低频高性能屏蔽装置的设计

Design of shielding device with low-frequency and high-performance

摘要:

为了合理评估磁屏蔽体对低频磁场的屏蔽效果，设计了一种磁屏蔽体并提出一种屏蔽方案，计算静磁场与交变磁场共同影响下，其屏蔽装置对其屏蔽性能的影响，并通过实验来论证该屏蔽体和设计方案在实践中的应用可行性。实验结果表明，设计的电磁屏蔽室，室内静磁场B≤200 nT，50 Hz交流磁场干扰<0.10 μT；大于100 kHz交流磁场屏蔽系数S≥1 000；满足磁传感器系统等相关仪器的实用要求，为实践屏蔽室屏效验收提供理论依据。

Abstract:

A magnetic shielding room is designed in order to evaluate the magnetic shielding effect on low-frequency magnetic fields. A kind of shielding scheme is proposed，in which the shielding effect is studied under the joint influence of static magnetic field and alternating magnetic field. The experimental results show that for the proposed electromagnetic shielding room, indoor static magnetic field B≤200 nT，50 Hz AC magnetic interference<0.10 μT，greater than 100 kHz AC magnetic shielding factor S≥1 000，which meets the practical requirements of the magnetic sensor system. This work can provide a necessary theoretical basis for the shielding effect evaluation of shielding room.