低频感应磁力计的低噪声斩波放大器设计

IF 1.6 3区地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS

Journal of Geophysics and Engineering Pub Date : 2023-10-18 DOI:10.1093/jge/gxad082

Yao Tang, Zhenzhu Xi, Xingpeng Chen, Xia Long

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引用次数: 0

摘要

感应磁力计(IM)是大地电磁法勘探中常用的一种仪器。前置放大器低频段的1/f噪声降低了IM的信噪比，影响了勘探结果。设计了一种低噪声斩波放大器，其等效输入电压噪声在1mhz时为9.8 nV/√Hz，在0.01 Hz时为2.1 nV/√Hz，在0.1 Hz时为1.9 nV/√Hz, 1/f噪声角频率为8 mHz，等效输入电流噪声在1mhz时为200 fA/√Hz，在0.01 Hz时为100 fA/√Hz，在0.1 Hz时为60 fA/√Hz。使用这种斩波放大器的IM长85.5厘米，直径6.0厘米，总重量为4.8公斤。在20hz和1khz时灵敏度为300mv /nT, 1hz时理论等效输入磁场噪声为0.3 pT/√Hz，测量频率范围为1mhz ~ 1khz。

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Low noise chopper amplifier design for low frequency Induction Magnetometers

Abstract Induction Magnetometers (IM) are commonly used in Magnetotelluric Method for exploration. 1/f noise in the low frequency band of the preamplifier reduce the signal-to-noise ratio of IM, thus affecting the exploration results. We designed a low noise chopper amplifier with equivalent input voltage noise of 9.8 nV/√Hz at 1 mHz, 2.1 nV/√Hz at 0.01 Hz, 1.9 nV/√Hz at 0.1 Hz, 1/f noise corner frequency of 8 mHz, and equivalent input current noise of 200 fA/√Hz at 1 mHz, 100 fA/√Hz at 0.01 Hz, 60 fA/√Hz at 0.1 Hz. The IM using this chopper amplifier is 85.5 cm long, 6.0 cm in diameter and has a total weight of 4.8 kg. Its sensitivity is 300 mV/nT during 20 Hz and 1 kHz, with a theoretical equivalent input magnetic field noise of 0.3 pT/√Hz at 1 Hz and a measurement frequency range of 1 mHz to 1 kHz.

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来源期刊

Journal of Geophysics and Engineering 工程技术-地球化学与地球物理

CiteScore

2.50

自引率

21.40%

发文量

审稿时长

4 months

期刊介绍： Journal of Geophysics and Engineering aims to promote research and developments in geophysics and related areas of engineering. It has a predominantly applied science and engineering focus, but solicits and accepts high-quality contributions in all earth-physics disciplines, including geodynamics, natural and controlled-source seismology, oil, gas and mineral exploration, petrophysics and reservoir geophysics. The journal covers those aspects of engineering that are closely related to geophysics, or on the targets and problems that geophysics addresses. Typically, this is engineering focused on the subsurface, particularly petroleum engineering, rock mechanics, geophysical software engineering, drilling technology, remote sensing, instrumentation and sensor design.