CN-122017710-A - Magnetic impurity simulation method, device and system based on current dipole

Abstract

A magnetic impurity simulation method, device and system based on a current dipole belongs to the technical field of nondestructive testing, and solves the problem of how to improve the simulation precision of magnetic impurities; the method comprises the steps of inputting simulation parameters of target magnetic impurity particles, calculating target driving current, introducing a medium correction coefficient to reversely correct the target driving current, solving actual driving current, applying the actual driving current to a current dipole array of a selected level to generate a simulation magnetic field, and extracting a simulation magnetic field signal based on a phase-locked amplification technology for magnetic field signal inversion verification or sensitivity calibration. According to the invention, the magnetic moment generated by the current dipole is equivalent to the excitation moment of the magnetic impurity, the medium correction coefficient k is introduced to carry out inverse correction on the target driving current, the actual driving current is solved, the magnitude mapping relation from the magnetic impurity particle parameter to the actual driving current is established, and the precision and the reliability of the sensitivity calibration of the quantum detection equipment are improved.

Inventors

• PENG BO
• ZHU TAIYUN
• WANG QINGJUN
• ZHANG SHUJUAN
• SHI WEIHAO
• YUAN YIWEI
• HUANG YAJIE
• ZHAO LONG
• QIU RUJIA
• XUE BING
• TIAN TENG
• WANG ENHUI
• GENG JIAQI

Assignees

• 国网安徽省电力有限公司电力科学研究院

Dates

Publication Date

20260512

Application Date

20260330

Claims (10)

1. 1. The magnetic impurity simulation method based on the current dipole is characterized by comprising the following steps of: Filling a sample container with base powder, embedding a multi-level current dipole array in the base powder, and respectively fixing the multi-level current dipole array at different depths inside the sample container; inputting simulation parameters of target magnetic impurity particles, calculating target driving current, introducing a medium correction coefficient to reversely correct the target driving current, and solving actual driving current; Applying an actual drive current to the current dipole array at a selected level to produce an analog magnetic field; And extracting an analog magnetic field signal based on a phase-locked amplification technology, and using the analog magnetic field signal for magnetic field signal inversion verification or sensitivity calibration.
2. 2. The method of current dipole-based magnetic impurity simulation according to claim 1, further comprising: And selecting current dipole arrays of different levels to electrify through the multi-channel switching matrix so as to simulate the magnetic field attenuation characteristics under different burial depths.
3. 3. The method of claim 1, wherein the base powder is a non-magnetic powder or a base powder having a specific magnetic permeability.
4. 4. The method for simulating magnetic impurities based on current dipoles according to claim 1, wherein the calculating the target driving current is specifically: first, for spherical magnetic particles with radius R, the excited magnetic moment is solved : Wherein, the For diameter, the mathematical relationship d=2r is satisfied, For the magnetic susceptibility of the base powder, For exciting the magnetic field intensity; Then, solving the equivalent magnetic moment generated by the current dipole : Wherein, the The number of turns of the coil that is the current dipole, In order to be of an equivalent area, Driving a current for a target; Then, let the two equivalent, calculate the target driving current : 。
5. 5. The method for simulating magnetic impurities based on current dipole according to claim 4, the method is characterized in that the medium correction coefficient is calibrated by the following steps: Firstly, measuring a reference magnetic field amplitude B 0 under the condition of no base powder; Then, after filling the target base powder, measuring the magnetic field amplitude B 1 ; finally, defining correction coefficient 。
6. 6. The method for simulating magnetic impurities based on a current dipole as set forth in claim 1, wherein said actual drive current Expressed using the following logic: Wherein, the For the target drive current, k is a correction coefficient.
7. 7. The magnetic impurity simulation device based on the current dipoles is characterized by comprising a sample container, a supporting frame, current dipole arrays, lead wires and base powder, wherein a plurality of layers of supporting frames are arranged in the sample container, the current dipole arrays are arranged on the surfaces of the supporting frames in sequence along the axial direction of the sample container, the lead wires are led out along the direction perpendicular to the plane where the current dipole arrays are located by adopting a twisted pair structure and are arranged on the inner wall of the sample container, the base powder is filled in the sample container, and the current dipole arrays are buried in the base powder.
8. 8. The magnetic impurity simulation device based on the current dipole according to claim 7, further comprising a signal generator, wherein the signal generator at least comprises a control unit, a digital-to-analog converter, a voltage-controlled current source and a current closed-loop detection module, the control unit controls the digital-to-analog converter to output analog voltage according to the driving current value, the analog voltage is converted into output current through the voltage-controlled current source, and the current closed-loop detection module monitors the output current in real time and feeds the output current back to the control unit.
9. 9. The current dipole-based magnetic impurity simulation device according to claim 8, further comprising a multiplexing switching matrix, wherein two ends of the multiplexing switching matrix are respectively connected with the signal generator and the current dipole array and used for switching the current dipole arrays at different levels and applying the output current to the selected current dipole arrays.
10. 10. A magnetic impurity simulation system based on current dipoles, comprising: Using the current dipole based magnetic impurity simulation device of any one of claims 7 to 9; The quantum magnetometer is used for collecting the analog magnetic field signal generated by the analog device; A controller, respectively connected to the quantum magnetometer and the simulation device, for performing the current dipole-based magnetic impurity simulation method according to any one of claims 1 to 6.

Description

Magnetic impurity simulation method, device and system based on current dipole Technical Field The invention belongs to the technical field of extremely weak magnetic measurement and nondestructive detection, and relates to a magnetic impurity simulation method, device and system based on a current dipole. Background By low abundance magnetic impurities is meant atoms or ions having a magnetic moment, such as iron, cobalt, nickel, manganese, etc., present in the material in very low levels, in ppm or ppb levels. In the fields of new energy sources (such as lithium iron phosphate battery materials), energy storage and powder metallurgy, if trace magnetic impurities are mixed in the materials, the safety performance of products can be seriously affected. The prior literature, such as the "closed-loop SERF atomic magnetometer key technical research and its application" (Guo Qingqian, biomedical engineering. [ D ]. University of Chinese science and technology [2026-03-26 ]), discloses the detection of low abundance magnetic impurities using a high sensitivity sub-magnetometer, such as a SERF atomic magnetometer. However, in the detection of low abundance magnetic impurities in industrial materials, the following problems remain: (1) Calibration is difficult, the diameter of a real tiny magnetic particle is usually in the range of 10-100 μm, the position of the particle is difficult to be fixed precisely, the magnetic moment of the particle is difficult to be controlled, and the sensitivity quantitative calibration error of the detection equipment is large. (2) Background interference influence simulation, namely, certain substrate materials (such as lithium iron phosphate materials) have higher magnetic background, magnetic permeability and magnetic susceptibility of the substrate materials can generate nonlinear enhancement or shielding effect on impurity signals, and the conventional simulation device cannot simulate the coupling condition of the impurity signals and a high background environment, so that a large deviation exists between a laboratory calibration result and actual production line conditions. (3) The traditional liquid or powder-based simulation device has complex structure, and the medium cannot simulate complex magnetic characteristics (such as magnetic circuit distortion caused by magnetic permeability mu) of industrial powder materials, so that the device cannot be directly applied to the calibration of industrial-grade low-abundance magnetic impurity detection equipment. (4) The cost and the flexibility are insufficient, the prior art is difficult to realize multi-layer and multi-position rapid switching to simulate different working conditions, the inversion verification requirement of an automatic detection line on defects with different depths cannot be met, and the research and development efficiency and the precision improvement of the detection equipment are limited. Therefore, a scheme which has a simple structure and low cost and can accurately simulate magnetic impurity signals with different depths and different intensities is needed to solve the problems of signal inversion verification and sensitivity calibration of the quantum detection equipment in the research and development process. Disclosure of Invention The invention aims to solve the technical problem of improving the simulation precision of magnetic impurities. The invention solves the technical problems through the following technical scheme: The magnetic impurity simulation method based on the current dipole comprises the following steps: Filling a sample container with base powder, embedding a multi-level current dipole array in the base powder, and respectively fixing the multi-level current dipole array at different depths inside the sample container; inputting simulation parameters of target magnetic impurity particles, calculating target driving current, introducing a medium correction coefficient to reversely correct the target driving current, and solving actual driving current; Applying an actual drive current to the current dipole array at a selected level to produce an analog magnetic field; And extracting an analog magnetic field signal based on a phase-locked amplification technology, and using the analog magnetic field signal for magnetic field signal inversion verification or sensitivity calibration. Further, the method further comprises: And selecting current dipole arrays of different levels to electrify through the multi-channel switching matrix so as to simulate the magnetic field attenuation characteristics under different burial depths. Further, the base powder is a non-magnetic powder or a base powder having a specific magnetic permeability. Further, the calculation target driving current is specifically: first, for spherical magnetic particles with radius R, the excited magnetic moment is solved : Wherein, the For diameter, the mathematical relationship d=2r is satisfied,For the magnetic suscep