To improve the dc magnetic field sensitivity of conventional inductor-type (i.e., longitudinally driven giant magnetoimpedance) sensor at the low excitation frequency, a transformer-type laminated magnetic sensor consisting of soft magnetostrictive alloy FeBSiC/piezoelectric ceramics Pb(Zr,Ti)O3/FeBSiC heterostructure wrapped with both the exciting and sensing coils (i.e., FPFCexCse) is proposed. Compared to the inductor-type dc magnetic sensor (i.e., Hac driven FeBSiC ribbons with only exciting coils), on one hand the ac magnetic field (Hac) produced by the exciting coil and the stress produced by electrically driven PZT are synchronously coupled to enhance the magnetic induction variation of FeBSiC and the induced voltage sensitivity of sensing coils. On the other hand the mutual inductance induced voltage eliminates the weak skin effect at the low excitation frequency. When the exciting coil and PZT of FPFCexCse laminate are synchronously excited with 5 mA ac current and 5 V voltage at the mechanical resonance frequency, the maximum magnetic field sensitivity of 21200 V/T is achieved. This is about 4.08 times and 2.98 times as high as that of FeBSiC ribbon with only exciting coils (5190 V/T) and FeBSiC ribbons with both exciting and sensing coils (7120 V/T), respectively. Furthermore the equivalent magnetic noise of 114 pT/Hz−−−√114~{\mathrm {pT}}/\sqrt {{\mathrm {Hz}}} (at 1Hz) is achieved by the FPFC exCse laminate, which is obviously lower than that of Hac driven FeBSiC ribbons.

中文翻译：

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耦合交流磁场和应力驱动软磁层压异质结构的增强直流磁场灵敏度


为了提高传统电感式（即纵向驱动巨磁阻抗）传感器在低激励频率下的直流磁场灵敏度，提出一种由软磁致伸缩合金FeBSiC/压电陶瓷Pb(Zr,Ti)O3组成的变压器式叠层磁传感器。提出了包裹有激励线圈和传感线圈的/FeBSiC异质结构（即FPFCexCse）。与电感式直流磁传感器（即仅具有励磁线圈的 Hac 驱动 FeBSiC 带）相比，一方面，励磁线圈产生的交流磁场 (Hac) 与电驱动 PZT 产生的应力同步耦合，以增强FeBSiC 的磁感应强度变化和传感线圈的感应电压灵敏度。另一方面，互感感应电压消除了低激励频率下的弱集肤效应。当FPFCexCse层压板的励磁线圈和PZT在机械谐振频率下用5 mA交流电流和5 V电压同步励磁时，可实现21200 V/T的最大磁场灵敏度。这分别是仅具有励磁线圈的 FeBSiC 焊带 (5190 V/T) 和具有励磁和感应线圈 (7120 V/T) 的 FeBSiC 焊带的 4.08 倍和 2.98 倍。此外，FPFC exCse 层压板实现了 114 pT/Hz−−−√114~{\mathrm {pT}}/\sqrt {{\mathrm {Hz}}}（1Hz 时）的等效磁噪声，这显然是低于 Hac 驱动的 FeBSiC 带材。