陀螺仪气室中碱金属原子数密度的检测

碱金属原子作为原子陀螺仪原子源的组成部分，其数密度是计算原子陀螺仪工作指标的重要参数。基于碱金属原子对不同激光失谐的吸收程度不同，提出了一种通过拟合碱金属原子吸收光谱得到碱金属原子数密度的测量方案。不同于以往的吸收测量法，该方案针对实际实验温度和气体压强等条件，对吸收谱拟合式进行了修正，从而提高了测量结果的准确度。测量结果与理论计算结果相吻合，两者偏差仅1.2倍左右，并可进一步应用于校准气室内碱金属蒸气的实际温度值。

Measurement of the Number Density of Alkali Atoms in Gyroscope Cells

The alkali metal atoms are the components of the atomic source of the atom gyroscope. The number density of alkali atoms is an important parameter to calculate the atomic gyroscope performance. Based on the different absorption of alkali atoms to different laser detuning, a method to measure the atomic number density of alkali atoms by fitting the atomic absorption spectra of alkali is proposed. Different from the previous methods based on absorption spectroscopy, this scheme modifies the absorption spectrum fitting formula according to the actual experimental conditions such as temperature and gas pressure, so as to improve the accuracy of the measurement results. The measurement results are in good agreement with the theoretical calculation results, with a deviation of only 1.2 times. It is further applied to calibrate the actual temperature value of alkali vapor in gyro cells.