부산대학교 도서관

• A new type of high-conductivity layer structure is proposed for magnetic shielding devices. • The AC magnetic shielding factor of magnetic shielding device for SERF magnetometer is improved. • Modified the theoretical calculation method for AC magnetic shielding factor and improved the accuracy of the results. • Promote the performance improvement and application of ultra-high sensitivity atomic sensors. Since the frequency of the biological magnetic field is DC to 500 Hz, it is important to improve the ability of the magnetic shielding device within this range for the measurement of the biological magnetic field and the reduction of the magnetic noise of the SERF magnetometer. At present, the optimization of AC magnetic field shielding in the frequency range of 0.01 to 500 Hz is rarely considered. To optimize the AC shielding factor, this paper analyzed the influence of the position and structure of the high-conductive layer in the magnetic shielding device and proposed an optimized structure of the high conductive layer. What's more, the theoretical formula was improved by introducing frequency coefficients, solving the problem of significant differences between theoretical calculation results, FEM results and measurement results. Finally, it was verified by experiments that the optimized high-conductivity layer structure can improve the AC shielding factor of magnetic shielding device. [ABSTRACT FROM AUTHOR]