OVERHAUSER磁力仪灵敏度表征方法研究

为评价OVERHAUSER 磁力仪的综合性能, 同时为质子磁力仪的研发提供理论指导, 研究了灵敏度在时域和频域的表征方法, 并在理论上证明了两种表征方法本质上的一致性; 分析了采样率对灵敏度的影响; 设计实验标定了JPM鄄2 型质子磁力仪的灵敏度。实验结果表明, JPM鄄2 型质子磁力仪灵敏度时域表征为0. 18 nT,频域表征为0. 32 nT/ Hz@0. 1 Hz, 得到了测量数据日变分量、噪声分量的频域分布图。

Study on Method of Sensitivity Characterization for OVERHAUSER Magnetometer

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.