Ultralow Noise Preamplifier and Optimization Method for Induction Magnetometers

被引：14
|
作者：
Liu, Kai [1 ,2 ]
Zhu, Wanhua [1 ,2 ]
Yan, Bin [1 ,2 ]
Liu, Leisong [1 ,2 ]
Fang, Guangyou [1 ]
机构：
[1] Chinese Acad Sci, Key Lab Electromagnet Radiat & Sensing Technol, Beijing 100089, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100190, Peoples R China
来源：
IEEE SENSORS JOURNAL | 2015年 / 15卷 / 06期
基金：
中国国家自然科学基金;
关键词：
JFETs; ultralow noise preamplifier; offset compensation; noise measurement; optimization method; induction magnetometer; SEARCH COIL MAGNETOMETER; SENSORS;
D O I：
10.1109/JSEN.2015.2389336
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
A 2 nV/root Hz and 10 fA/root Hz at 1-Hz ultralow noise preamplifier is designed to improve the sensitivity of the induction magnetometer (IM) from 0.1 Hz to 10 kHz. Meanwhile, the noise characteristics of IM are analyzed and distinguished. A novel optimization method to find the minimum length of the core under the required noise level and the limited IM weight is proposed. Furthermore, an optimal IM prototype from 0.1 Hz to 10 kHz is developed with the noise level of 1 pT/root Hz at 1 Hz and 1.5 fT/root Hz at 2 kHz. The length is only 360 mm and the weight is 1.5 kg. The measurement results of the IM also confirm the theoretical noise model and the optimization method.
引用
收藏
页码：3293 / 3300
页数：8
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