Abstract:

In order to evaluate the comprehensive performance of OVERHAUSER magnetometer, and provide theoretical guidance for the development of proton magnetometer, the methods of sensitivity characterization of OVERHAUSER magnetometer in time domain and frequency domain are studied. Theoretical research proves that the two methods are essentially consistent. The effect of sample rate on sensitivity is analyzed. Study shows that the signal quality is the main impact on sensitivity. Experiments are designed to calibrate sensitivity of JPM-2 type proton magnetometer, and experimental results indicate that the sensitivity of JPM-2 type proton magnetometer is 0. 18 nT when characterized in time domain, and 0. 32 nT/ Hz@0. 1 Hz when characterized in frequency domain. We obtain the frequency domain distribution figure of measurement data for diurnal variation component and noise component.

Key words: OVERHAUSER magnetometer, sensitivity, time domain, frequency domain, noise