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An active-passive magnetic shielding method

A magnetic shielding, active and passive technology, applied in the field of gyro, can solve the problem that the magnetic shielding method is difficult to meet the high-efficiency shielding requirements, and achieve the effect of improving the magnetic shielding performance, accuracy and bandwidth

Active Publication Date: 2016-05-18
BEIJING AUTOMATION CONTROL EQUIP INST
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Problems solved by technology

[0005] The technical problem to be solved in the present invention is: the existing magnetic shielding method is difficult to meet the requirements of the current small-volume nuclear magnetic resonance gyroscope for efficient shielding of the environmental magnetic field

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Embodiment Construction

[0023] An active and passive magnetic shielding method of the present invention will be described in detail below with reference to the drawings and embodiments.

[0024] An active and passive magnetic shielding method, comprising the following steps:

[0025] 1) passive shielding, a passive shielding layer 1 is set outside the nuclear magnetic resonance gyroscope, and the passive shielding layer 1 is as figure 1 As shown, it has a cylindrical shape and has three layers in total. It uses 1J85 material or other high-permeability materials with high permeability coefficient to attenuate the ambient magnetic field. The three passive shielding layers 1 have a common centroid, and non-magnetic materials are used to fill or support between adjacent two layers.

[0026] The passive shielding layer 1 can also be in the shape of a hollow spherical or square tube, and the number of layers can be two.

[0027] 2) active compensation, outside the nuclear magnetic resonance gyroscope, an...

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Abstract

The invention belongs to the technical field of gyroscopes and relates to a magnetic shielding method used for a magnetic resonance gyroscope. The active-passive magnetic shielding method includes 1) a step of passive shielding, namely a step of setting a passive shielding layer at the outside of the magnetic resonance gyroscope, with the shielding layer being a high-magnetic-permeability material, and 2) a step of active compensation, namely a step of setting an active compensation device inside a passive shielding device and outside a sensitive structure of the magnetic resonance gyroscope, wherein the active compensation device comprises an atom magnetometer, a three-dimensional magnetic field coil and a current source. The technical problem to be overcome is a problem that magnetic shielding methods at present cannot meet efficient environment magnetic field shielding requirements for small-size magnetic resonance gyroscopes. The method improves magnetic shielding performance on the base of not increasing hardware components of the magnetic resonance gyroscope.

Description

technical field [0001] The invention belongs to the technical field of gyroscopes, and in particular relates to a magnetic shielding method for nuclear magnetic resonance gyroscopes. Background technique [0002] In the past ten years, with the development of quantum control technology, the atomic gyroscope has developed rapidly and has become an important development direction of the next generation gyroscope. NMR gyroscopes belong to the class of atomic gyroscopes, which measure angular motion based on the invariance of the magnetic resonance frequency of nuclear spins in inertial space. The gyroscope has the characteristics of outstanding high precision, small size, pure solid state, and insensitivity to acceleration, etc., which represents the development direction of high-precision, small-sized gyroscopes in the future. [0003] When the NMR gyro is working, the angular motion will cause the observed NMR frequency to change, but at the same time the magnetic field will...

Claims

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Application Information

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IPC IPC(8): G01C19/60
Inventor 郑辛秦杰汪世林杨磊高溥泽韩文法王宇虹孙晓光
Owner BEIJING AUTOMATION CONTROL EQUIP INST
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