Theoretical Study Of Vector Cesium Magnetometer Based On RF Field

Magnetic field,as a kind of physical quantity widely existing in the interaction of matter itself and matter and matter,is also one of the earliest cognitive physical phenomena of human beings.It has always been concerned by scientists.As a hot topic of scientific research,the magnetic field measurement technology is also developing in more and more precise directions with the needs of practical applications.There are many methods and instruments for magnetic field measurement.The most common ones are induction coil magnetometer,fluxgate magnetometer,superconducting quantum interference magnetometer,and atomic magnetometer.Among them,due to the wide application of atomic magnetometers,such as the measurement of magnetoencephalograms and magnetocardiograms in the field of biological magnetic fields,measurement of the earth's magnetic field in the field of the spatial magnetic field,measurement of the information of the magnetic field in the universe,magnetic resonance imaging in the field of nuclear magnetic resonance,magnetic gradiometer;The detection of unexploded bombs and anti-submarine aircraft in the area of national defense and military affairs has been extensively studied due to its high sensitivity,low cost,and advantages in favor of miniaturization.Different applications have different requirements for magnetometers.The research of atomic magnetometers at home and abroad is to study their structural principles,improve sensitivity and accuracy,miniaturization,and higher resolution of magnetic imaging based on atomic magnetometers.This article discusses the vector atomic magnetometer based on the excitation of RF field,describes its structural classification in detail and gives its signal expression,and then performs theoretical analysis and simulation calculation on this basis.In this paper,the development status of atomic magnetometer at home and abroad in the past 15 years is introduced first,and the significance of atomic magnetometer research is proposed.In particular,the measurement of the vector field is the development direction of magnetism measurement in today's magnetometers.Subsequently,the vector atomic magnetometer was classified based on the polarization of the pump light,and the circular polarized light pumped vector-polarized atomic magnetometer and the linearly polarized light pumped tensor polarized atom magnetometerwere analyzed.The structural models of these two atomic magnetometers were established and the signal formulas obtained were analyzed.Then,the important role of the atomic gas chamber in the atomic magnetometer and the important index parameters and relaxation rate of the atomic gas chamber are introduced.At the same time,the Hanler effect in the atomic gas cell based on the external magnetic field is introduced,and the longitudinal Haner effect and the transverse Haner effect are analyzed theoretically.The atomic cavitation relaxation rate measurement based on the longitudinal Haner effect was completed under theoretical and experimental conditions.Finally,a theoretical study of the atomic vector magnetometer using resonant linearly polarized light is presented.Linearly polarized light is used to excite the atomic tensor magnetic moment in the vector magnetic field.By solving the steady state solution of the Liu Weier equation,the DC,first harmonic,and second harmonic components of the signal are obtained.For the analysis and theoretical study of these three signals,all the information of the vector magnetic field can be obtained.The results show that the magnetometer has applications such as magnetometer array,magnetic positioning,underwater magnetic anomaly detection,and geomagnetic navigation.