Author:
Zhao Jianchang,Chen Shudong,Zhang Shuang
Abstract
Abstract
Overhauser proton magnetometer is a scalar instrument for measuring the total magnetic field intensity. Sensitivity, as one of the important specifications, reflects the ability to measure the change of magnetic field when detecting magnetic anomalies. It is very important to study the sensitivity estimation method for accurately evaluating the sensitivity specification of the magnetometer. In this paper, two methods, synchronous measurement method and gradient measurement method, are proposed to estimate the instrument sensitivity. The experimental results show that the lower the external environmental electromagnetic interference is, the more accurate the sensitivity estimation is. Furthermore, when the synchronization accuracy is about 1.7 milliseconds, the estimation results of the synchronization measurement method and the gradient measurement method are almost equal. Finally, in the environment with low electromagnetic interference, the sensitivity estimation of the JOM-4 magnetometers is 0.042 nT@3s.
Reference8 articles.
1. Application of SeaSPY Marine Magnetometer to Cable Detection in South China Sea;Nian;Chinese Journal of Engineering Geophysics,2010
2. Overhauser magnetometer for the Danish Oersted satellite;Duret;IEEE Transactions on magnetics,1995
3. Novel quantum NMR magnetometer non-contact defectoscopy and monitoring technique for the safe exploitation of gas pipelines;Narkhov;WIT Transactions on Ecology and the Environment,2014
4. Commercial magnetometers and their application;Hovde;Optical Magnetometry,2013
5. Development of JOM-1 model overhauser magnetometer;Zhang;Journal of Jilin University (Information Science Edition),2015