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Composite environmental disturbance magnetic field shielding system

A technology of environmental interference and shielding system, applied in the direction of magnetic field/electric field shielding, size/direction of magnetic field, electromagnet, etc., can solve the problems of large magnetic field noise, low shielding coefficient, and difficult to meet the overall index, so as to improve shielding efficiency, The effect of reducing residual magnetism

Active Publication Date: 2020-04-03
中国船舶重工集团有限公司第七一0研究所
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Problems solved by technology

[0006] However, the internal remanence of traditional magnetic shielding chambers based on multilayer silicon steel sheets and permalloys and other magnetic materials is generally tens of nants, and the shielding coefficient is low in low frequency bands, the magnetic field noise is large, and the overall construction cost is very high. The overall indicators are difficult to meet the above requirements
Although the cost of the active magnetic shielding system is low, it has a very good shielding factor in the low frequency band and is complementary to the shielding room, but it can only shield the uniform interference magnetic field in the space domain, and cannot solve the non-uniform stray interference magnetic field

Method used

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  • Composite environmental disturbance magnetic field shielding system
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  • Composite environmental disturbance magnetic field shielding system

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Embodiment Construction

[0031] The present invention will be described in detail below with reference to the accompanying drawings and examples.

[0032] This embodiment provides a composite environmental disturbance magnetic field shielding system, including a magnetic shielding room 1 based on multilayer magnetically permeable materials, an active compensating device for fluctuating magnetic fields, and an active compensating device for geomagnetism.

[0033] Such as figure 1 As shown, the magnetically shielded room 1 based on multilayer magnetically permeable materials includes a main frame, a magnetically shielded plate, a degaussing cable, and a degaussing power supply. The magnetic shielding room 1 is provided with a magnetic shielding door 2 for operators to enter and exit. The direction of opening the door is the X direction, that is, the X direction is perpendicular to the wall where the door is located.

[0034] The main frame is a multi-layer structure, using three-layer aluminum alloy sk...

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Abstract

The invention discloses a combined environmental disturbance magnetic field shielding system. The system comprises a magnetic shielding chamber based on multiple layers of magnetic conductive materials, a fluctuating magnetic field active compensation device and a geomagnetic active compensation device. The fluctuating magnetic field active compensation device is installed on the outer side of themagnetic shielding chamber based on the multiple layers of magnetic conductive materials, and the geomagnetic active compensation device is installed on the outer side of the magnetic shielding chamber based on the multiple layers of magnetic conductive materials and shares a coil framework with the fluctuating magnetic field active compensation device. The fluctuating magnetic field active compensation device outputs a compensation magnetic field with the same size and opposite direction as the fluctuating magnetic field in the environment interference magnetic field, and the geomagnetic active compensation device is used for compensating the geomagnetic field. According to the invention, a non-uniform stray interference magnetic field can be solved, and the shielding efficiency is improved.

Description

technical field [0001] The invention belongs to the field of electromagnetic fields, and in particular relates to a composite environment interference magnetic field shielding system. Background technique [0002] Environmental interference magnetic field mainly refers to the interference magnetic field generated by magnetic objects such as geomagnetism, automobiles, subways, trains, elevators, motors, transformers, etc., as well as the 50Hz / 60Hz power frequency magnetic field and power frequency harmonic interference magnetic field generated by power cables. [0003] For the development and testing of superconducting quantum magnetometers (SQUID), induction magnetometers, alkali metal atom SERF magnetometers and other magnetometers with ultra-high sensitivity, a magnetic shield device with a very high magnetic shielding coefficient is required to generate an extremely weak magnetic field environment , but subject to the current level of magnetic shielding room, the current ...

Claims

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Application Information

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IPC IPC(8): H05K9/00H01F7/18G01R33/02
CPCG01R33/0206H01F7/18H05K9/0001
Inventor 张海波周昌剑赵文纯窦珂
Owner 中国船舶重工集团有限公司第七一0研究所
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