The Improvement And Experimental Study Of JOM-2 Overhauser Magnetometer

As the detection of weak magnetic signal of Overhauser magnetometer,through the dynamic nuclear excitation effect caused by nuclear magnetic resonance,enhance the polarization efficiency,according to the Larmor precession theory,design of polarization of DC and RF circuit,receiving the sensing signal,through the conversion formula between the magnetic field and Larmor frequency calculation,magnetic field intensity,the measurement results will be stored and reasonable mathematical operations according to the value of the magnetic field,as well as the results of operations analysis of the measured magnetic anomaly area.On the basis of the research of the two generation Overhauser magnetometer in this research group,the existing problems are improved and optimized,and the relevant index test experiments are carried out to test the performance index level of the instrument after improvement.First introduces the current research status at home and abroad Overhauser magnetometer,and illustrates the importance of independent development of Overhauser magnetometer,then describes the overall design mentality of improved version of magnetometer system at this stage,followed by analysis of the irrationality of previous digital circuit hardware design of the magnetometer in the following chapters,and the power supply,liquid crystal display buttons and interface module are analyzed and improved,making the instrument in the hardware circuit is simple and reliable.At the same time the previous software design was optimized on the basis of the original features for matching,fast measurement and man-machine interface function is optimized,the software platform can meet the needs after the upgrade.Finally,in terms of key performance parameters by combining the parameters compared with the international leading commercial magnetometer,the improved JOM-2 magnetometer were tested from noise,measurement range,measurement sensitivity,rapid measurement,gradient tolerance and other important indicators of the evaluation,to determine the measurement range of the improved magnetometer can reach 20000 n T-120000 n T the standard input sinusoidal signal measured static magnetic sensitivity of 0.0058 n T in indoor and field test sensitivity can reach 0.05 n T,the fastest to 0.2S cycle measurement,and gradient tolerance is not weaker than GSM-19.