| In this thesis, the setup of cold atomic interferometer for precise measurement of gravitational acceleration based on the stimulated Raman transition is designed and implemented, and its performance is evaluated.In the first chapter, the importance of precise gravitational acceleration meas-urement is outlined. The history and the latest progress of cold atom interferometry research is reviewed.In the second chapter, the basic theory of atom interferometry is presented, which includes the interaction of light with atom and evolution of atomic quantum state. In specific, the transition in light field between two levels and stimulated Raman transition among three levels are solved using the quantum perturbation method. Based on these results, the interferometer is plotted and its sensitivity is calculated.In the third chapter, the hardware designs and related theories are introduced. The contents cover the laser frequency stabilization, optical phase lock loop, cold at-om source and atomic state detection technologies.In the fourth chapter, the software design used in this instrument is presented, in-cluding the instrument controlling, data collection and analysis in the form of design principle, code detail and possible improvement.In the fifth chapter, the detailed instrument performance evaluation is conducted including the base noise level and systematic error cancelling.The atom interferometer achieved in this thesis has high sensitivity in the meas-urement of gravity acceleration. The gravity measurement precision of8uGal is reached within200second integration time, which is equivalent to a sensitivity of1.1×10-7g/(?). This atom interferometer is also suitable to observe the long-term de-viation of the local gravity. The solid tide is clearly observed in our lab, which coin-cides with the theoretical results very well. The relative gravity precision of10-7g has been achieved. Finally, some conclusions and looking forward of this research are presented. |
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