Design And Implementation Of Cesium Optical Pumping Of Weak Magnetic Detection Circuit

With the rapid development of modem high technology,quite a number oftechnical areas almost can be without the Magnetic field measurement.Magnetic fieldmeasurement which is essentially the measurement of magnetic flux density,has awide range of applications and development in related field,such as the detection ofmagnetic field source national defense military project,atomic frequency standard andweak magnetic field detection.Nowadays,based on many existing ways of magneticfield Measurement,the corresponding magnetic field measuring equipments havebeen developed.Caesium optically pumped magnetometer is a kind of high precision sensor,withhigh resolution, high sensitivity, digitization, miniaturization, electronic magneticcompatibility. At present our country is still in its primary stage, which has a bigdisparity with the rest of the world’s advanced level and mature product. What’s moremagnetometer with high-performance is embargoed, listed on the west export controllist.So developing the magnetometer is of significance.This topic research content is by using the cesium atomic transition theory,andstructure,the relaxation effect,and the theory of optical magnetic resonance andgradient measuring some atomic physics related theory,to design the correspondingdriver circuit,constant temperature control circuit,photoelectric detection and opticalmagnetic resonance signal measuring device, realizing the function of caesiumoptically pumped magnetometer with the stability of the instrument and highefficiency.In this paper,we have discussed the principle of atomic physics of the opticallypumped magnetometer system,draw the overall structure diagram of the system,andpresent the various modules of the detailed circuit diagram and the software design part,At the same time,wo analyzed the corresponding test data,verified the feasibilityof the integrity of the whole system.This article mainly talk about the followingaspects.Firstly,we introduced the basic working principle of cesium optically pumpedmagnetometer,namely the atomic energy level transition theory.Besides the contentincludes the atomic energy level structure,optically pumped cesium effect,thephysical principle of magnetic resonance(NMR) relaxation effect and light and soon,and cesium spectral lamp luminous and the principle of constant temperature.Secondly,we finished the optoelectronic detection circuit design and realizedmagnetic resonance signal measuring device.We also realized the design of thehardware system and various parameters of the circuit,and proposed the design ofpreamplifier,intermediate stage amplifier circuit,output amplifier, microcomputercontrol module,frequency meter module,DDS module and serial data communicationmodule.