100 Hz~1 MHz感应式磁传感器的低噪声前置放大电路设计
Low Noise Amplifier Design for 100 Hz~1 MHz Induction Magnetometers
DOI: 10.12677/JSTA.2023.113024, PDF,   
作者: 唐 尧, 晏茂珊：中南大学地球科学与信息物理学院，湖南 长沙；中南大学有色金属成矿预测教育部重点实验室，湖南 长沙
关键词: 大地电磁法勘探；感应式磁传感器；低噪声；前置放大电路； Magnetotelluric Methods； Induction Magnetometers； Low Noise； Amplifier
摘要: 感应式磁传感器常用于大地电磁法勘探中，降低感应式磁传感器的噪声水平可改善采集的磁场数据信噪比，进而提高大地电磁法的勘探精度。本文从感应式磁传感器的原理出发，分析了感应式磁传感器的噪声源分布，采用低噪声JFET (JFE2140)和高速集成运算放大器(OPA211)设计并制作了一款低噪声前置放大电路，该前置放大电路的电压噪声为1.8 nV/√Hz@100kHz，电流噪声为2.9 fA/√Hz@100kHz，固定增益为60 dB，带宽为30 Hz~500 kHz。测量结果表明，该低噪声前置放大电路适用于100 Hz~1 MHz感应式磁传感器中的微弱磁场信号放大。
Abstract: Induction Magnetometers (IM) are commonly used in geomagnetic exploration. Reducing the noise of Induction Magnetometers can improve the signal-to-noise ratio of the collected magnetic field data, which in turn can improve the exploration accuracy of geomagnetic exploration. In this paper, the noise source distribution of IM is analyzed. A low-noise JFET (JFE2140) and a high- speed integrated operational amplifier (OPA211) were used to design and fabricate a low-noise amplifier with a voltage noise of 1.8 nV/√Hz@100kHz and a current noise of 2.9 fA/√Hz@100kHz, a fixed gain of 60 dB and a bandwidth of 30 Hz~500 kHz. The measurement results show that this low-noise amplifier is suitable for am-plifying weak magnetic field signals in 100 Hz~1 MHz Induction Magnetometers.
文章引用：唐尧, 晏茂珊. 100 Hz~1 MHz感应式磁传感器的低噪声前置放大电路设计[J]. 传感器技术与应用, 2023, 11(3): 222-231. https://doi.org/10.12677/JSTA.2023.113024

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