Design Of Proton Precession Magnetometer And Implementation Based On DSP

Proton precession magnetometer is a kind of instrument which is widely applied in measuring the unknown magnetic field.The key is to improve the signal-to-noise ratio of the precession signal and frequency measuring technology.Through measuring the frequency of precession signal can we get the value of unknown magnetic field.Existing proton magnetometer system has problems of high system cost, limited functionality,Inaccurate frequency measurement and so on.In order to solve problems above,MJW-1T Proton Magnetometer based on present situation home and abroad is designed.The design scheme of the new proton magnetometer system based on DSP28335 has been achieved and the prototype has been completed. the following work has been accomplished:1、The circuit design of magnetometer functional modules including precession signal processing circuit, power circuit, storage circuit, clock circuit, LCD display circuit has been completed, which is in order to perfect the auxiliary function of the proton magnetometer.2、A new algorithm of measuring precession frequency and its testing work are accomplished.the test result shows that the accuracy reaches 0.04 Hz.3、According to different kinds of solvent,the impact on the initial precession signal in amplitude and relaxation time has been analyzed and tested.the result shows that the effect of kerosene is the best.4、To DEM proton magnetometer which is on behalf of the domestic advanced level as a reference,the whole system is tested in wild areas.The result shows that the power consumption of MJW-1T is 3.52 W under normal working state, 21.84 W under polarization state. The precision of the device is±1nT, expected target has been reached.