Study on atomic magnetometer

Title: Study on atomic magnetometerAuthor: Shu-Guang LiDegree-granting unit: Zhejiang UniversityKey words: magnetic field measurement;; Zeeman effect;; optical pumping effect;; atomic magnetometerSummary:Weak magnetic field detection technology in many aspects, such as medical, military, geophysical, and industry all have an irreplaceable role. In this work, we developed a weak magnetic field detection for high sensitivity atomic magnetometer experimental device, and its working principle, structure and measurement equipment to do the relevant research and analysis.In the first chapter introduced the Rare earth magnets research background, meaning and purpose. The first shows a weak magnetic field detection technology. Secondly describes the most commonly used high-sensitivity magnetometer works and features. Magnetometer and analysis of the current trend of development in all areas of needs and the importance of independent research and development, we also proposed a high-performance atomic magnetometer device developed by the research objectives.In the second chapter, by giving the atoms and light, the basic theory of magnetic field, and after the relevant calculations, a new theory to explain the basic atomic magnetometer works. Which describes the characteristics of rubidium atoms and the Zeeman effect; analysis of the optical pumping effect; with the Schrödinger equation of quantum mechanics to calculate the magnetic field on the atomic state vector and the impact of changes in the absorption of the light intensity theoretical relationship. Analysis of the theoretical curve given by the expression characteristics, and use the curves present a basic atomic magnetometer device design.In the third chapter describes the atomic structure of the experimental device magnetometer, including the light source part, magnetic sensors and signal detection part of the other part. Light source section, through the precise adjustment of laser parameters and stability of wavelength and other methods to achieve the output beam is used to detect the resonant circularly http://www.chinamagnets.biz/faq.php polarized laser; magnetic sensor by adjusting the temperature of rubidium atoms of rubidium atoms to provide a suitable density and incident detecting light, the role of magnetic fields; signal detection section, the transmission through the photodiode to detect light intensity and associated signal processing computer, get the size of the magnetic field.In the fourth chapter, the experimental atomic magnetometer device performance test, measurement and simulation results. First, verify that the transmitted light intensity and the magnetic field the size relationship between the experimental and theoretical consistency; followed by simulated measurements and sensitivity test, with good results; finally also a variety of factors that affect the sensitivity of the test, and analyzed the causes and the corresponding improvement ideas.In the fifth chapter, a summary of the full text of the work, and the improvement of atomic magnetometer, and broad application prospects are described.Degree Year: 2009