Optimum Design Of Nuclear Magnetic Resonance Gyroscopes

Gyroscopes are instruments used to measure the rotation angular rate or angular of carrier relative to inertial space, and are one of the key part of Inertial Navigation Systems (INSs). Gyroscopes are widely used in the field of civil navigation and national security. Nuclear magnetic resonance gyroscope (NMRG) become the focuses in gyroscope research field recent years due to its superiority of combination both miniaturization and high precision.This thesis we present theoretical analysis and optimization of NMRG based on 133Cs-129Xe/131Xe. At the same time, we developed the DBR laser for this nuclear magnetic resonance gyroscope. Firstly, the principle of NMRG, the optical pumping and optical detection mechanisms, the magnetic field control and compensation schemes are detailedly presented. Secondly, the pump and relaxation processes of 133Cs, the quenching gas (N2) pressure and pump light power, the magnitude of the macroscopic magnetic field induced by polarized 129Xe/131Xe and the influence of frequency detuning to detected signal due to faraday rotation effect are calculated and optimized theoretically one by one through discuss the interaction between light and atoms, and atoms and atoms. At last, we developed the DBR lasers for pumping (895 nm) and probing (852 nm) of the NMRG. Meanwhile, we realized the frequency stabilization of 852 nm DBR laser via frequency modulation (FM) method and modulation transfer spectrum (MTS) method respectively. In addition, we developed two sets of DBR laser system to measure the frequency drift of frequency stabilized 852 nm DBR laser by beat frequency method. The beat frequency drift of two FM stabilized 852 nm DBR laser is 180 kHz at 1 hour, the beat frequency drift of two frequency stabilized 852 nm DBR lasers using FM method and MTS method is 715 kHz at 2 hours, the beat frequency drift of two frequency stabilized 852 nm DBR lasers using MTS method is 900 kHz at 100 minutes. As a contrast, the 852 nm DBR laser frequency drift is about 34 MHz at 1 hour in the free running condition. It is obvious that the FM method and MTS method both can improve the laser frequency stabilization significantly by compare the Allan deviation. Next, we will implement the frequency stabilization of 895 nm DBR laser and optimize the design of frequency stabilization system to supply frequency stabilized and compact pump and probe laser source for subsequent NMRG system.