为了实现差分吸收激光雷达对臭氧浓度和气溶胶的同时探测，对常见的三通道分光光谱仪进行改进优化。确定光谱仪初始结构后，使用光栅方程对四通道的摆放位置进行计算分析。使用球面镜和全息光栅，通过添加距离约束，将四个光谱通道控制在合理的机械结构范围内，最终设计了一款四通道分光、低F数的光谱仪系统。该系统使用圆阵列转线列光纤，提高了接收系统对大气回波信号的接收强度，实现了对266，289，316，532 nm回波信号强度的精确探测。设计结果表明，光谱仪系统可连接0.12数值孔径的线列光纤，在266，289，316 nm光谱分辨力优于0.5 nm，在532 nm处光谱分辨力优于1 nm，满足激光雷达探测光谱分辨率的要求。分析了光谱仪出射狭缝的曲率半径和圆心位置。该设计可实现激光雷达对气溶胶和臭氧的同时探测，简化了系统结构。

In this study, the common three-channel spectrometer was improved and optimized to realize the simultaneous detection of ozone and aerosol concentration using differential absorption lidar. First, the initial structure of the spectrometer is determined, followed by the calculation and analysis of the position of the four channels using the raster equation. Then, the four spectral channels are controlled within a reasonable mechanical structure range by adding distance constraints using a spherical mirror and a holographic grating. Finally, a four-channel and low F number spectrometer system is designed. The system uses circular array to linear fiber to improve the reception intensity of the receiving system for atmospheric echo signals and realizes accurate detection for 266, 289, 316, and 532 nm echo signal strength. The results show that the proposed spectrometer system can be connected to a linear fiber with a 0.12 NA. The obtained spectral resolution is better than 0.5 nm and 1 nm at 266, 289, 316 and 532 nm, respectively, thus, meeting the spectral resolution requirements of lidar detection. Moreover, the spectrometer's radius of curvature of the exit slit and the center position of the circle are analyzed. Our findings show that the proposed design can realize the simultaneous detection of aerosol and ozone by lidar and can also simplify the system structure.