Research On Magnetometer Light Source And Photoelectric Detection Technology

Geomagnetic navigation is passive autonomous navigation with advantages of strong anti-interference ability,high precision and accumulative error-free.It has breathtaking prospects in military and civil areas.Geomagnetic matching is the critical technology for the application of geomagnetic navigation.However,the performance of the magnetic field measurement instrument is main constraint for the accurate matching of the measured signal and the geomagnetic reference map.In this paper,the magnetometer is taken as the research object,and the light source and the photoelectric detection technology is studied.The main work and research achievements include:1)On the basis of research of operational principle of the atomic magnetometer,Zeeman effects of rubidium atoms in the magnetic field and the optical pumping process are analyzed.Based on atoms energy level principle and the photoelectric conversion principle,analytic formula between the detection voltage and magnetic field detector is derived.2)Laser frequency stabilization is studied.The required laser wavelength is obtained by controlling the temperature of laser diode.Laser wavelength is stabilized by maintain the constant current.In this paper,aiming at the requirement of light source and the magnetometer photoelectric detection technology,temperature control circuit with 0.1 degrees accuracy and constant current source control circuit with 0.1 mA are designed,which could reach the precisions of 39.5±0.1? and 35.0±0.1mA.The photoelectric detection circuit is designed.3)The parameters of aspheric lens are optimized and analyzed by ZEMAX software.The parameters of collimating lens and condenser lens are determined.The optical path of the system is designed;a double optical path difference detection system is wired.The validity of circuit design and optical design is verified by circuit and optical experiment.Meanwhile the experimental results show that light source part and photoelectric detection part of atomic magnetometer is feasibility.