Current magnetic source inversion positioning method and device based on unidirectional magnetic field gradient

Abstract

The embodiment of the invention provides a current magnetic source inversion positioning method and device based on a unidirectional magnetic field gradient, and the method comprises the steps: determining a fluxgate probe, and determining an auxiliary testing tool based on the fluxgate probe; wherein the auxiliary test tool comprises a two-dimensional grid; acquiring magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining a current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution. The method comprises the following steps: acquiring magnetic field data through a fluxgate probe based on a two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining a current density distribution based on the magnetic field gradient data; the current magnetic source position information is determined based on the current density distribution, and the diagnosis of the current state in the equipment and the judgment of the abnormal current value can be realized.

Description

Technical Field

[0001] The embodiments of this specification relate to the field of electromagnetic measurement technology, and in particular to a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient. Background Art

[0002] As electronic devices develop towards miniaturization and integration, the current distribution inside them becomes more and more complex, and traditional current measurement methods often fail to meet the requirements of high precision and high efficiency. Traditional current measurement methods mainly include using current clamps or direct measurement, which have many limitations in practical applications.

[0003] First, when using a current clamp to measure current, it is necessary to clamp the current clamp on the conductor, which may not be applicable in certain situations, especially when it is necessary to measure the current inside the equipment or in difficult-to-access areas. In addition, the current clamp has a limited measurement range, and its measurement accuracy will also be affected for large current or high-frequency current signals.

[0004] Secondly, the method of directly measuring current usually requires a resistor or ammeter to be connected in series in the circuit, and the current value is calculated by measuring the voltage across the resistor or the reading of the ammeter. However, this method requires opening the device casing and modifying the circuit, which is not only cumbersome to operate, but may also affect the normal operation of the device. More importantly, the method of directly measuring current cannot provide detailed information on the current distribution, and it is difficult to meet the needs of accurate analysis of the current magnetic source.

[0005] Therefore, a better solution is urgently needed. Summary of the invention

[0006] In view of this, the embodiments of this specification provide a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient. One or more embodiments of this specification also relate to a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient, a computing device, a computer-readable storage medium and a computer program to solve the technical defects existing in the prior art.

[0007] According to a first aspect of an embodiment of this specification, a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient is provided, comprising:

[0008] Determine a fluxgate probe, and determine an auxiliary test tooling based on the fluxgate probe; wherein the auxiliary test tooling includes a two-dimensional grid;

[0009] Collect magnetic field data through fluxgate probe based on two-dimensional grid;

[0010] determining magnetic field gradient data based on the magnetic field data, and determining a current density distribution based on the magnetic field gradient data;

[0011] The current magnetic source position information is determined based on the current density distribution.

[0012] In a possible implementation, determining a fluxgate probe includes:

[0013] Determine the probe type, sensitivity information, and sampling rate information;

[0014] Two fluxgate probes are determined based on the probe type, sensitivity information and sampling rate information; and a distance between the two fluxgate probes is adjustable.

[0015] In a possible implementation, the auxiliary test fixture includes a platform structure and a two-dimensional grid;

[0016] The platform structure includes pillars;

[0017] The platform is set up above the equipment to be tested, and the height of the platform can be adjusted;

[0018] A two-dimensional grid is set on the platform.

[0019] In a possible implementation, magnetic field data is collected by a fluxgate probe based on a two-dimensional grid, including:

[0020] In the odd-numbered rows of the two-dimensional grid, magnetic field data of the first cell is collected from the device under test by a fluxgate probe in a first order;

[0021] In the even-numbered rows of the two-dimensional grid, magnetic field data of the second cell is collected from the device under test by a fluxgate probe in a second order;

[0022] The magnetic field data is determined based on the first cell magnetic field data and the second cell magnetic field data.

[0023] In a possible implementation, determining the current density distribution based on the magnetic field gradient data includes:

[0024] Discretize the continuous space into multiple small cubic units;

[0025] Determine the current density distribution of the small cubic unit based on the magnetic field gradient data;

[0026] The current density distribution is determined based on the current density distribution of a plurality of small cubic units.

[0027] In a possible implementation, determining the current density distribution of the small cubic unit based on the magnetic field gradient data includes:

[0028] Determine the linear equations of current density of each small cubic unit based on magnetic field gradient data;

[0029] The current density distribution of the small cubic unit is determined by solving the linear equations of current density numerically.

[0030] In a possible implementation, determining the current magnetic source position information based on the current density distribution includes:

[0031] Determining display information based on current density distribution;

[0032] Current magnetic source position information is determined based on the presentation information.

[0033] According to a second aspect of the embodiments of this specification, a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient is provided, comprising:

[0034] A tool determination module is configured to determine a fluxgate probe, and determine an auxiliary test tool based on the fluxgate probe; wherein the auxiliary test tool includes a two-dimensional grid;

[0035] A data acquisition module is configured to acquire magnetic field data through a fluxgate probe based on a two-dimensional grid;

[0036] a current density module configured to determine magnetic field gradient data based on the magnetic field data, and to determine a current density distribution based on the magnetic field gradient data;

[0037] The position information module is configured to determine the current magnetic source position information based on the current density distribution.

[0038] According to a third aspect of an embodiment of this specification, a computing device is provided, including:

[0039] Memory and processor;

[0040] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the current magnetic source inversion positioning method based on unidirectional magnetic field gradient are implemented.

[0041] According to a fourth aspect of the embodiments of this specification, a computer-readable storage medium is provided, which stores computer-executable instructions, and when the instructions are executed by a processor, the steps of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient are implemented.

[0042] According to a fifth aspect of the embodiments of this specification, a computer program is provided, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0043] The embodiments of this specification provide a method and device for inversion positioning of a current magnetic source based on a unidirectional magnetic field gradient, wherein the method for inversion positioning of a current magnetic source based on a unidirectional magnetic field gradient includes: determining a fluxgate probe, and determining an auxiliary test tooling based on the fluxgate probe; wherein the auxiliary test tooling includes a two-dimensional grid; collecting magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution. By collecting magnetic field data through a fluxgate probe based on a two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution, it is possible to diagnose the current state inside the device and determine the abnormal current value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a flow chart of a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient provided by an embodiment of this specification;

[0045] Figure 2 It is a schematic diagram of grid measuring points of a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient provided by an embodiment of this specification;

[0046] Figure 3 It is a structural schematic diagram of a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient provided by an embodiment of this specification;

[0047] Figure 4 It is a structural block diagram of a computing device provided by an embodiment of this specification. DETAILED DESCRIPTION

[0048] Many specific details are described in the following description to facilitate a full understanding of this specification. However, this specification can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of this specification, so this specification is not limited to the specific implementation disclosed below.

[0049] The terms used in one or more embodiments of this specification are only for the purpose of describing specific embodiments, and are not intended to limit one or more embodiments of this specification. The singular forms of "a" and "the" used in one or more embodiments of this specification and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used in one or more embodiments of this specification refers to and includes any or all possible combinations of one or more associated listed items.

[0050] It should be understood that although the terms first, second, etc. may be used to describe various information in one or more embodiments of this specification, this information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of one or more embodiments of this specification, the first may also be referred to as the second, and similarly, the second may also be referred to as the first. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0051] In this specification, a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient is provided. This specification also relates to a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient, a computing device, and a computer-readable storage medium, which are described in detail one by one in the following embodiments.

[0052] See also Figure 1 , Figure 1 A flow chart of a current magnetic source inversion positioning method based on a unidirectional magnetic field gradient provided according to an embodiment of the present specification is shown, which specifically includes the following steps.

[0053] Step 101: determine a fluxgate probe, and determine an auxiliary test tooling based on the fluxgate probe; wherein the auxiliary test tooling includes a two-dimensional grid.

[0054] In a possible implementation, determining a fluxgate probe includes: determining a probe type, sensitivity information, and sampling rate information; determining two fluxgate probes based on the probe type, sensitivity information, and sampling rate information; and the distance between the two fluxgate probes is adjustable.

[0055] In practical applications, select a suitable three-axis vector fluxgate probe and adjust the probe spacing and fixture structure according to actual needs. Fix the probe on the fixture and connect it to the data acquisition device and signal processing equipment through a signal cable. At the same time, build the auxiliary test fixture and adjust the platform height and two-dimensional grid size.

[0056] Specifically, the following requirements are included in the selection of probes. Probe type: Select two three-axis vector fluxgate probes to ensure that the magnetic field components in three orthogonal directions can be measured simultaneously. Sensitivity requirements: The sensitivity of the probe is better than 20pT / sqrt(Hz)@1Hz to ensure sufficient measurement accuracy. Sampling rate: The magnetic field sampling rate is greater than 1kHz to meet the needs of real-time monitoring and measurement of higher frequency AC currents. Synchronous acquisition: The two probes have the ability to collect magnetic field data completely synchronously and have a unified synchronization signal to ensure that the magnetic field gradient interference is minimized. Adjustable spacing: The probe spacing d needs to be adjusted according to the device size, d=Lmax*c, where Lmax is the maximum scale of the device, the unit is the same as d, cm; c is a dimensionless coefficient, and the value range is 3-6.

[0057] In a possible implementation, the auxiliary test tooling includes a platform structure and a two-dimensional grid; the platform structure includes pillars; the platform is erected above the device to be tested, and the height of the platform is adjustable; and the two-dimensional grid is set on the platform.

[0058] In actual applications, the process of building test tooling includes tooling design, system connection and auxiliary test tooling design.

[0059] Among them, the tooling design includes: Material selection: Use non-magnetic materials to make the probe tooling, such as copper, aluminum alloy, titanium alloy and other materials with relative magnetic permeability lower than 1.001, to reduce external interference. Alignment and fixation: Align and fix the probe on the tooling to ensure the relative position between the probes is stable. Overall appearance: After the probe is fixed on the tooling, the overall appearance is a rectangular parallelepiped, which is easy to operate and carry. Collection button: The tooling is equipped with a button for issuing data collection instructions. Only within 10 seconds after the button is pressed, the data collector supporting the probe will start data collection.

[0060] Furthermore, the system connection includes: Signal cable: The probe array is connected to the supporting data acquisition device and signal processing equipment (computer) through a 2m-5m signal cable, and the supporting data acquisition device and signal processing equipment are not less than 1.5m away from the probe array. Data acquisition device: responsible for receiving the magnetic field data collected by the probe and performing preliminary processing. Signal processing equipment: further analyzes and processes the collected data, and inversely calculates the current distribution.

[0061] Furthermore, the design of auxiliary test tooling includes: Platform structure: Design a platform with 4 pillars, which is placed directly above the device to be tested. The distance between the platform and the device can be adjusted within the range of 2-20cm to accommodate devices to be tested at different heights. Two-dimensional grid: A two-dimensional grid is drawn on the platform, and the smallest grid is a square with a side length of 1cm. These grids are used to guide the handheld magnetic field gradient probe tooling for scanning measurements. Material selection: Use non-magnetic materials to make the probe tooling, such as copper, aluminum alloy, titanium alloy and other materials with a relative magnetic permeability lower than 1.001 to reduce external interference. Platform level adjustment: The platform needs to be equipped with a two-dimensional level, and the platform needs to be adjusted to a horizontal state during testing.

[0062] Step 102: Collect magnetic field data through a fluxgate probe based on a two-dimensional grid.

[0063] In one possible implementation, magnetic field data is collected through a fluxgate probe based on a two-dimensional grid, including: collecting first cell magnetic field data from a device under test through a fluxgate probe in a first order in odd-numbered rows of the two-dimensional grid; collecting second cell magnetic field data from the device under test through a fluxgate probe in a second order in even-numbered rows of the two-dimensional grid; and determining magnetic field data based on the first cell magnetic field data and the second cell magnetic field data.

[0064] In actual application, the auxiliary test fixture is placed directly above the electronic device under test, and the data acquisition device and signal processing device are started. The handheld magnetic field gradient probe fixture moves along a zigzag route above the magnetic field generated by the device under test, starts synchronously collecting magnetic field data, and transmits the data to the data acquisition device.

[0065] Specifically, when performing scanning measurements, the magnetic field gradient probe needs to be held close to the tooling platform and moved along a zigzag route above the magnetic field generated by the device under test to ensure full coverage of the area under test and obtain accurate magnetic field data.

[0066] Step 103: Determine magnetic field gradient data based on the magnetic field data, and determine current density distribution based on the magnetic field gradient data.

[0067] In practical applications, the data collector performs preliminary processing on the received data, such as denoising and filtering. Then, the processed data is sent to the signal processing device for in-depth analysis. The signal processing device processes the data according to the preset algorithm, extracts the current distribution information, and calculates the location of the current magnetic source.

[0068] In a possible implementation, determining the current density distribution based on magnetic field gradient data includes: discretizing the continuous space into multiple small cube units; determining the current density distribution of the small cube units based on the magnetic field gradient data; and determining the current density distribution based on the current density distribution of multiple small cube units.

[0069] In practical applications, the magnetic field data measured by the probe is spatially differentiated to obtain the magnetic field gradient tensor G. The relationship between current density and magnetic field gradient is established using the Biot-Savart law. The continuous space is discretized into multiple small cubic units, and the current density is solved in each unit. The current density values ​​of all units are combined to obtain the current density distribution J(r) in the entire measured area.

[0070] In a possible implementation, the current density distribution of the small cube unit is determined based on the magnetic field gradient data, including: determining the current density linear equation group of each small cube unit based on the magnetic field gradient data; solving the current density linear equation group by a numerical method to determine the current density distribution of the small cube unit.

[0071] In practical applications, see Figure 2 , assume that the magnetic field data collected synchronously by the two fluxgate probes are B1 (B1x, B1y, B1z) and B2 (B2x, B2y, B2z);

[0072] Bg = B1-B2;

[0073] Bgx = B1x - B2x;

[0074] Bgy=B1y-B2y;

[0075] Bgz=B1z-B2z;

[0076] The magnetic field gradient tensor G is calculated based on the magnetic field data Bg collected by the probe.

[0077]

[0078] Specifically, the gradient tensor G is calculated using the cross-shaped measurement point data Bg, that is, G(m, n) is calculated using the four measurement point data Bg(m-1, n), Bg(m+1, n), Bg(m, n-1), and Bg(m, n+1).

[0079] The relationship between current density J and magnetic field gradient G is established using the Biot-Savart law.

[0080] By solving the above equations, the current density distribution J(r) is obtained. In order to simplify the calculation process, the finite element analysis method can be used to discretize the continuous space into multiple small units, and then solve the current density in each unit. The specific steps are as follows:

[0081] The area to be measured is divided into N small cubic units, each with a side length of Δx, Δy, and Δz. Assuming that the current density J is a constant in each unit, the magnetic field contribution in the unit can be calculated by integration. According to the magnetic field gradient data measured by the probe, a linear equation group about the current density in each unit is established. The equation group is solved using numerical methods (such as Gaussian elimination method, conjugate gradient method, etc.) to obtain the current density value in each unit. By combining the current density values ​​of all units, the current density distribution J(r) in the entire area to be measured can be obtained.

[0082] Step 104: Determine the current magnetic source position information based on the current density distribution.

[0083] In a possible implementation, determining the current magnetic source position information based on the current density distribution includes: determining the display information based on the current density distribution; and determining the current magnetic source position information based on the display information.

[0084] In practical applications, the current distribution diagram inside the electronic device is drawn based on the calculated current density distribution. In order to present the results more intuitively, pseudo-color maps or contour maps can be used to represent the magnitude and distribution of the current density.

[0085] Furthermore, the calculated current magnetic source position information can be output in the form of a chart or text for user reference and use to identify erroneous data.

[0086] The embodiments of this specification provide a method and device for inversion positioning of a current magnetic source based on a unidirectional magnetic field gradient, wherein the method for inversion positioning of a current magnetic source based on a unidirectional magnetic field gradient includes: determining a fluxgate probe, and determining an auxiliary test tooling based on the fluxgate probe; wherein the auxiliary test tooling includes a two-dimensional grid; collecting magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution. By collecting magnetic field data through a fluxgate probe based on a two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution, it is possible to diagnose the current state inside the device and determine the abnormal current value.

[0087] Corresponding to the above method embodiment, this specification also provides an embodiment of a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient, Figure 3 FIG. 1 shows a schematic diagram of a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient provided by an embodiment of the present specification. Figure 3 As shown, the device comprises:

[0088] The tool determination module 301 is configured to determine a fluxgate probe, and determine an auxiliary test tool based on the fluxgate probe; wherein the auxiliary test tool includes a two-dimensional grid;

[0089] The data acquisition module 302 is configured to acquire magnetic field data through a fluxgate probe based on a two-dimensional grid;

[0090] A current density module 303 is configured to determine magnetic field gradient data based on the magnetic field data, and determine current density distribution based on the magnetic field gradient data;

[0091] The position information module 304 is configured to determine the current magnetic source position information based on the current density distribution.

[0092] In a possible implementation, determining a fluxgate probe includes:

[0093] Determine the probe type, sensitivity information, and sampling rate information;

[0094] Two fluxgate probes are determined based on the probe type, sensitivity information and sampling rate information; and a distance between the two fluxgate probes is adjustable.

[0095] In a possible implementation, the auxiliary test fixture includes a platform structure and a two-dimensional grid;

[0096] The platform structure includes pillars;

[0097] The platform is set up above the equipment to be tested, and the height of the platform can be adjusted;

[0098] A two-dimensional grid is set on the platform.

[0099] In a possible implementation, magnetic field data is collected by a fluxgate probe based on a two-dimensional grid, including:

[0100] In the odd-numbered rows of the two-dimensional grid, magnetic field data of the first cell is collected from the device under test by a fluxgate probe in a first order;

[0101] In the even-numbered rows of the two-dimensional grid, magnetic field data of the second cell is collected from the device under test by a fluxgate probe in a second order;

[0102] The magnetic field data is determined based on the first cell magnetic field data and the second cell magnetic field data.

[0103] In a possible implementation, determining the current density distribution based on the magnetic field gradient data includes:

[0104] Discretize the continuous space into multiple small cubic units;

[0105] Determine the current density distribution of the small cubic unit based on the magnetic field gradient data;

[0106] The current density distribution is determined based on the current density distribution of a plurality of small cubic units.

[0107] In a possible implementation, determining the current density distribution of the small cubic unit based on the magnetic field gradient data includes:

[0108] Determine the linear equations of current density of each small cubic unit based on magnetic field gradient data;

[0109] The current density distribution of the small cubic unit is determined by solving the linear equations of current density numerically.

[0110] In a possible implementation, determining the current magnetic source position information based on the current density distribution includes:

[0111] Determining display information based on current density distribution;

[0112] Current magnetic source position information is determined based on the presentation information.

[0113] The embodiments of this specification provide a method and device for inversion positioning of a current magnetic source based on a unidirectional magnetic field gradient, wherein the inversion positioning device for a current magnetic source based on a unidirectional magnetic field gradient includes: determining a fluxgate probe, and determining an auxiliary test tooling based on the fluxgate probe; wherein the auxiliary test tooling includes a two-dimensional grid; collecting magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution. By collecting magnetic field data through a fluxgate probe based on a two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; and determining current magnetic source position information based on the current density distribution, it is possible to diagnose the current state inside the device and determine the abnormal current value.

[0114] The above is a schematic scheme of a current magnetic source inversion positioning device based on a unidirectional magnetic field gradient of this embodiment. It should be noted that the technical scheme of the current magnetic source inversion positioning device based on a unidirectional magnetic field gradient and the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient belong to the same concept, and the details not described in detail in the technical scheme of the current magnetic source inversion positioning device based on a unidirectional magnetic field gradient can be referred to the description of the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0115] Figure 4 The block diagram of a computing device 400 according to one embodiment of the present specification is shown. The components of the computing device 400 include but are not limited to a memory 410 and a processor 420. The processor 420 is connected to the memory 410 via a bus 430, and the database 450 is used to store data.

[0116] The computing device 400 also includes an access device 440 that enables the computing device 400 to communicate via one or more networks 460. Examples of these networks include a public switched telephone network (PSTN), a local area network (LAN), a wide area network (WAN), a personal area network (PAN), or a combination of communication networks such as the Internet. The access device 440 may include one or more of any type of network interface (e.g., a network interface card (NIC)) that is wired or wireless, such as an IEEE 802.11 wireless local area network (WLAN) wireless interface, a world-wide interoperability for microwave access (Wi-MAX) interface, an Ethernet interface, a universal serial bus (USB) interface, a cellular network interface, a Bluetooth interface, and a near field communication (NFC).

[0117] In one embodiment of the present specification, the above components of the computing device 400 and Figure 4 Other components not shown in the figure may also be connected to each other, for example, via a bus. It should be understood that Figure 4 The computing device structure block diagram shown is only for the purpose of illustration, and is not intended to limit the scope of this specification. Those skilled in the art can add or replace other components as needed.

[0118] The computing device 400 may be any type of stationary or mobile computing device, including a mobile computer or mobile computing device (e.g., a tablet computer, a personal digital assistant, a laptop computer, a notebook computer, a netbook, etc.), a mobile phone (e.g., a smart phone), a wearable computing device (e.g., a smart watch, smart glasses, etc.), or other types of mobile devices, or a stationary computing device such as a desktop computer or a personal computer (PC). The computing device 400 may also be a mobile or stationary server.

[0119] The processor 420 is used to execute the following computer executable instructions, which, when executed by the processor, implement the steps of the above-mentioned current magnetic source inversion positioning method based on a unidirectional magnetic field gradient. The above is a schematic scheme of a computing device of this embodiment. It should be noted that the technical scheme of the computing device and the technical scheme of the above-mentioned current magnetic source inversion positioning method based on a unidirectional magnetic field gradient belong to the same concept. The details not described in detail in the technical scheme of the computing device can be found in the description of the technical scheme of the above-mentioned current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0120] An embodiment of the present specification also provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0121] The above is a schematic scheme of a computer-readable storage medium of this embodiment. It should be noted that the technical scheme of the storage medium and the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient are of the same concept, and the details not described in detail in the technical scheme of the storage medium can be found in the description of the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0122] An embodiment of the present specification also provides a computer program, wherein when the computer program is executed in a computer, the computer is caused to execute the steps of the above-mentioned current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0123] The above is a schematic scheme of a computer program of this embodiment. It should be noted that the technical scheme of the computer program and the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient are of the same concept, and the details not described in detail in the technical scheme of the computer program can be found in the description of the technical scheme of the current magnetic source inversion positioning method based on a unidirectional magnetic field gradient.

[0124] The above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0125] The computer instructions include computer program codes, which may be in source code form, object code form, executable files or some intermediate forms, etc. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0126] It should be noted that, for the above-mentioned method embodiments, for the sake of simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the embodiments of this specification are not limited by the order of the actions described, because according to the embodiments of this specification, some steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the embodiments of this specification.

[0127] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0128] The preferred embodiments of this specification disclosed above are only used to help explain this specification. The optional embodiments do not describe all the details in detail, nor do they limit the invention to only the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of the embodiments of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the embodiments of this specification, so that technicians in the relevant technical field can well understand and use this specification. This specification is only limited by the claims and their full scope and equivalents.

Claims

1. A current magnetic source inversion positioning method based on unidirectional magnetic field gradient, characterized in that: include: Determine a fluxgate probe, and determine an auxiliary test fixture based on the fluxgate probe; wherein the auxiliary test fixture includes a two-dimensional grid; Collecting magnetic field data through a fluxgate probe based on the two-dimensional grid; determining magnetic field gradient data based on the magnetic field data, and determining current density distribution based on the magnetic field gradient data; Current magnetic source position information is determined based on the current density distribution.

2. The method according to claim 1, characterized in that The method of determining a fluxgate probe comprises: Determine the probe type, sensitivity information, and sampling rate information; Two fluxgate probes are determined based on the probe type, the sensitivity information and the sampling rate information; and the distance between the two fluxgate probes is adjustable.

3. The method according to claim 1, characterized in that The auxiliary test fixture includes a platform structure and a two-dimensional grid; The platform structure includes pillars; The platform is erected above the device to be tested, and the height of the platform is adjustable; The two-dimensional grid is disposed on the platform.

4. The method according to claim 1, characterized in that: The collecting magnetic field data through a fluxgate probe based on the two-dimensional grid includes: In the odd-numbered rows of the two-dimensional grid, magnetic field data of the first cell is collected from the device to be tested by a fluxgate probe in a first order; In the even-numbered rows of the two-dimensional grid, magnetic field data of second cells are collected from the device to be tested by a fluxgate probe in a second order; Magnetic field data is determined based on the first cell magnetic field data and the second cell magnetic field data.

5. The method according to claim 1, characterized in that The determining of the current density distribution based on the magnetic field gradient data comprises: Discretize the continuous space into multiple small cubic units; Determining the current density distribution of the small cubic unit based on the magnetic field gradient data; A current density distribution is determined based on the current density distributions of the plurality of small cubic units.

6. The method according to claim 5, characterized in that The determining the current density distribution of the small cubic unit based on the magnetic field gradient data comprises: Determine a linear equation group of current density of each of the small cubic units based on the magnetic field gradient data; The current density linear equations are solved by numerical methods to determine the current density distribution of the small cubic unit.

7. The method according to claim 1, characterized in that The determining of the current magnetic source position information based on the current density distribution includes: determining display information based on the current density distribution; Current magnetic source position information is determined based on the presentation information.

8. A current magnetic source inversion positioning device based on unidirectional magnetic field gradient, characterized in that: include: A tool determination module is configured to determine a fluxgate probe, and determine an auxiliary test tool based on the fluxgate probe; wherein the auxiliary test tool includes a two-dimensional grid; A data acquisition module is configured to acquire magnetic field data through a fluxgate probe based on the two-dimensional grid; a current density module configured to determine magnetic field gradient data based on the magnetic field data, and to determine a current density distribution based on the magnetic field gradient data; The position information module is configured to determine the current magnetic source position information based on the current density distribution.

9. A computing device, characterized in that include: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the current magnetic source inversion positioning method based on unidirectional magnetic field gradient as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the current magnetic source inversion positioning method based on unidirectional magnetic field gradient as described in any one of claims 1 to 7.

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