Multi-channel Fusion Sensing Electromagnetic Measurement Method with High-Dynamic Wide-Spectrum Alternating Drive

Abstract

The present invention discloses a multi-channel fusion perception electromagnetic measurement method with high dynamic wide-spectrum alternating drive, belonging to the field of electromagnetic measurement and sensing. An embedded fusion perception component and a uniform magnetic field generation component are adopted, and in the way of wide-spectrum alternating excitation, the measurement of the conductive phase content rate and velocity distribution based on electrical characteristic parameters is respectively completed. The embedded fusion perception component and the uniform magnetic field generation component are respectively excited by using high-frequency alternating signals and low-frequency alternating signals on the premise that the excitations of the two components do not interfere with each other. The embedded fusion perception component simultaneously receives the induced electromotive force signal and the motional electromotive force data, realizing the high-precision measurement of the conductive phase content rate and velocity distribution in the measurement area.

Description

Technical Field

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

[0002] The real-time and accurate measurement of multiphase flow process parameters is crucial for industrial processes such as oil and gas exploration, transportation, metering, and trade handover. 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, etc. The primary wellhead products are mainly concentrated in the separation workshop. Oil, gas, and water with different density differences will gradually separate in the separator over time. Its measuring device has a large volume, high consumables, is non-real-time, and has large errors. Subsequently, the second-generation and third-generation multiphase flowmeters with Venturi throttle tubes and gamma-ray sources as the main core components were developed. The difference lies in that the impedance measurement technology is further coupled in the third-generation technology to obtain the fluid velocity parameter. The second- and third-generation multiphase flowmeters have overcome the drawbacks of traditional measurement means to a certain extent and can realize on-line multiphase metering of single-well output, but there are limitations in the measurement of total quantity, homogeneity, and average. As an invasive measurement component, the Venturi throttle tube interferes with the multiphase flow field and causes pressure loss. Due to the complex multiphase flow process, the uncertainty of the technical route measured by the relationship between pressure difference and total mass flow is relatively large. Gamma radiation sources usually adopt the single-energy or dual-energy pipe diameter homogeneous average measurement method, which is not applicable to complex laminar flow, slug flow, and circulation flow, etc. The velocity measurement method based on the coupling of impedance cross-correlation has high uncertainty due to the lack of a continuous-phase reference velocity, especially in multiphase flows with large fluctuations in each phase and in-phase reversal. At the same time, the use of gamma radioactive components increases the costs of the entire metering instrument in production, installation, and maintenance, as well as the potential safety hazards for personnel and the environment.

[0003] Under the background of 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 is to further complete the digital and intelligent transformation. The improvement of digitalization and intelligentization in the petrochemical field can bring epoch-making changes to industrial production, transportation and storage, metering, and trade handover, etc., contribute to the integrated operation of reservoir management and intelligent control, and a production management system of comprehensive perception, early warning prediction, and analysis and optimization, greatly promoting the upgrading and transformation of China's traditional energy industry, and providing a transformation basis for the next form of "intelligent oil and gas field". Under this background, non-invasive, real-time online, and non-radiative electromagnetic measurement methods have begun to receive extensive attention, such as magnetic induction method, capacitance method, resistance method, etc. These methods use the electrical characteristic contrast of each phase in the fluid for measurement, and researchers have also begun to use multi-modal measurement methods to meet the needs of more measurement scenarios and improve the performance of the measurement system, such as using the capacitance method to measure the dielectric constant distribution and then using the dual-plane resistance method for cross-correlation flow velocity measurement; using the resistance method and capacitance method to verify each other to determine the phase distribution in the mixed fluid; using technologies such as capacitance method, resistance method, and ultrasound to measure the area to be measured multiple times to improve the measurement accuracy; using the magnetic induction method and electromagnetic flow velocity measurement method to measure the holdup and flow velocity respectively and then calculate the flow rate information; using the magnetic induction method as prior information for the forward problem model research of the capacitance method to improve its performance.

[0004] These multi-modal measurement methods improve the overall measurement effect by separate measurements of multiple measurement systems or through the fusion of models, data, and processing, and do not achieve true sensor fusion. Therefore, the measurement errors introduced at different measurement planes, different measurement points, and different measurement times during the front-end data measurement and acquisition accumulate, resulting in a relatively high uncertainty in the entire measurement process and unable to achieve precise measurement. Summary of the Invention

[0005] The present invention provides a multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive, which solves the problems in some existing technologies that the correlation between velocity distribution and phase holdup distribution is not strong due to different positions, different planes, and different times during measurement in the front-end sensor layout, and the overall measurement cumulative error is relatively large; it solves the measurement error problem caused by the lack of a continuous-phase reference velocity in the cross-correlation velocity measurement method;

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive, comprising:

[0008] Arrange a uniform magnetic field generating component around the pipeline, and embed an embedded fusion perception component on the pipeline;

[0009] The embedded fusion sensing component is excited by a high-frequency alternating current signal, phase change data of the induced electromotive force is obtained based on the embedded fusion sensing component, and the phase fraction distribution of the fluid to be measured is obtained according to the phase change data of the induced electromotive force signal;

[0010] The uniform magnetic field generating component is excited by a low-frequency alternating current signal, 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;

[0011] The flow rate data of the fluid to be measured is obtained according to the velocity distribution of the conductive phase and the phase fraction distribution.

[0012] Preferably, the embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are distributed at equal intervals in the circumferential direction of the pipeline.

[0013] Preferably, the induction coil adopts a wound coil or a flexible printed coil.

[0014] Preferably, the induction coil is embedded in the visible or non-visible area of the pipeline wall thickness and does not contact the fluid.

[0015] Preferably, the end face of the electrode pointing to the area to be measured contacts the fluid to be measured.

[0016] Preferably, the embedded fusion sensing components are arranged in a non-nested and alternating manner to form an enclosed array on the pipeline.

[0017] Preferably, the electrode material is a ferromagnetic material or a non-ferromagnetic material.

[0018] Preferably, when the electrode adopts a ferromagnetic material, a shielding measure is taken in the placement gap between the electrode and the induction coil.

[0019] 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.

[0020] Preferably, the electrode is a non-ferromagnetic material.

[0021] Preferably, the induced electromotive force is collected by the induction coil in the embedded fusion sensing component and transmitted to the external acquisition system through a low-impedance cable.

[0022] Preferably, the impedance measured by the cable through the impedance analyzer needs to meet the low-impedance characteristic within the frequency range of the high-frequency alternating current signal.

[0023] Preferably, the motional electromotive force is collected by the end face of the electrode in the embedded fusion sensing component that contacts the fluid to be measured and transmitted to the external acquisition system through a low-impedance cable.

[0024] Preferably, the impedance of the cable measured by an impedance analyzer should satisfy the low-impedance characteristic within the low-frequency AC signal frequency range.

[0025] Preferably, the method for obtaining the phase fraction distribution of the fluid to be measured according to the phase change data of the induced electromotive force signal is specifically as follows: By using the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive-phase fluid, the conductivity distribution of the conductive-phase fluid is obtained by an inversion method, and then a fluid model from the conductivity parameter imaging distribution to the phase fraction distribution of the conductive phase is established to complete the conversion between the conductivity distribution and the phase fraction distribution.

[0026] Preferably, the uniform magnetic field generating component uses a magnetic source including a Helmholtz coil and a permanent magnet.

[0027] Preferably, if a Helmholtz coil is used as the magnetic source, each side coil of the Helmholtz coil is composed of multiple sub-coils with different shapes and sizes, and the multiple sub-coil taps are connected in sequence.

[0028] Preferably, the magnetic sources should be arranged symmetrically in pairs along the axial direction of the pipeline.

[0029] Preferably, the magnetic field generated by the magnetic source itself or by excitation covers the entire cross-section of the area to be measured.

[0030] Preferably, the intensity of the main magnetic field generated by the magnetic source itself or by excitation should be not less than 50 Gauss.

[0031] Preferably, the amplitude of the excitation current of each component of the uniform magnetic field generating component is the same.

[0032] Preferably, by exciting the uniform magnetic field generating component with a low-frequency AC signal, the method for obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a uniform magnetic field by forward excitation, and obtain an array of motional electromotive force amplitudes under the uniform magnetic field distribution.

[0033] Preferably, the method for obtaining the velocity distribution of the conductive fluid to be measured according to the motional electromotive force data is specifically as follows:

[0034] Under the condition of obtaining the forward excitation mode, obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component, compensate for the non-flow induction or orthogonal component in the measured potential data, and obtain all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component according to the compensated motional electromotive force amplitude array by a high-order imaging algorithm.

[0035] Preferably, by exciting the uniform magnetic field generating component with a low-frequency AC signal, the method for obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a non-uniform magnetic field distribution by reverse excitation, and obtain an array of motional electromotive force amplitudes under the non-uniform magnetic field distribution.

[0036] Preferably, under the reverse excitation mode, the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component are obtained, the non-flow induction or orthogonal component in the measured potential data is compensated, and based on the compensated motional electromotive force amplitude array, the axisymmetric conductive fluid velocity distribution is obtained according to the power-law imaging algorithm, and then the conductive fluid velocity distribution is obtained based on the axisymmetric conductive fluid velocity distribution.

[0037] Preferably, obtaining the conductive fluid velocity distribution based on the axisymmetric conductive fluid velocity distribution specifically includes: randomly combining all possible non-axisymmetric velocity components and axisymmetric flow velocity distributions to obtain all possible conductive fluid velocity distributions, and selecting the optimal solution through a weight function to determine the conductive fluid velocity distribution.

[0038] Preferably, the fluid flow rate data calculation method is calculated by taking the average of the matrix product of the velocity distribution and the phase holdup distribution according to the time window length.

[0039] Preferably, the fluid flow rate data calculation method is calculated by first taking the average of the matrix sets of the velocity distribution and the phase holdup matrix time window length and then multiplying.

[0040] Preferably, the time window length of the fluid flow rate data calculation is selected according to frames, seconds or hours.

[0041] Preferably, the frequency range of the high-frequency alternating current signal is 1 MHz - 100 MHz.

[0042] Preferably, the frequency range of the low-frequency alternating current signal is 1 - 500 Hz.

[0043] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a multi-channel fusion perception electromagnetic measurement method with high dynamic and wide spectrum alternating drive, which adopts an embedded fusion perception component and a uniform magnetic field generating component, and uses a wide-spectrum alternating excitation method. Under the premise that the high-frequency alternating current signal and the low-frequency alternating current signal do not interfere with each other in the excitation of the two components, the embedded fusion perception component and the uniform magnetic field generating component are respectively excited. The embedded fusion perception component simultaneously collects and receives the induced electromotive force signal and the motional electromotive force data, realizing high-precision distribution measurement of the conductive phase flow velocity and the phase holdup in the measurement area. It solves the problems in some prior arts that the correlation between the velocity distribution and the phase holdup distribution is not strong due to different positions, different planes and different times during measurement at the front-end sensor layout, resulting in a large overall measurement cumulative error; it solves the measurement error problem caused by the lack of a continuous phase reference velocity in the cross-correlation velocity measurement method.

[0044] Further, the embedded fusion perception component includes electrodes, a part of the electrodes is embedded in the pipeline, the electrodes embedded in the pipeline are in contact with the fluid, and receive the induced electromotive force signal.

[0045] Furthermore, the induced electromotive force and motional electromotive force are obtained through the electrodes and induction coils of the embedded fusion sensing component, reducing the space occupation of the measuring device, which is beneficial to cost reduction and facilitates placement.

[0046] Furthermore, the embedded fusion sensing components are evenly distributed in the circumferential direction of the pipeline, enabling measurement on the same pipeline cross-section and reducing measurement errors caused by different measurement times and measurement areas.

[0047] Furthermore, the uniform magnetic field generating component uses magnetic sources such as Helmholtz coils or permanent magnets. When using Helmholtz coils as the magnetic source, each side of the coil consists of multiple sub-coils of different sizes. The multiple sub-coils are tapped and connected in sequence, ensuring that the current directions are consistent during excitation and forming a stable and uniform magnetic field, thereby improving the magnetic field intensity and uniformity. Brief Description of the Drawings

[0048] Figure 1 It is a flowchart of the multi-channel fusion sensing electromagnetic measurement method with high dynamic wide-spectrum alternating drive of the present invention;

[0049] Figure 2 It is a schematic diagram of the embedded fusion sensing component of the embodiment of the present invention;

[0050] Figure 3 It is a schematic diagram of the layout of the embedded fusion sensing component of the embodiment of the present invention;

[0051] Figure 4 It is a schematic diagram of the layout of the uniform magnetic field generating component of the embodiment of the present invention;

[0052] Figure 5 It is a flowchart of obtaining the induced electromotive force of the embodiment of the present invention;

[0053] Figure 6 It is a flowchart of obtaining another induced electromotive force of the embodiment of the present invention;

[0054] Figure 7 It is a schematic diagram of generating a uniform magnetic field by low-frequency alternating signal excitation of the embodiment of the present invention;

[0055] Figure 8 It is a schematic diagram of obtaining the motional electromotive force of the embodiment of the present invention.

[0056] Figure 9 It is a graph showing the relationship between the change in the induction voltage phase angle of the partially grouped symmetric induction coils and the water conductivity of the embodiment of the present invention;

[0057] Figure 10 It is a graph showing the relationship between the change in the induction voltage phase angle of the remaining grouped symmetric induction coils and the water conductivity of the embodiment of the present invention

[0058] Figure 11The distribution diagram of the primary magnetic field generated by the Helmholtz coil induced by the induction electrode after applying a uniform magnetic field excitation in the embodiment of the present invention;

[0059] Figure 12 The distribution diagram of the primary magnetic field generated by the Helmholtz coil induced by the induction electrode after applying a non-uniform magnetic field excitation in the embodiment of the present invention

[0060] Figure 13 The data set of the induced potential difference under the primary magnetic field generated by the uniform Helmholtz coil in the embodiment of the present invention

[0061] Figure 14 The data set of the induced potential difference under the primary magnetic field generated by the non-uniform Helmholtz coil in the embodiment of the present invention. Detailed implementation manners

[0062] To make the objectives, 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 with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components of the embodiments of the present invention described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0063] 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 claimed present invention, but merely represents selected 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.

[0064] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0065] To enable those skilled in the art to better understand the technical solutions of the present invention, an embodiment in the case of a uniform magnetic field generating component using a pair of nested Helmholtz coils as the magnetic source and an embedded fusion sensing component in a nested layout form will be further described in detail with reference to the accompanying drawings.

[0066] This patent proposes a multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive, which is mainly used for measuring the flow rate of fluids in a closed pipeline area, such as in oil and gas exploration, single-well wellhead metering, multiphase mixing transportation, and trade handover. In the field, the components in the fluid are usually called phases, and the technology proposed in this patent is applicable to single-phase or multiphase mixed fluids.

[0067] In a multiphase system, the continuous phase refers to the phase that exists in most cases and surrounds or supports the dispersed phase (such as small liquid droplets, bubbles, and a small amount of solid particles). The technology proposed in this patent can measure the phase holdup and flow velocity distribution of each phase in the fluid within the closed pipeline area to be measured when there is exactly one "continuous" conductive phase in the fluid. Thus, the flow rate of the multiphase can be obtained. The above-mentioned "continuous" conductive phase can be a liquid or solid particle with a conductivity between 0.5×10 -2 S / m and 10 7 S / m. By distinguishing the "continuous" conductive phase and the non-"continuous" conductive phase with different conductivities in the multiphase fluid, the conductivity distribution of the closed pipeline cross-section can be accurately measured.

[0068] Under the above-mentioned conditions, this patent proposes a multi-channel fusion perception electromagnetic measurement technology with high dynamic wide-spectrum alternating drive.

[0069] First, classify and name the measurement objects studied in this patent. The existing forms of the multiphase fluid targeted by this patent cover the three states of solid phase, liquid phase, and gas phase, which are represented by the prefixes L (Liquid), G (Gas), and S (Solid) respectively. The main flow and physical characteristics are divided into "continuous conductive phase" (CCP), "non-continuous conductive phase" (NCCP), and non-continuous non-conductive phase (NCNCP). Without considering conductive gases and ensuring the continuity of the conductive phase, there are a total of seven research objects targeted by the technology proposed in this patent, and typical examples are given:

[0070] Continuous conductive liquid phase L-CCP: For example, electrolyte water exists and surrounds or supports the dispersed phase in most cases;

[0071] Non-continuous conductive liquid phase L-NCCP: For example, electrolyte water exists as the dispersed phase;

[0072] Non-continuous non-conductive liquid phase L-NCNCP: For example, small oil droplets exist as the dispersed phase;

[0073] Non-continuous non-conductive gas phase G-NCNCP: For example, bubbles exist as the dispersed phase;

[0074] Continuous conductive solid phase S-CCP: For example, metal particles exist and surround or support the dispersed phase in most cases;

[0075] Non-continuous conductive solid phase S-NCCP: For example, metal particles exist as the dispersed phase;

[0076] Non-conductive solid-phase discontinuous S-NCNCP: For example, wood chip particles exist as the dispersed phase.

[0077] From the definition of "continuous phase", it can be known that only one of L-CCP and S-CCP can exist. Further, the combination of types of mixed fluids measurable by the technology proposed in this patent is shown in Table 1. It should be noted that when L-CCP and L-NCCP exist simultaneously, it is necessary to consider whether they will merge into a new L1-CCP.

[0078] Table 1 Combination of types of mixed fluids

[0079]

[0080] The multi-channel fusion perception electromagnetic measurement technology with high-dynamic wide-spectrum alternating drive proposed in this patent mainly uses the principle of electromagnetic induction to measure the flow velocity and conductivity of the fluid to be measured.

[0081] This patent uses the principle of electromagnetic induction, and its corresponding control equation is:

[0082]

[0083] Among them, H represents the magnetic field strength, σ represents the conductivity of the fluid to be measured, v represents the flow velocity of the fluid to be measured, B is the magnetic flux density of the magnetic field 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 caused by the moving and induced electromagnetic forces, J s is the excitation current source used to excite the induction coil.

[0084] As Figure 1 shown, the embodiment of the present invention provides a multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive, including:

[0085] S101 Arrange the uniform magnetic field generating component around the pipeline, and embed the embedded fusion perception component on the pipeline;

[0086] S102 Excite the embedded fusion perception component through a high-frequency alternating current signal, obtain the phase change data of the induced electromotive force based on the embedded fusion perception component, and obtain the phase fraction distribution of the fluid to be measured according to the phase change data of the induced electromotive force signal;

[0087] S103 Excite the uniform magnetic field generating component through a low-frequency alternating current signal, obtain the motional electromotive force data based on the embedded fusion perception component, and obtain the velocity distribution of the conductive fluid to be measured according to the motional electromotive force data;

[0088] S104 obtains the flow rate data of the fluid to be measured according to the conductive phase velocity distribution and the phase content rate distribution.

[0089] The embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are evenly distributed in the circumferential direction of the pipeline.

[0090] In an embodiment of the present invention, the induction coil adopts a wound coil or a flexible printed coil.

[0091] In an 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.

[0092] In an embodiment of the present invention, the induction coil is embedded in the non-visible area of the pipeline wall thickness and does not contact the fluid.

[0093] In an embodiment of the present invention, the end face of the electrode pointing to the area to be measured contacts the fluid to be measured.

[0094] In an embodiment of the present invention, the embedded fusion sensing components are arranged in a non-nested and alternating manner to form an enclosed array on the pipeline. The electrode material is ferromagnetic material or non-ferromagnetic material. When the electrode adopts ferromagnetic material, shielding measures are taken in the gap between the electrode and the induction coil.

[0095] In an embodiment of the present invention, the embedded fusion sensing components are arranged in a nested manner to form an enclosed sensor array. The centroids of the electrodes and the induction coils along the axial section of the pipeline are on the same axis, and the electrodes are non-ferromagnetic materials.

[0096] In an 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 acquisition system through a low-impedance cable. The impedance measured by the cable through the impedance analyzer needs to meet the low-impedance characteristics within the high-frequency alternating current signal frequency range.

[0097] In an embodiment of the present invention, the motional electromotive force is collected by the end face where the electrode in the embedded fusion sensing component contacts the fluid to be measured and transmitted to the external acquisition system through a low-impedance cable. The impedance measured by the cable through the impedance analyzer needs to meet the low-impedance characteristics within the low-frequency alternating current signal frequency range.

[0098] In an embodiment of the present invention, the method for obtaining the phase content rate distribution of the fluid to be measured according to the phase change data of the induced electromotive force signal is specifically as follows: using the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive phase fluid, the conductivity distribution of the conductive phase fluid is obtained by using the inversion method, and then a fluid model from the conductivity parameter imaging distribution to the phase content rate distribution of the conductive phase is established to complete the conversion between the conductivity distribution and the phase content rate distribution.

[0099] In an embodiment of the present invention, the uniform magnetic field generating component uses a magnetic source including Helmholtz coils and permanent magnets. When using Helmholtz coils as the magnetic source, each side coil of the Helmholtz coils is composed of multiple sub-coils with different shapes and sizes. The multiple sub-coils are connected in series by taps. The magnetic sources need to be arranged symmetrically in pairs along the axial direction of the pipeline. The magnetic field generated by the magnetic source itself or through 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 through excitation should be not less than 50 Gauss, and the amplitude of the excitation current of each component of the uniform magnetic field generating component is the same.

[0100] In an embodiment of the present invention, the uniform magnetic field generating component is excited by a low-frequency alternating current signal, and obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a uniform magnetic field through forward excitation, and obtain an array of motional electromotive force amplitudes under the uniform magnetic field distribution. Obtaining the velocity distribution of the conductive fluid to be measured based on the motional electromotive force data is specifically as follows:

[0101] Under the forward excitation mode, obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component, compensate for the non-flow induction or orthogonal component in the measured potential data. Through the compensated array of motional electromotive force amplitudes, obtain all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component according to the high-order imaging algorithm.

[0102] In an embodiment of the present invention, the uniform magnetic field generating component is excited by a low-frequency alternating current signal, and obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a non-uniform magnetic field distribution through reverse excitation, and obtain an array of motional electromotive force amplitudes under the non-uniform magnetic field distribution.

[0103] Under the reverse excitation mode, obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component, compensate for the non-flow induction or orthogonal component in the measured potential data. Through the compensated array of motional electromotive force amplitudes, obtain the velocity distribution of the axisymmetric conductive fluid according to the power-law imaging algorithm, and then obtain the velocity distribution of the conductive fluid based on the velocity distribution of the axisymmetric conductive fluid.

[0104] Obtaining the velocity distribution of the conductive fluid based on the velocity distribution of the axisymmetric conductive fluid is specifically as follows: Randomly combine all possible non-axisymmetric velocity components and the axisymmetric flow velocity distribution to obtain all possible velocity distributions of the conductive fluid, and select the optimal solution through the weight function to determine the velocity distribution of the conductive fluid.

[0105] In an embodiment of the present invention, the calculation method of the fluid flow rate data is calculated by taking the matrix product of the velocity distribution and the phase content rate distribution and then taking the average according to the time window length.

[0106] The time window length for calculating the fluid flow rate data is selected according to frames, seconds, and hours.

[0107] In an embodiment of the present invention, the fluid flow rate data calculation method is to calculate the product after taking the average of the matrix sets of the velocity distribution and the time window length of the phase fraction matrix.

[0108] The time window length for calculating the fluid flow rate data is selected according to frames, seconds, and hours.

[0109] In an embodiment of the present invention, the presentation form of the fluid flow rate data to be measured is an image or a data set, where different phases and phase velocities are distinguished in the image by color types and chromaticities, and the data set has a clear identifier indicating the data type.

[0110] In an embodiment of the present invention, the frequency range of the high-frequency alternating current signal is 1 MHz - 100 MHz, and the frequency range of the low-frequency alternating current signal is 1 - 500 Hz.

[0111] In an embodiment of the present invention, a multi-channel fusion perception electromagnetic measurement method with high dynamic wide-spectrum alternating drive is provided, including:

[0112] 1.1 Arrange the uniform magnetic field generating component around the pipeline, and embed the embedded fusion perception component on the pipeline;

[0113] 1.2 Excite the embedded fusion perception component with a high-frequency alternating current signal, obtain the phase change data of the induced electromotive force based on the embedded fusion perception component, and obtain the phase fraction distribution of the fluid to be measured according to the phase change data of the induced electromotive force signal;

[0114] 1.2.1 According to 1.2, utilize the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive-phase fluid, and adopt an inversion method to obtain the conductivity distribution of the conductive-phase fluid;

[0115] 1.2.2 According to 1.2, establish a fluid model from the conductivity parameter imaging distribution to the conductive-phase fraction distribution to complete the conversion between the conductivity distribution and the phase fraction distribution;

[0116] 1.3 Excite the uniform magnetic field generating component with a low-frequency alternating current signal, obtain the motional electromotive force data based on the embedded fusion perception component, and obtain the velocity distribution of the conductive fluid to be measured according to the motional electromotive force data;

[0117] 1.3.1 According to 1.3, obtain a uniform magnetic field by forward excitation, and obtain the motional electromotive force amplitude array under the magnetic field distribution.

[0118] 1.3.1.1 According to 1.3.1, obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the forward excitation mode, and compensate the non-flow induction (or orthogonal) component in the measured potential data;

[0119] 1.3.1.2 According to what is described in 1.3.1, all possible velocity distributions of the non-axisymmetric conducting fluid and the average velocity of the axisymmetric component are obtained according to the high-order imaging algorithm through the compensated array of the magnitudes of motional electromotive forces.

[0120] 1.3.2 According to what is described in 1.3, a non-uniform magnetic field distribution is obtained by reverse excitation, and an array of the magnitudes of motional electromotive forces is obtained under the non-uniform magnetic field distribution.

[0121] 1.3.2.1 According to what is described in 1.3.2, the characteristic magnitudes and phase angles of the current components of the uniform magnetic field generating component are obtained in the reverse excitation mode, and the non-flow induction (or orthogonal) components in the measured potential data are compensated.

[0122] 1.3.2.2 According to what is described in 1.3.2, the velocity distribution of the axisymmetric conducting fluid is obtained according to the power-law imaging algorithm through the compensated array of the magnitudes of motional electromotive forces.

[0123] 1.3.3 All possible velocity distributions of the conducting fluid can be obtained by randomly combining all possible non-axisymmetric velocity components and axisymmetric flow velocity distributions; the optimal solution is selected through a weight function, and the most realistic velocity distribution of the conducting fluid can be determined.

[0124] 1.3.4 According to the requirements of 1.3, the magnitudes of the exciting currents of the components of the uniform magnetic field generating component need to be the same.

[0125] 1.4 The flow rate data of the fluid to be measured is obtained according to the conductive phase velocity distribution and the phase holdup distribution.

[0126] 1.4.1 According to what is described in 1.4, the calculation method of the fluid flow rate data can be calculated by taking the average according to the time window length after the matrix multiplication of the velocity distribution and the phase holdup distribution.

[0127] 1.4.2 According to what is described in 1.4, the calculation method of the fluid flow rate data can be calculated by multiplying after taking the average of the matrix sets of the velocity distribution and the phase holdup matrix for the time window length first.

[0128] 1.4.3 According to what is described in 1.4, the time window length for calculating the fluid flow rate data can be selected according to actual requirements such as frames, seconds, hours, etc.

[0129] 1.4.4 According to what is described in 1.4, the data presentation form can be an image or a data set, where different phases and phase velocities are distinguished in the image by color type and chromaticity, and the data set has a clear identifier indicating the data type.

[0130] 2. Among them, the embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are equally spaced in the circumferential direction of the pipeline.

[0131] 2.1 The induction coil can be a wound coil or in the form of a flexible print;

[0132] 2.2 The induction coil can protrude from the visible area of the outer wall of the pipeline but not contact the fluid;

[0133] 2.3 The induction coil can be embedded in the non-visible area of the pipeline wall thickness but not contact the fluid;

[0134] 2.4 The end face of the electrode pointing to the area to be measured needs to contact the fluid to be measured;

[0135] 2.5 When using nested placement to form an enclosed sensor array, it is necessary to ensure that the centroids of their cross-sections along the pipeline axis are on the same axis;

[0136] 2.5.1 When the electrode and the induction coil are nested to form an enclosed sensor array, it is necessary to ensure that the centroids of their cross-sections along the pipeline axis are on the same axis. It is characterized in that the electrode needs to be made of non-ferromagnetic material;

[0137] 2.6 Use non-nested alternating placement to form an enclosed array;

[0138] 2.6.1 When the electrode and the induction coil are non-nested and alternately placed to form an enclosed array, the electrode material can be ferromagnetic material or non-ferromagnetic material;

[0139] 2.6.2 When the electrode and the induction coil are non-nested and alternately placed to form an enclosed array, when using ferromagnetic material, it is necessary to consider taking shielding measures in the placement gap between the two.

[0140] 3. The uniform magnetic field generating component uses a magnetic source including but not limited to Helmholtz coils and permanent magnets.

[0141] 3.1 If a Helmholtz coil is used as the magnetic source, each side of the coil is composed of multiple sub-coils with different shapes and sizes, and the taps of the multiple sub-coils are connected in sequence.

[0142] 3.2 The magnetic sources need to be symmetrically placed in pairs along the pipeline axis;

[0143] 3.3 The main magnetic field generated by the magnetic source itself or by excitation should cover the cross-section of the area to be measured;

[0144] 3.4 The intensity of the main magnetic field generated by the magnetic source itself or by excitation should be not less than 50 Gauss;

[0145] 4. The frequency range of the high-frequency alternating signal is 1 MHz - 100 MHz.

[0146] 5. The frequency range of the low-frequency alternating signal is 1 - 500 Hz.

[0147] 6. The induced electromotive force is collected by the induction coil in the embedded fusion sensing component and transmitted to the external acquisition system through a low-impedance cable.

[0148] 6.1 The impedance of the cable measured by the impedance analyzer needs to satisfy the low-impedance characteristic within the high-frequency alternating current signal frequency range.

[0149] 7. The motional electromotive force is collected by the end face where the electrode in the embedded fusion sensing component contacts the fluid to be measured and transmitted to the external acquisition system through a low-impedance cable.

[0150] 7.1 The impedance of the cable measured by the impedance analyzer needs to satisfy the low-impedance characteristic within the low-frequency alternating current signal frequency range.

[0151] Another embodiment of the present invention provides a multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive. The embedded fusion sensing component is specifically:

[0152] Supported by the 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 as Figure 2 shown; a material with good conductivity is selected as the electrode, and the electrode contact surface is embedded inside the closed test pipeline. This part contacts the fluid to be measured and receives the induced electromotive force signal. The rear end is embedded in the pipeline to fix the electrode and perform a sealing treatment, and the tail end protrudes outside the pipeline periphery to facilitate the placement of the induction coil; a conductive cable is selected as the induction coil material and fixed at the tail of the electrode in a certain form, and is placed at equal intervals outside the closed pipeline to form a sensor array, as Figure 3 shown.

[0153] The uniform magnetic field generating component is specifically:

[0154] This patent uses a Helmholtz coil as the magnetic source in the uniform magnetic field generating component, which serves as the low-frequency excitation component in the electromagnetic fusion measurement system; Figure 4 is the design diagram of the Helmholtz coil composition. The peripheral sensor of this patent uses a Helmholtz coil made of a conductive cable. Each side of the coil is composed of several sub-coils of different sizes (the 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, improving the magnetic field strength and uniformity.

[0155] The specific steps of the measurement method are:

[0156] The conductivity measurement method proposed in this patent is based on the laws of electromagnetic induction and eddy currents induced in an alternating magnetic field. A high-frequency alternating current signal is used to sequentially excite a coil to generate a primary magnetic field in the area to be measured. When a conductive fluid is in the area to be measured, a secondary magnetic field is generated due to the eddy current effect, and the phase of the induced electromotive force signal on the embedded fusion sensing component will change accordingly. The magnitude of the change is related to the conductivity of the conductive fluid. The process is as Figure 5 , 6 shown. By receiving the phase change of the signal through the embedded fusion sensing component, the conductivity of the fluid at the moment of the cross-section of the closed pipeline to be measured can be obtained. Using array signal processing, the conductivity distribution can be further obtained, and thus the phase fraction distribution of the fluid to be measured can be obtained, and it is represented numerically or graphically.

[0157] The flow velocity is measured by using a low-frequency alternating current signal to excite a uniform magnetic field generating component to generate a main magnetic field in the area to be measured. When a conductive fluid flows through the area to be measured, it will cut the magnetic induction lines of the primary magnetic field 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. Its magnitude depends on the intensity of the induced electric field and corresponds to the flow velocity of the fluid to be measured in the area to be measured. The process is as Figure 7 ,8 shown. By measuring the change in the potential difference of the embedded fusion sensing component, the flow velocity of the fluid in the closed pipeline area to be measured can be obtained, and the flow velocity distribution of the fluid to be measured can be obtained, which is also represented numerically and graphically.

[0158] An embodiment of the present invention provides a multi-channel fusion sensing electromagnetic measurement method with high dynamic wide-spectrum alternating drive.

[0159] The schematic diagram of the electromagnetic fusion measurement system for velocity and conductivity measurement is shown in Figure 4.

[0160] The inner diameter of the simulation test pipeline is 50 mm, the outer diameter is 55 mm, and the wall thickness is 5 mm. The 16-fusion sensor array is evenly distributed on the pipeline cross-section. Among them, the electrode sensor is made of SS316 stainless steel, the diameter of the contact part is 6 mm, and the length is 18 mm; the induction coil is wound with copper wire, the wire diameter is 3 mm, the number of turns is 4, and the coil excitation current is 0.5 A; the Helmholtz coil has 10 layers, 20 turns per layer, the distance between the two groups of coils is 170 mm, the copper wire diameter is 0.8 mm, and the excitation current is 2.5 A.

[0161] The electromagnetic fusion measurement system uses a 10 MHz high-frequency alternating current signal and a 20 Hz low-frequency alternating current signal as excitation signals, and verifies the feasibility of the electromagnetic fusion measurement system in flow velocity and conductivity measurement through simulation experiments.

[0162] 1) The simulation experiment is arranged as follows:

[0163] 1. Build an electromagnetic fusion measurement system according to the simulation parameters;

[0164] 2. Use a 10 MHz 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 area of the pipeline to be measured.

[0165] 3. Add a conductive fluid to the pipeline and record the change in the induced electromotive force at different positions before and after the magnetic field superposition.

[0166] 4. Change the conductivity of the conductive fluid, plot the relationship curve between the conductivity and the change in the induced electromotive force, and verify the feasibility of conductivity measurement.

[0167] 5. Use a 20 Hz low-frequency AC signal to positively and negatively excite the Helmholtz coil to generate a uniform and non-uniform main magnetic field, verify the magnetic field uniformity in the cases of an empty pipe and a full pipe with water respectively, and record the initial value of the magnetic field in the area of the pipeline to be measured; 6. Record the dataset of the induced potential generated by the conductive fluid cutting the magnetic induction line at the array electrode sensor, and verify the feasibility of flow velocity measurement.

[0168] The remaining coils serve 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. Measure the change in the induced electromotive force at different positions before and after the magnetic field superposition, and integrate the electrode part in the sensor to measure the motional electromotive force generated when the conductive fluid flows through the primary magnetic field.

[0169] 2) Verification of the conductivity measurement method:

[0170] The basic principle of the conductivity measurement system is to sequentially excite the induction coils and observe the change in the magnetic induction intensity generated when the conductive working medium passes through the excitation magnetic field. The phase angle of the induced voltage of the receiving coil changes linearly with the conductivity of the measured working medium. By analyzing the change in the phase angle, the conductivity distribution of the working medium can be obtained. According to the coil numbers shown in Figure 3, the excitation coil is determined to be No. 1, and the relationship diagram between the change in the phase angle of the induced voltage of each group of symmetric induction coils and the water conductivity is plotted, as shown in Figures 9 and Figure 10 as shown.

[0171] From Figure 9 and Figure 10 it can be seen that under the excitation of the No. 1 coil, the relationship curve between the phase angle change of the voltage of the symmetric induction coils and the water conductivity is consistent, and overall shows a proportional function relationship. 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 becomes larger; as the conductivity of the water increases, the change in the magnetic induction intensity caused by the measured mass flow passing through the magnetic field gradually increases, and the change in the voltage phase angle gradually increases.

[0172] The experimental results show that the components of the comprehensive flow measurement system will 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 change in the conductivity of the area to be measured.

[0173] 3) Verification of flow velocity measurement method

[0174] The basic principle of the flow velocity measurement system is to calculate the flow velocity through the induced electric field E generated after the conductive fluid flows 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 characterizing the magnetic field characteristics generally adopt the average magnetic flux density Bavg and the magnetic field uniformity Bhom. Bhom is the ratio of the magnetic flux standard deviation of the magnetic field to the average value of the average magnetic flux density within the domain:

[0175] 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 of the magnetic field in the entire region. It is a dimensionless parameter. The smaller the value of Bhom, the more uniform the magnetic field in the region.

[0176] Figure 11 It is the distribution diagram of the primary magnetic field generated by the Helmholtz coil induced by the induction electrode after applying a uniform magnetic field excitation. It can be seen that the magnetic field distribution to a certain extent ensures the magnetic field uniformity in the central region of the pipeline.

[0177] Figure 12 It is the distribution diagram of the primary magnetic field generated by the Helmholtz coil induced by the induction electrode after applying a non-uniform magnetic field excitation

[0178] On this basis, considering the empty pipeline and the full-water pipeline in the simulation, the average magnetic flux density B avg and the magnetic field uniformity Bhom are calculated. For the empty pipeline, the average magnetic flux density B avg in the pipeline cross-section is 73.9150G, and the uniformity index B hom is 0.0015363. When the pipeline is full of water, the average magnetic flux density B avg in the pipeline cross-section is 73.914G, and the uniformity index B hom is 0.0015345, meeting the requirements of the measurement system, that is, a uniform magnetic field in the pipeline can be obtained when the Helmholtz coil is excited in the same direction.

[0179] When the flow velocity of water is 5 m / s, due to the conductive fluid cutting the magnetic induction line to generate an induced electromotive force, an induced electromotive force array can be measured at the array electrode sensor. Taking the induced electromotive force of the 5th electrode as a reference, a dataset of induced electromotive force differences under uniform and non-uniform magnetic fields can be obtained, as shown in Figure 13 and Figure 14 shown.

[0180] It is observed that the dataset of induced electromotive force differences under the uniform magnetic field is centered on the 9th electrode and is symmetrically distributed on both sides, conforming to the induced electromotive force measurement law of the flow velocity measurement system. The dataset of induced electromotive force differences under the non-uniform magnetic field shows a sine distribution and undergoes two cycles of changes, which coincides with the characteristics of the anti-Helmholtz magnetic field.

[0181] The influence of the induction coil on the flow velocity measurement system is almost negligible, and the flow velocity measurement system can ensure the measurement performance when integrating the components of the conductivity measurement system.

[0182] Verified by simulation experiments, when the electromagnetic fusion system proposed in this paper measures the flow velocity, the average magnetic flux density is 73.9150 G (empty pipe) and 73.914 G (full of water); the magnetic field uniformity is 0.00153 (empty pipe) and 0.0015345 (full of water). The induced electromotive force difference under the uniform magnetic field conforms to the induction electromotive force measurement law of the flow velocity measurement system. When measuring the conductivity, the change of the induction voltage phase angle - conductivity is linear. The electromagnetic sensor fusion does not affect the performance of the flow velocity and conductivity measurement parts, providing a new idea for electromagnetic fusion measurement in the field of multiphase flow measurement.

[0183] Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings, the present invention is not limited to the above specific embodiments and application fields. The above specific embodiments are merely illustrative and guiding, rather than restrictive. Under the inspiration of the specification, those of ordinary skill in the art can also make many forms without departing from the scope protected by the claims of the present invention, and these all belong to the scope of protection of the present invention.

Claims

1. A multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive, characterized in that Including: Arranging a uniform magnetic field generating component around the pipeline and embedding an embedded fusion sensing component on the pipeline; Exciting the embedded fusion sensing component with a high-frequency alternating current signal, obtaining the phase change data of the induced electromotive force based on the embedded fusion sensing component, using the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive-phase fluid, and obtaining the conductivity distribution of the conductive-phase fluid by using an inversion method; establishing a fluid model from the conductivity parameter imaging distribution to the phase holdup distribution of the conductive phase, completing the conversion of the conductivity distribution and the phase holdup distribution, and obtaining the phase holdup distribution of the fluid to be measured; Exciting the uniform magnetic field generating component with a low-frequency alternating current signal, obtaining the motional electromotive force data based on the embedded fusion sensing component, and obtaining the velocity distribution of the conductive fluid to be measured according to the motional electromotive force data; Obtaining the flow rate data of the fluid to be measured according to the velocity distribution and the phase holdup distribution of the conductive phase.

2. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, wherein the embedded fusion sensing component includes electrodes and induction coils, and the embedded fusion sensing components are evenly distributed in the circumferential direction of the pipeline.

3. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein the induction coil is in the form of a wound coil or a flexible printed coil.

4. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein The induction coil is embedded in the visible or non-visible area of the pipeline wall thickness and does not contact the fluid.

5. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein the end face of the electrode pointing to the area to be measured contacts the fluid to be measured.

6. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein the embedded fusion sensing components are arranged in a non-nested and alternating manner to form an enclosed array on the pipeline.

7. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 6, wherein the electrode material is a ferromagnetic material or a non-ferromagnetic material.

8. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 7, when the electrode is made of a ferromagnetic material, a shielding measure is taken in the gap between the electrode and the induction coil.

9. The multi-channel fusion sensing electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein 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.

10. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 9, characterized in that , the electrode is a non-ferromagnetic material.

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

12. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 11, wherein The impedance measured by the cable through the impedance analyzer needs to meet the low-impedance characteristic within the frequency range of the high-frequency alternating current signal.

13. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 2, wherein The motional electromotive force is collected by the end face of the electrode in the embedded fusion sensing component that contacts the fluid to be measured and transmitted to the external acquisition system through a low-impedance cable.

14. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 13, characterized in that, The impedance measured by the cable through the impedance analyzer needs to meet the low-impedance characteristic within the frequency range of the low-frequency alternating current signal.

15. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, characterized in that The method for obtaining the phase fraction distribution of the fluid to be measured based on the phase change data of the induced electromotive force signal is specifically as follows: Utilize the linear relationship between the phase change of the induced electromotive force signal and the conductivity of the conductive-phase fluid, and adopt an inversion method to obtain the conductivity distribution of the conductive-phase fluid. Then, establish a fluid model from the conductivity parameter imaging distribution to the phase fraction distribution of the conductive phase to complete the conversion between the conductivity distribution and the phase fraction distribution.

16. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive 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 multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 16, characterized in that, If a Helmholtz coil is used as the magnetic source, each side coil of the Helmholtz coil consists of multiple sub-coils with different shapes and sizes, and the multiple sub-coil taps are connected in sequence.

18. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 16, wherein The magnetic sources need to be arranged symmetrically in pairs along the axial direction of the pipeline.

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

20. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 16, characterized in that, The intensity of the main magnetic field generated by the magnetic source itself or by excitation should be not less than 50 Gauss.

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

22. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, characterized in that, By exciting the uniform magnetic field generating component with a low-frequency alternating current signal, the method for obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a uniform magnetic field through forward excitation, and obtain an array of motional electromotive force amplitudes under the uniform magnetic field distribution.

23. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 22, characterized in that, The method for obtaining the velocity distribution of the conductive fluid to be measured based on the motional electromotive force data is specifically as follows: Under the condition of obtaining the forward excitation mode, obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component, compensate for the non-flow induction or orthogonal component in the measured potential data. Through the compensated array of motional electromotive force amplitudes, obtain all possible velocity distributions of the non-axisymmetric conductive fluid and the average velocity of the axisymmetric component according to the high-order imaging algorithm.

24. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, characterized in that By exciting the uniform magnetic field generating component with a low-frequency alternating current signal, the method for obtaining the motional electromotive force data based on the embedded fusion sensing component is specifically as follows: Obtain a non-uniform magnetic field distribution through reverse excitation, and obtain an array of motional electromotive force amplitudes under the non-uniform magnetic field distribution.

25. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 24, characterized in that, Obtain the characteristic amplitude and phase angle of the current component of the uniform magnetic field generating component in the reverse excitation mode, compensate for the non-flow induction or orthogonal component in the measured potential data. Through the compensated array of motional electromotive force amplitudes, obtain the velocity distribution of the axisymmetric conductive fluid according to the power-law imaging algorithm, and then obtain the velocity distribution of the conductive fluid based on the velocity distribution of the axisymmetric conductive fluid.

26. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 24, characterized in that, The method for obtaining the velocity distribution of the conductive fluid based on the velocity distribution of the axisymmetric conductive fluid is specifically as follows: Randomly combine all possible non-axisymmetric velocity components and the axisymmetric flow velocity distribution to obtain all possible velocity distributions of the conductive fluid, and select the optimal solution through a weight function to determine the velocity distribution of the conductive fluid.

27. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, wherein The calculation method of the fluid flow rate data is calculated by taking the average of the matrix product of the velocity distribution and the phase fraction distribution according to the time window length.

28. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, wherein The calculation method of the fluid flow rate data is calculated by first taking the average of the matrix sets of the velocity distribution and the phase fraction matrix according to the time window length and then multiplying.

29. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 27 or 28, characterized in that, The time window length for calculating the fluid flow rate data is selected according to frames, seconds or hours.

30. The multi-channel fusion perception electromagnetic measurement method with high-dynamic wide-spectrum alternating drive according to claim 1, wherein The frequency range of the high-frequency alternating current signal is 1 MHz - 100 MHz.

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

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