设计了一种测量气体自发瑞利-布里渊散射频谱的系统。激光器输出波长为532 nm 的连续窄带光，激光束聚焦到压力可控的密闭气体散射池中，与气体分子相互作用，产生散射信号，在散射池侧向90°方向测量气体的自发瑞利-布里渊散射频谱。使用该系统测得了氮气在温度为300 K，压强为300 kPa 下的自发瑞利-布里渊散射频谱，并将实验结果与Tenti S6 模型仿真结果进行了对比，分析了偏差产生的主要原因，为未来空间激光雷达大气参数的测量提供了参考。

An experiment system to measure the spontaneous Rayleigh- Brillouin scattering line profiles of gas is designed in this paper. A narrow bandwidth laser delivers a vertical polarization beam of continuous wave light at 532 nm. The beam is focused on the pressure controlled gas cell, interacts with gas molecules and generates the scattering signal. The spontaneous rayleigh- brillouin (RB) scattering line profiles of gas are measured at the lateral direction of 90° of the cell. The spontaneous RB scattering line profiles of N2 under the temperature of 300 K and the pressure of 300 kPa are measured by this system. The results of experiment and simulation results of Tenti S6 model are compared and the causes of the deviation between them are analyzed. It provides a reference for future space lidar measurement of air parameters.