Design and development of magnetic shielding for micro nuclear magnetic resonance gyroscope
Magnetic shielding can be used to eliminate the influence of the temporal and spatial changing exterior magnetic field on the working field of Nuclear Magnetic Resonance Gyroscope(NMRG).It is essential to develop the magnetic shielding for NMRG.For the design of small volume magnetic shielding,the influence of the holes and discontinuous gaps cannot be ignored.Therefore,this article studied the magnetic circuit method and finite element method for calculating the shielding effectiveness of multi-hole discontinuity magnetic shielding.Combining the analytical method,magnetic circuit method and finite element method,this paper proposed the design method of the high-efficiency multi-hole and small-size magnetic shielding.The analytical method is used to determine the outline size,the connection mode is determined based on the magnetic circuit method,and the fine size of the gap is determined by the finite element method,which can be beneficial to obtain the accurate design accuracy with high efficiency.Based on this method,the 50 cubic centimeter(cc)magnetic shielding was developed and tested.Experiment results show that the shielding effectiveness of the 50cc magnetic shielding is better than 104.The experimental result is consistent with the design method,which verifies the effectiveness of the proposed design method.
nuclear magnetic resonance gyroscopemagnetic shieldingshielding effectivenessoptimization design
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