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Proceedings Paper

An improved proton magnetometer for Earth's magnetic field observation
Author(s): Chengyu Xiao; Shuang Zhang; Xin Guo; Haoyang Fu
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Paper Abstract

As a precision instrument to measure the earth magnetic field, proton magnetometer is widely used in different fields such as geological survey, buried objects detection and earth field variations. Due to poor signal to noise ratio (SNR) of the system, proton magnetometer suffers from low sensitivity which directly affects the performance. In order to increase the sensitivity, we present an improved proton magnetometer. First, the effect of matching resistance on Q value is discussed to enhance SNR, and high matching resistance has been chosen to improve the Q value of the resonant circuit. Second, noise induced by pre-amplifier is investigated in order to obtain low noise signal, and we adopt the JFET with noise figure less than 0.5dB as the pre-amplifier. Third, by using band-pass filter, low-noise output signal is obtained. Fourth, the method of period measurement based on CPLD is employed to measure frequency of the square wave shaped from the output sinusoidal signal. High precision temperature compensate crystal oscillator (TCXO) has been used to improve the frequency measurement accuracy. Last, experimental data is obtained through field measurements. By calculating the standard deviation, the sensitivity of the improved proton magnetometer is 0.15nT for Earth’s magnetic field observation. Experimental results show that the new magnetometer is sensitive to earth field measurement.

Paper Details

Date Published: 8 September 2015
PDF: 9 pages
Proc. SPIE 9607, Earth Observing Systems XX, 960729 (8 September 2015); doi: 10.1117/12.2187385
Show Author Affiliations
Chengyu Xiao, Jilin Univ. (China)
Shuang Zhang, Jilin Univ. (China)
Xin Guo, Jilin Univ. (China)
Haoyang Fu, Jilin Univ. (China)


Published in SPIE Proceedings Vol. 9607:
Earth Observing Systems XX
James J. Butler; Xiaoxiong (Jack) Xiong; Xingfa Gu, Editor(s)

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