| With the continuous development of Inertial Navigation Systems,there has gradually been a pursuit of higher standards for high precision and miniaturization of gyroscopes.Among many types of gyroscopes,atomic spin gyroscopes meet the requirements and become one of the research hotspots in the field of Inertial Navigation.Alkali atoms work as one of the atom sources of the gyroscope.Measurement of the density distribution of alkali atoms is the first step to solve the key technical problem of cell temperature field control.The number density is one of the most important parameters to calculate and improve the atomic gyroscope performance as well.Based on the prototype of the Nuclear Magnetic Resonance Gyroscope,a method for measuring the number density of alkali atoms by sweeping and fitting the alkali atomic ab-sorption spectra is presented.Different from the previous methods based on absorption spectroscopy,the fitting formula of absorption spectrum in this scheme is modified according to the actual experimental conditions such as temperature,gas pressure,etc.As a result,the accuracy of measurement is improved and the measured number density agrees well with the theory,just with a deviation of approximately 20%.It is also further applied to calibrate the actual temperature of alkali vapor in gyroscope cells.At the same time,using the absorption effect of the alkali atoms on the far-detuned probe beam,a scheme for real-time calibration of the temperature and measurement of the density of alkali atoms at specific positions in the cell is proposed.Thus,the measurement of the density distribution of the alkali atoms in the gyroscope cell is realized.The LabVIEW program with a full set of data acquisition and processing is written to realize the automated,programmatic and methodical measurement and analysis process.Finally,the application of the measurement scheme mentioned in this thesis and the related research of gyroscope are prospected. |
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