC signal to generate a primary magnetic field in the area to be measured. When the conductive fluid is in the area to be measured, a secondary magnetic field is generated due to the eddy current effect. The phase of the induced electromotive force signal on the embedded fusion sensing component will change accordingly, and the amplitude of the change is related to the conductivity of the conductive fluid. The process is as follows: Figure 5 , 6 As shown. By receiving the phase change of the signal through the embedded fusion sensing component, the fluid conductivity of the closed pipe section to be measured at that moment is obtained, and the conductivity distribution is further obtained by array signal processing, thereby obtaining the phase content distribution of the fluid to be measured and expressing it through numerical values ​​or images.

[0082] The flow velocity measurement uses a low-frequency AC signal to excite the uniform magnetic field generating component to generate a main magnetic field located in the measured area. When the conductive fluid flows through the measured area, it will cut the primary magnetic field lines of force to generate an induced electric field. At this time, the embedded fusion sensing component will generate an induced electromotive force, that is, a motional electromotive force, the magnitude of which depends on the strength of the induced electric field and corresponds to the flow velocity of the measured fluid in the measured area. The process is as follows: Figure 7 ,8. By sensing the change of the potential difference of the embedded fusion sensing component, the flow velocity of the fluid in the closed pipe area to be measured is obtained, and the flow velocity distribution of the fluid to be measured is obtained, which is also expressed by numerical values ​​and images.

[0083] An embodiment of the present invention provides a high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method, The schematic diagram of the electromagnetic fusion measurement system for velocity and conductivity measurement is shown in Figure 4.

[0084] The inner diameter of the simulation test pipeline is 50mm, the outer diameter is 55mm, and the wall thickness is 5mm. 16 fusion sensor arrays are evenly distributed in the pipeline cross-section. The electrode sensor is made of SS316 stainless steel, the contact part diameter is 6mm, and the length is 18mm. The induction coil is wound with copper wire with a wire diameter of 3mm, 4 turns, and a coil excitation current of 0.5A. The Helmholtz coil has 10 layers, 20 turns per layer, and a spacing of 170mm between two sets of coils. The copper wire diameter is 0.8mm, and the excitation current is 2.5A.

[0085] The electromagnetic fusion measurement system uses 10Mhz high-frequency AC signal and 20Hz low-frequency AC signal as excitation signals. The feasibility of the electromagnetic fusion measurement system in flow velocity and conductivity measurement is verified through simulation experiments.

[0086] 1) The simulation experiment is arranged as follows: 1. Build an electromagnetic fusion measurement system according to simulation parameters; 2. Use a 10Mhz signal to rotate and excite a single coil to generate a primary magnetic field, and record the initial value of the magnetic field in the pipeline area to be tested; 3. Add conductive fluid into the pipeline and record the changes in induced electromotive force at different positions before and after the magnetic field is superimposed; 4. Change the conductivity of the conductive fluid, draw the relationship curve between conductivity and induced electromotive force change, and verify the feasibility of conductivity measurement; 5. Use 20Hz low-frequency AC signal to positively and reversely excite the Helmholtz coil to generate uniform and non-uniform main magnetic fields, verify the uniformity of the magnetic field in empty pipe and full water conditions, and record the initial value of the magnetic field in the pipeline area to be tested; 6. Record the induced potential data set generated by the conductive fluid cutting the magnetic induction line at the array electrode sensor to verify the feasibility of flow velocity measurement.

[0087] The remaining coils are used as induction coils. When the conductive fluid flows through the area to be measured, a secondary magnetic field is generated due to the eddy current effect. The changes in the induced electromotive force at different positions before and after the magnetic field superposition are measured. The electrode part in the fusion sensor measures the motional electromotive force generated when the conductive fluid flows through the primary magnetic field. 2) Conductivity measurement method verification: The basic principle of the conductivity measurement system is to excite the induction coils in sequence and observe the change in magnetic induction intensity generated when the conductive working medium passes through the excitation magnetic field. The induced voltage phase angle of the receiving coil changes linearly with the conductivity of the working medium being measured. By analyzing the phase angle change, the conductivity distribution of the working medium can be obtained. According to the coil number shown in Figure 3, the excitation coil is determined to be No. 1, and the relationship between the induced voltage phase angle change and the water conductivity of each group of symmetrical induction coils is plotted, as shown in Figures 9 and Fig.10 shown.

[0088] from Fig. 9 and Fig.10 It can be seen that under the excitation of coil No. 1, the relationship curve between the phase angle change of the symmetrical induction coil voltage and the water conductivity is consistent, and the overall relationship is a positive proportional function. As the distance between the induction coil and the excitation coil gradually increases, the original magnetic field generated by the excitation coil gradually weakens, and the slope of the influence curve of the induced voltage in the induction coil gradually increases; as the conductivity of water increases, the change in magnetic induction intensity caused by the mass flow to be measured passing through the magnetic field gradually increases, and the voltage phase angle change gradually increases; The experimental results show that the integrated flow measurement system components do not affect the performance of the conductivity measurement system, and the system can normally measure the conductivity of the area to be measured. The conductivity measurement system can normally measure the conductivity changes in the area to be measured.

[0089] 3) Flow rate measurement method verification The basic principle of the flow velocity measurement system is to calculate the flow velocity through the induced electric field E generated by the conductive fluid flowing through the primary magnetic field B. Therefore, the magnetic field characteristics of the primary magnetic field B determine the performance of the measurement system. The important indicators that characterize the magnetic field characteristics generally use the average magnetic flux density Bavg and the magnetic field uniformity Bhom. Bhom is the ratio of the standard deviation of the magnetic field flux to the average value of the average magnetic field flux density in the domain: Where n is the number of cells in the region, Bi is the average value of the magnetic field in each small cell n, and Bavg is the average value of the magnetic flux density in the entire region. It is a dimensionless parameter. The smaller the value of Bhom, the more uniform the magnetic field in the region.

[0090] Fig.11 This is the primary magnetic field distribution diagram generated by the Helmholtz coil obtained by induction of the induction electrode after applying uniform magnetic field excitation. It can be seen that this magnetic field distribution ensures the magnetic field uniformity in the central area of ​​the pipeline to a certain extent.

[0091] Fig.12 The primary magnetic field distribution diagram generated by the Helmholtz coil after the induction electrode is induced by the non-uniform magnetic field excitation On this basis, the simulation considers empty pipes and full water pipes, and the average magnetic flux density B avg And the magnetic field uniformity Bhom is calculated. For an empty pipe, the average magnetic flux density B in the pipe cross section avg 73.9150G, uniformity index B hom When the pipe is filled with water, the average magnetic flux density B in the pipe cross section avg 73.914G, uniformity index B hom It is 0.0015345, which meets the measurement system requirements, that is, a uniform magnetic field can be obtained in the pipeline when the Helmholtz coil is excited in the same direction.

[0092] If the water flow rate is 5m / s, the conductive fluid cuts the magnetic induction line to generate an induced potential, and the induced potential array can be measured at the array electrode sensor. Taking the induced potential of the fifth electrode as a reference, the induced potential difference data set under uniform and non-uniform magnetic fields can be obtained, such as Fig.13 and Fig.14 shown.

[0093] It is observed that the induced potential difference data set under uniform magnetic field is symmetrically distributed on both sides with the ninth electrode as the center, which is consistent with the induced potential measurement law of the flow velocity measurement system. The induced potential difference data set under non-uniform magnetic field presents a sinusoidal distribution and undergoes two cycles of changes, which is consistent with the anti-Helmholtz magnetic field characteristics.

[0094] The influence of the induction coil on the flow velocity measurement system is almost negligible, and the flow velocity measurement system can maintain the measurement performance while integrating the conductivity measurement system components.

[0095] Through simulation experiments, it is verified that the average magnetic flux density of the electromagnetic fusion system proposed in this paper is 73.9150G (empty pipe) and 73.914G (full water) when measuring flow velocity; the magnetic field uniformity is 0.00153 (empty pipe) and 0.0015345 (full water), and the induced potential difference under the uniform magnetic field conforms to the induced potential measurement law of the flow velocity measurement system; when measuring conductivity, the induced voltage phase angle-conductivity change is linearly related, and the electromagnetic sensor fusion does not affect the performance of the flow velocity and conductivity measurement parts, providing a new idea of ​​electromagnetic fusion measurement for the field of multiphase flow measurement.

[0096] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, a person skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method, characterized in that: include: Arrange uniform magnetic field generating components around the pipeline, and embed embedded fusion sensing components on the pipeline; The embedded fusion sensing component is stimulated by a high-frequency AC signal, the induced electromotive force phase change data is obtained based on the embedded fusion sensing component, and the phase content distribution of the fluid to be measured is obtained according to the induced electromotive force signal phase change data; The uniform magnetic field generating component is stimulated by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component, and the velocity distribution of the conductive fluid to be measured is obtained according to the motional electromotive force data; The flow rate data of the fluid to be measured is obtained according to the conductive phase velocity distribution and phase content distribution.

2. According to the high-dynamic wide-spectrum alternatingly driven multi-channel fusion sensing electromagnetic measurement method of claim 1, the embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are evenly spaced and distributed around the pipeline.

3. According to the high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method of claim 2, the induction coil is a wound coil or a flexible printed coil.

4. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 2 is characterized in that: The induction coil is embedded in the visible or non-visible area of ​​the pipe wall and does not come into contact with the fluid.

5. According to the high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method of claim 2, the end surface of the electrode pointing to the area to be measured is in contact with the fluid to be measured.

6. According to the high-dynamic wide-spectrum alternatingly driven multi-channel fusion sensing electromagnetic measurement method of claim 2, the embedded fusion sensing components are arranged alternately in a non-nested manner to form an enclosed array on the pipeline.

7. According to the high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method of claim 6, the electrode material is a ferromagnetic material or a non-ferromagnetic material.

8. According to the high-dynamic wide-spectrum alternating-driven multi-channel fusion sensing electromagnetic measurement method of claim 7, when the electrodes are made of ferromagnetic materials, shielding measures are taken in the gap between the electrodes and the induction coils.

9. According to the high-dynamic wide-spectrum alternatingly driven multi-channel fusion sensing electromagnetic measurement method of claim 2, the embedded fusion sensing components are nestedly arranged to form an enclosed sensor array, and the centroids of the electrodes and the induction coils along the axial section of the pipeline are on the same axis.

10. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 9 is characterized in that , the electrodes are made of non-ferromagnetic materials.

11. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 2, characterized in that: The induced electromotive force is collected by the induction coil in the embedded fusion sensing component and transmitted to the external collection system through a low-impedance cable.

12. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 11, characterized in that: The impedance of the cable measured by an impedance analyzer must meet the low impedance characteristics within the frequency range of high-frequency AC signals.

13. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 2, characterized in that: The motional electromotive force is collected through the end surface where the electrode in the embedded fusion sensing component contacts the fluid to be measured and transmitted to the external collection system through a low-impedance cable.

14. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 2, characterized in that: The impedance of the cable measured by an impedance analyzer must meet the low impedance characteristics within the frequency range of low-frequency AC signals.

15. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The method for obtaining the phase content distribution of the fluid to be measured based on the phase change data of the induced electromotive force signal is specifically as follows: the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive phase fluid is utilized, and the conductivity distribution of the conductive phase fluid is obtained by adopting the inversion method, and then a fluid model from the conductivity parameter imaging distribution to the conductive phase content distribution is established to complete the conversion of the conductivity distribution and the phase content distribution.

16. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The uniform magnetic field generating component adopts a magnetic source including a Helmholtz coil or a permanent magnet.

17. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 16, characterized in that: When a Helmholtz coil is used as a magnetic source, the coil on each side of the Helmholtz coil is composed of a plurality of sub-coils of different shapes and sizes, and the taps of the plurality of sub-coils are connected in sequence.

18. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 16, characterized in that: The magnetic sources need to be arranged symmetrically in pairs along the axial direction of the pipeline.

19. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 16, characterized in that: The magnetic field generated by the magnetic source itself or the excitation covers the entire cross-section of the area to be measured.

20. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 16, characterized in that: The strength of the main magnetic field generated by the magnetic source itself or the excitation should be no less than 50 Gauss.

21. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 16, characterized in that: The excitation current amplitudes of various components of the uniform magnetic field generating component are the same.

22. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The uniform magnetic field generating component is stimulated by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component. Specifically, a uniform magnetic field is obtained by positive excitation, and the motional electromotive force amplitude array is obtained under the uniform magnetic field distribution.

23. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 22, characterized in that: The velocity distribution of the conductive fluid to be measured is obtained according to the motional electromotive force data: In the forward excitation mode, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component are obtained to compensate for the non-flow induced or orthogonal components in the measured potential data. Through the compensated motional electromotive force amplitude array, all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component are obtained according to the high-order imaging algorithm.

24. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The uniform magnetic field generating component is stimulated by a low-frequency AC signal, and the motional electromotive force data is obtained based on the embedded fusion sensing component. Specifically, the non-uniform magnetic field distribution is obtained by reverse excitation, and the motional electromotive force amplitude array is obtained under the non-uniform magnetic field distribution.

25. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 24, characterized in that: The characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the reverse excitation mode are obtained, and the non-flow induction or orthogonal components in the measured potential data are compensated. The axisymmetric conductive fluid velocity distribution is obtained according to the power-law imaging algorithm through the compensated motional electromotive force amplitude array, and then the conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution.

26. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 24, characterized in that: The conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution as follows: all possible non-axisymmetric velocity components and axisymmetric velocity distributions are randomly combined to obtain all possible conductive fluid velocity distributions, the optimal solution is selected through a weight function, and the conductive fluid velocity distribution is determined.

27. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The fluid flow data is calculated by matrix multiplication of velocity distribution and phase holdup distribution and then averaging according to the length of the time window.

28. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The fluid flow data is calculated by averaging the matrix sets of velocity distribution and phase holdup matrix time window lengths and then multiplying them.

29. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 27 or 28, characterized in that: The length of the time window for fluid flow data calculation is selected in frames, seconds or hours.

30. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The frequency range of high frequency AC signal is 1Mhz-100Mhz.

31. The high dynamic wide spectrum alternating driven multi-channel fusion sensing electromagnetic measurement method according to claim 1, characterized in that: The frequency range of the low frequency AC signal is 1-500Hz.

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