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研制了一套接收硬目标回波的差分吸收激光雷达系统以用于全天候监测大气CO2浓度变化.系统采用10和12 kHz正弦波分别对处在CO2吸收峰内和吸收峰外的波长进行强度调制,利用单频检测技术提取回波信号.提出了一种利用激光扫频推算系统精度的方法,从而弥补了长期以来只能在理论上计算差分吸收激光雷达系统精度的不足,给实际系统自定标问题提供了一种解决方案.该系统采用全光纤结构,结构可靠,便于移动.利用此系统获得了上海市多天CO2浓度变化曲线,在450 m的积分路径长度上,1 s的积分时间取得了优于3.39×10-6的测量精度.
A set of differential absorption lidar systems receiving hard target echoes were developed for monitoring atmospheric CO2 concentration changes around the clock.The system uses 10 and 12 kHz sine waves to respectively intensity modulate the wavelengths within and outside the absorption peaks of CO2 , The single-frequency detection technique was used to extract the echo signal.A method of using laser swept-frequency to calculate the system accuracy was proposed to make up for the lack of accuracy in the theory of differential absorption lidar for a long time, This system provides a solution to the problem.The system uses all-fiber structure, reliable structure, easy to move.This system was used to obtain the multi-day CO2 concentration curve in Shanghai, the integral path length of 450 m, 1 s integration time Achieved better than 3.39 × 10-6 measurement accuracy.