A dumbbell-shaped hybrid magnetometer operating in DC-10 kHz

作者：Shi, Hongyu; Wang, Yanzhang^*; Chen, Siyu; Lin, Jun

来源：Review of Scientific Instruments, 2017, 88(12): 125001.

DOI：10.1063/1.5013015

• FLUXGATE
• SENSORS

This study is motivated by the need to design a hybrid magnetometer operating in a wide-frequency band from DC to 10 kHz. To achieve this objective, a residence times difference fluxgate magnetometer (RTDFM) and an induction magnetometer (IM) have been integrated into a compact form. The hybrid magnetometer has a dumbbell-shaped structure in which the RTDFM transducer is partially inserted into the tube cores of the IM. Thus, the sensitivity of the RTDFM is significantly improved due to the flux amplification. The optimal structure, which has maximum sensitivity enhancement, was obtained through FEM analysis. To validate the theoretical analysis, the optimal hybrid magnetometer was manufactured, and its performance was evaluated. The device has a sensitivity of 45 mV/nT at 1 kHz in IM mode and 0.38 mu s/nT in RTDFM mode, which is approximately 3.45 times as large as that of the single RTDFM structure. Furthermore, to obtain a lower noise performance in the entire frequency band, two operation modes switch at the cross frequency (0.16 Hz) of their noise levels. The noise level is 30 pT/root Hz in RTDFM mode and 0.07 pT/root Hz at 1 kHz in IM mode. Published by AIP Publishing.

• 出版日期2017-12
• 单位吉林大学