Abstract:

In order to suppress the influence of low-frequency magnetic field interference, such as geomagnetic diurnal variation, on the measurement results, multiple magnetometers are usually used for synchronous measurement. The time synchronization error has an obvious influence on the suppression effect. The influence of different time synchronization errors is studied on the JOM-5SF Overhauser magnetometer in geomagnetic detection and instrument sensitivity evaluation, based on the magnetometer developed in the laboratory. Two Overhauser magnetometers are used to conduct experiments on the campus of Jilin University. After comparing

the experimental results with the evaluation results of professional institutions, it is found that the smaller the time synchronization error, the smaller the difference between the magnetic field values of the two instruments, and the more accurate the sensitivity of the evaluation instruments by the synchronous method.

Key words: Overhauser magnetometer, time synchronization, sensitivity, geomagnetic sounding