Abstract:

Overhauser magnetometer is a high sensitivity magnetostatic measuring instrument based on Overhauser effect. It has become a hot research topic in recent years, because it has high performance and is widely used. The working principle and hardware structure of JOM-1 Overhauser magnetometer are given and
some key parts such as RF(Radio Frequency) excitation circuit, signal processing circuit, working sequence,noise level and experimental results are introduced. Field tests indicate that JOM-1 Overhauser magnetometer has achieved basic functions such as data collection, display, storage, viewing and so on. 0. 14 nT sensitivity is obtained and initial signal to noise ratio can reach 96:1, which is three times of the JPM-1 proton precession magnetometer fabricated by our lab.

Key words: Overhauser magnetometer, proton magnetometer, sensitivity, radio frequency (RF) excitation, signal processing