Suppression of the Bias Error Induced by Magnetic Noise in a Spin-Exchange Relaxation-Free Gyroscope

被引：55

作者：

Fan, Wenfeng ^{[1
,2
]}

Quan, Wei ^{[1
,2
]}

Liu, Feng ^{[1
,2
]}

Xing, Li ^{[1
,2
]}

Li, Gang ^{[1
,2
]}

机构：

[1] Beihang Univ, Sch Instrumentat & Optoelect Engn, Beijing 100191, Peoples R China

[2] Beihang Univ, Sci & Technol Inertial Lab, Beijing 100191, Peoples R China

来源：

IEEE SENSORS JOURNAL | 2019年 / 19卷 / 21期

基金：

中国国家自然科学基金;

关键词：

Gyroscopes; Magnetic noise; Sensitivity; Laser excitation; Sensors; Magnetic shielding; Magnetometers; Nuclear spin gyroscope; spin-exchange relaxation-free (SERF); error suppression; magnetic noise; FIELDS;

D O I：

10.1109/JSEN.2019.2929505

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：

Spin-exchange relaxation-free gyroscope (SERFG) is a promising rotation sensor, and the bias error is one of its most important characteristics. It is identified that rotation measurement noise induced by thermal magnetization fluctuations inherent in the ferrite shield in a SERFG limits its bias stability. The root cause of this error lies in the low-frequency magnetic field sensitivity dominated by the nuclear spin relaxation rate. In this paper, the steady state response model of the SERFG is modified considering the non-negligible nuclear relaxation rate and the pressure-dependent magnetic field sensitivity is experimentally studied. Our results show that reducing nuclear spin relaxation is an effective method to suppress the bias error induced by thermal magnetization fluctuations. Finally, in case of Pneon = 1 atm, it is estimated that a bias stability limit of 5 x 10(-4) deg/h is set by the lowest thermal magnetization noise of 4.4 f(-1/2) fT ever reported in a ferrite shield.

引用

页码：9712 / 9721

页数：10

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