Gradient Tolerance Estimation of Overhauser Magnetometer

2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC) Pub Date : 2019-12-01 DOI:10.1109/IAEAC47372.2019.8997914

Wenqiang Shi, Shuang Zhang, Jianchang Zhao, Shudong Chen, Xin Guo

{"title":"Gradient Tolerance Estimation of Overhauser Magnetometer","authors":"Wenqiang Shi, Shuang Zhang, Jianchang Zhao, Shudong Chen, Xin Guo","doi":"10.1109/IAEAC47372.2019.8997914","DOIUrl":null,"url":null,"abstract":"Overhauser proton magnetometer is a scalar quantum device for total magnetic field measurement based on the dynamic nuclear polarization (DNP) effect. The earth generates a weak and uniform magnetic field about 18 μT to 60 μT. The magnetic anomaly in the survey area will generate a gradient magnetic field which decreases the accuracy of the magnetometer. The gradient tolerance is the maximum magnetic field gradient that the magnetometer can tolerate. A gradient coil consisting of two circular coils connected in reverse has been constructed to estimate gradient tolerance value of Overhauser magnetometer. The distance between the two circular coils is set as $\\sqrt 3 $ R, where R is the radius of the circular. Calculated results indicate that the uniformity of the gradient can reach 99% in the range of 5×5×11 cm when the radius of the circular R is set as 0.3 m. Proton precession signal and sensitivity of Overhauser magnetometer under gradient field from 0 nT/m to 12000 nT/m are investigated. Beat phenomenon is observed under high gradient field. The experimental results show that under the background field strength of about 54500 nT, the fluctuation of the measurement results increases with the increase of the gradient.","PeriodicalId":164163,"journal":{"name":"2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)","volume":"1 8","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/IAEAC47372.2019.8997914","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 0

Abstract

Overhauser proton magnetometer is a scalar quantum device for total magnetic field measurement based on the dynamic nuclear polarization (DNP) effect. The earth generates a weak and uniform magnetic field about 18 μT to 60 μT. The magnetic anomaly in the survey area will generate a gradient magnetic field which decreases the accuracy of the magnetometer. The gradient tolerance is the maximum magnetic field gradient that the magnetometer can tolerate. A gradient coil consisting of two circular coils connected in reverse has been constructed to estimate gradient tolerance value of Overhauser magnetometer. The distance between the two circular coils is set as $\sqrt 3 $ R, where R is the radius of the circular. Calculated results indicate that the uniformity of the gradient can reach 99% in the range of 5×5×11 cm when the radius of the circular R is set as 0.3 m. Proton precession signal and sensitivity of Overhauser magnetometer under gradient field from 0 nT/m to 12000 nT/m are investigated. Beat phenomenon is observed under high gradient field. The experimental results show that under the background field strength of about 54500 nT, the fluctuation of the measurement results increases with the increase of the gradient.

查看原文本刊更多论文

磁强计的梯度容差估计

Overhauser质子磁强计是一种基于动态核极化(DNP)效应测量总磁场的标量量子装置。地球产生微弱而均匀的磁场，约为18 μT ~ 60 μT。测量区内的磁异常会产生梯度磁场，降低磁强计的精度。梯度容差是磁力计所能承受的最大磁场梯度。为估计奥弗豪瑟磁强计的梯度容差值，构造了由两个反向连接的圆形线圈组成的梯度线圈。两个圆线圈之间的距离设为$\sqrt 3 $ R，其中R为圆的半径。计算结果表明，当圆半径R为0.3 m时，在5×5×11 cm范围内梯度均匀性可达99%。研究了在0 ~ 12000 nT/m梯度场下，奥弗豪瑟磁力计的质子进动信号和灵敏度。在高梯度场下观察到热现象。实验结果表明，在约54500 nT的背景场强下，测量结果的波动随梯度的增大而增大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

2019 IEEE 4th Advanced Information Technology, Electronic and Automation Control Conference (IAEAC)

自引率

0.00%

发文量