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Proceedings Paper

Design and implementation of JOM-3 Overhauser magnetometer analog circuit
Author(s): Xiao Zhang; Xue Jiang; Jianchang Zhao; Shuang Zhang; Xin Guo; Tingting Zhou
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Paper Abstract

Overhauser magnetometer, a kind of static-magnetic measurement system based on the Overhauser effect, has been widely used in archaeological exploration, mineral resources exploration, oil and gas basin structure detection, prediction of engineering exploration environment, earthquakes and volcanic eruotions, object magnetic measurement and underground buried booty exploration. Overhauser magnetometer plays an important role in the application of magnetic field measurement for its characteristics of small size, low power consumption and high sensitivity. This paper researches the design and the application of the analog circuit of JOM-3 Overhauser magnetometer. First, the Larmor signal output by the probe is very weak. In order to obtain the signal with high signal to noise rstio(SNR), the design of pre-amplifier circuit is the key to improve the quality of the system signal. Second, in this paper, the effectual step which could improve the frequency characters of bandpass filter amplifier circuit were put forward, and theoretical analysis was made for it. Third, the shaping circuit shapes the amplified sine signal into a square wave signal which is suitable for detecting the rising edge. Fourth, this design elaborated the optimized choice of tuning circuit, so the measurement range of the magnetic field can be covered. Last, integrated analog circuit testing system was formed to detect waveform of each module. By calculating the standard deviation, the sensitivity of the improved Overhauser magnetometer is 0.047nT for Earth’s magnetic field observation. Experimental results show that the new magnetometer is sensitive to earth field measurement.

Paper Details

Date Published: 5 September 2017
PDF: 10 pages
Proc. SPIE 10402, Earth Observing Systems XXII, 104022D (5 September 2017); doi: 10.1117/12.2271728
Show Author Affiliations
Xiao Zhang, Jilin Univ. (China)
Xue Jiang, Jilin Univ. (China)
Jianchang Zhao, Jilin Univ. (China)
Shuang Zhang, Jilin Univ. (China)
Xin Guo, Jilin Univ. (China)
Tingting Zhou, Jilin Univ. (China)

Published in SPIE Proceedings Vol. 10402:
Earth Observing Systems XXII
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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