Magnetic shielding method and system for extremely weak magnetic field instrument

Abstract

The invention discloses a magnetic shielding method and system for an extremely weak magnetic field instrument. The system comprises an environment magnetic field sensing module, an active shielding module, a passive shielding module, a cooperative control module and a feedback optimization module. The environment magnetic field sensing module acquires environment magnetic field disturbance information of a to-be-shielded area in real time, and the active shielding module generates and outputs a compensation magnetic field dynamically matched with a disturbance vector; the passive shielding module is a composite shielding cavity surrounding a shielding area and carries out basic attenuation on a static and low-frequency magnetic field, and the cooperative control module is coupled with the environment magnetic field sensing module, the active shielding module and the passive shielding module and regulates and controls the space-time cooperative relation between active compensation and passive attenuation; the feedback optimization module collects shielding environment feedback signals and drives closed-loop iterative optimization of a compensation strategy. Compared with the prior art, the magnetic shielding method and system for the extremely weak magnetic field instrument have the advantages that full-band coverage and dynamic adaptability are considered through dynamic coupling of active compensation and passive attenuation.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of precise magnetic measurement, in particular to a method and system for magnetic shielding of an extremely weak magnetic field instrument. BACKGROUND

[0002] The extremely weak magnetic field instrument is extremely sensitive to the magnetic field environment, and needs to be shielded from the geomagnetic field, power frequency and the like to realize high-resolution measurement.

[0003] Traditional magnetic shielding relies on passive shielding, which can attenuate static / low-frequency magnetic fields, but the response to dynamic disturbances such as device start / stop and personnel movement is lagging, and the shielding efficiency of the high-frequency band is limited.

[0004] Active shielding generates a reverse magnetic field through an electromagnetic coil, but the traditional scheme is mostly open-loop control, which is difficult to match the time-varying characteristics of complex disturbances, and is prone to over-compensation or under-compensation.

[0005] Therefore, the single shielding mode cannot take into account full-band coverage and dynamic adaptability, resulting in residual magnetic fields after shielding that still affect the measurement accuracy. SUMMARY

[0006] The technical problem to be solved by the application is to overcome the above technical defects, and to provide a method and system for magnetic shielding of an extremely weak magnetic field instrument through dynamic coupling of active compensation and passive attenuation.

[0007] To solve the above technical problems, the technical scheme provided by the application is as follows: a method for magnetic shielding of an extremely weak magnetic field instrument, comprising the following steps: S1: acquiring environmental magnetic field disturbance information of a region to be shielded in real time; S2: based on the environmental magnetic field disturbance information, dynamically generating a compensation magnetic field control instruction opposite in direction and adaptive in strength to the disturbance vector; S3: driving a space-orthogonal configured active shielding unit according to the control instruction to output a dynamic compensation magnetic field; S4: synchronously enabling a multi-layer passive shielding structure surrounding the region to be shielded to implement gradient attenuation on static and low-frequency background magnetic fields; S5: time-sequentially and spatially cooperatively integrating the dynamic compensation magnetic field and the attenuation effect of the passive shielding structure to construct a dynamically adaptive comprehensive magnetic shielding environment in the sensitive region of the extremely weak magnetic field instrument; and S6: continuously collecting shielding effectiveness feedback signals and iteratively optimizing the compensation strategy in real time based on the feedback results to complete closed-loop adaptive regulation and control of the shielding process.

[0008] Preferably, the distributed magnetic field sensing network in S1 synchronously acquires the spatial distribution and dynamic evolution characteristics of three-dimensional magnetic field disturbances through the spatial arrayed multi-axial sensing units.

[0009] Preferably, the dynamic characteristic analysis in S2 includes frequency spectrum component identification and vector direction decomposition of the disturbance information to determine the time and space regulation basis of the compensation magnetic field.

[0010] Preferably, the active shielding unit in S3 independently regulates the magnetic field components of each spatial direction according to the control instruction, realizes the vector accurate synthesis and dynamic tracking of the compensation magnetic field.

[0011] Preferably, the feedback optimization in S6 is based on the stability index of the extremely weak magnetic field instrument working signal, dynamically adjusts the response time sequence and spatial action range of the compensation strategy.

[0012] Another aspect of the present application discloses an extremely weak magnetic field instrument magnetic shielding system comprising an environmental magnetic field sensing module, an active shielding module, a passive shielding module, a cooperative control module and a feedback optimization module. The environmental magnetic field sensing module obtains the environmental magnetic field disturbance information of the shielding area in real time, and the active shielding module generates and outputs the compensation magnetic field dynamically matched with the disturbance vector. The passive shielding module is a composite shielding cavity surrounding the shielding area, which implements basic attenuation of static and low-frequency magnetic fields, and the cooperative control module is coupled with the environmental magnetic field sensing module, the active shielding module and the passive shielding module respectively, to regulate the spatiotemporal cooperation relationship of active compensation and passive attenuation. The feedback optimization module collects shielding environment feedback signals and drives the closed-loop iterative optimization of the compensation strategy.

[0013] Preferably, the environmental magnetic field sensing module comprises a three-dimensional orthogonal magnetic field sensing array, which synchronously senses the disturbance components and their time-varying characteristics in each direction of space.

[0014] Preferably, the active shielding module comprises a plurality of groups of spatially distributed electromagnetic execution units, each unit independently generates a directional compensation magnetic field according to the vector component requirement.

[0015] Preferably, the passive shielding module is a nested multi-layer shielding shell structure, and each layer of shielding body cooperatively completes the stepwise attenuation of wide-band magnetic field interference according to the difference in magnetic characteristics.

[0016] Preferably, the feedback optimization module integrates adaptive control logic, predicts the environmental change trend based on historical disturbance patterns, and adjusts the compensation parameters in advance.

[0017] Compared with the prior art, the present application has the following advantages: The present application breaks through the bottleneck of single shielding mode, synchronously improves the static field attenuation and dynamic disturbance suppression capability, and eliminates the action blind area of active and passive units based on the spatiotemporal cooperation mechanism. The feedback optimization module in the present application incorporates the shielding result into the regulation loop, enhances the environmental mutation resistance of the system, and is easy to use and promote. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is a flowchart of the magnetic shielding method of the extremely weak magnetic field instrument. DETAILED DESCRIPTION

[0019] The present invention will now be described in further detail with reference to the accompanying drawings.

[0020] Combined with appendix Figure 1 As shown, a magnetic shielding system for an extremely weak magnetic field instrument includes an environmental magnetic field sensing module, an active shielding module, a passive shielding module, a collaborative control module, and a feedback optimization module. The environmental magnetic field sensing module acquires real-time environmental magnetic field disturbance information of the area to be shielded. The active shielding module generates and outputs a compensation magnetic field that dynamically matches the disturbance vector. The passive shielding module is a composite shielding cavity surrounding the shielding area, which performs basic attenuation on static and low-frequency magnetic fields. The collaborative control module couples the environmental magnetic field sensing module, the active shielding module, and the passive shielding module respectively, and regulates the spatiotemporal collaborative relationship between active compensation and passive attenuation. The feedback optimization module collects feedback signals from the shielding environment and drives closed-loop iterative optimization of the compensation strategy.

[0021] After the system starts up, the modules work together in sequence. The environmental magnetic field sensing module consists of a distributed magnetic field sensing network composed of multi-axial sensing units arranged in a spatial array. Multiple triaxial magnetic sensors are deployed in a three-dimensional orthogonal topology at the boundary of the shielded area and key internal nodes, synchronously collecting X / Y / Z omnidirectional magnetic field data streams. This not only captures the spatial distribution of disturbance information in real time, but also accurately tracks its dynamic evolution characteristics. The arrayed sensing effectively eliminates spatial blind spots and significantly improves the completeness of disturbance identification and anti-interference robustness. After receiving the sensing data, the collaborative control module performs dynamic feature analysis. First, it identifies the spectral components of the disturbance information, and then completes the vector direction decomposition. Based on the analysis results, the module generates compensation magnetic field control commands. The instructions clearly include the compensation intensity, phase and timing of each direction, ensuring that the output magnetic field is strictly opposite to the disturbance vector and that the intensity is dynamically matched, thus avoiding energy waste or secondary interference caused by blind compensation. The active shielding module contains multiple spatially distributed electromagnetic actuators configured strictly along the X / Y / Z orthogonal axes. Each unit independently receives control commands and precisely regulates the output of the magnetic field components in the corresponding direction. Through vector superposition, it achieves full-domain precise synthesis and millisecond-level dynamic tracking of the compensation magnetic field. This allows the system to perform quantization analysis and directional cancellation for complex disturbances, completely overcoming the vector error defects of traditional single-axis compensation. At the same time, the spatially distributed layout ensures the uniformity of the compensation field within the shielding area and eliminates the risk of local overcompensation. The passive shielding module is constructed as a nested multi-layer shielding shell structure surrounding the area to be shielded. Each layer of shielding works in concert based on the differences in magnetic properties to implement a step-gradient attenuation of static and low-frequency background magnetic fields, thereby improving the ability to suppress static backgrounds such as the geomagnetic field. In use, the collaborative control module coordinates the spatiotemporal synergy between active compensation and passive attenuation. In the time dimension, it dynamically allocates the weights of active and passive units based on the disturbance frequency. In the spatial dimension, it optimizes the distribution strategy of the compensation field by combining sensor network data to ensure balanced shielding effectiveness across the entire sensitive area. Through the above collaborative mechanism, the advantages of active and passive shielding complement each other. The passive structure bears the basic attenuation load to reduce the power consumption of the active unit, while the active unit focuses on dynamic disturbance suppression to compensate for the lag in the response of the passive structure.

[0022] The feedback optimization module continuously collects shielding effectiveness feedback signals. The signal sources include environmental residual disturbance data and stability indicators of the working signals of the extremely weak magnetic field instrument. Based on the stability indicators, the module dynamically adjusts the response timing and spatial range of the compensation strategy. Through integrated adaptive control logic, it analyzes historical disturbance patterns, predicts environmental change trends, and pre-adjusts compensation parameters to effectively suppress transient fluctuations during the shielding process, ensuring the long-term stability and repeatability of the measurement data.

[0023] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the spirit of the invention, such designs should fall within the protection scope of the present invention.

Claims

1. A magnetic shielding method for an extremely weak magnetic field instrument, characterized in that: Includes the following steps: S1: Real-time acquisition of environmental magnetic field disturbance information in the area to be shielded; S2: Based on environmental magnetic field disturbance information, dynamically generate compensation magnetic field control commands that are opposite in direction and adapted in intensity to the disturbance vector. S3: Drives the spatially orthogonally configured active shielding unit according to control commands, and outputs a dynamic compensation magnetic field; S4: Simultaneously activate the multi-layer passive shielding structure surrounding the area to be shielded to implement gradient attenuation of static and low-frequency background magnetic fields; S5: The dynamic compensation magnetic field and the attenuation effect of the passive shielding structure are integrated in a temporal and spatial manner to construct a dynamic and adaptive comprehensive magnetic shielding environment in the sensitive area of ​​the extremely weak magnetic field instrument. S6: Continuously collect shielding effectiveness feedback signals and iteratively optimize compensation strategies in real time based on the feedback results to complete closed-loop adaptive control of the shielding process.

2. The magnetic shielding method for an extremely weak magnetic field instrument according to claim 1, characterized in that: The distributed magnetic field sensing network in S1 acquires the spatial distribution and dynamic evolution characteristics of three-dimensional magnetic field disturbances simultaneously through multi-axial sensing units arranged in a spatial array.

3. The magnetic shielding method for an extremely weak magnetic field instrument according to claim 1, characterized in that: The dynamic feature analysis in S2 includes identifying the spectral components and decomposing the vector direction of the disturbance information to determine the basis for the time-space control of the compensation magnetic field.

4. The magnetic shielding method for an extremely weak magnetic field instrument according to claim 1, characterized in that: The active shielding unit in S3 independently adjusts the magnetic field components in each spatial direction according to the control command, so as to realize the vector accurate synthesis and dynamic tracking of the compensation magnetic field.

5. The magnetic shielding method for an extremely weak magnetic field instrument according to claim 1, characterized in that: The feedback optimization in S6 is based on the stability index of the working signal of the extremely weak magnetic field instrument, and dynamically adjusts the response timing and spatial range of the compensation strategy.

6. A magnetic shielding system for an extremely weak magnetic field instrument, used to perform the method as described in any one of claims 1-5, characterized in that: It includes an environmental magnetic field sensing module, an active shielding module, a passive shielding module, a collaborative control module, and a feedback optimization module; The environmental magnetic field sensing module acquires environmental magnetic field disturbance information of the area to be shielded in real time, and the active shielding module generates and outputs a compensation magnetic field that dynamically matches the disturbance vector. The passive shielding module is a composite shielding cavity surrounding the shielding area, which performs basic attenuation of static and low-frequency magnetic fields. The collaborative control module is coupled to the environmental magnetic field sensing module, the active shielding module and the passive shielding module respectively, and regulates the spatiotemporal coordination relationship between active compensation and passive attenuation. The feedback optimization module collects feedback signals from the shielded environment and drives the closed-loop iterative optimization of the compensation strategy.

7. The magnetic shielding system for an extremely weak magnetic field instrument according to claim 6, characterized in that: The environmental magnetic field sensing module includes a three-dimensional orthogonally arranged magnetic field sensing array that synchronously senses spatial disturbance components and their time-varying characteristics.

8. The magnetic shielding system for an extremely weak magnetic field instrument according to claim 6, characterized in that: The active shielding module includes multiple spatially distributed electromagnetic actuators, each of which independently generates a directional compensation magnetic field according to the vector component requirements.

9. The magnetic shielding system for an extremely weak magnetic field instrument according to claim 6, characterized in that: The passive shielding module is a nested multi-layer shielding shell structure, in which each layer of shielding works together to achieve a step-by-step attenuation of wideband magnetic field interference based on the differences in magnetic properties.

10. The magnetic shielding system for an extremely weak magnetic field instrument according to claim 6, characterized in that: The feedback optimization module integrates adaptive control logic, predicts environmental change trends based on historical disturbance patterns, and adjusts compensation parameters in advance.

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