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探测低空大气CO2浓度的同时可以探测大气风场。采用相干探测较非相干探测具有更高的信噪比,而目前1.5μm波长由于在人眼安全、系统设计简单廉价等方面存在一定优势,使1.5μm可能成为未来探测气溶胶激光雷达的主流波长。本文阐述了激光雷达相干探测大气CO2与风场的原理,设计了1.5μm相干探测激光雷达系统,并对系统的信噪比进行了估算,得出结论:1.5μm相干探测风场与CO2是可行的,经过3分钟的脉冲积累,在3km处仍具有高于10的信噪比值。
Atmospheric wind field can be detected while detecting atmospheric CO2 concentration in low altitude. Compared with non-coherent detection using coherent detection has a higher signal-to-noise ratio, and the current 1.5μm wavelength due to the safety of the human eye, the system design is simple and cheap, there are some advantages, so that 1.5μm may become the mainstream of future detection aerosol laser radar wavelength . In this paper, the principle of lidar coherent detection of atmospheric CO2 and wind field is described. A 1.5μm coherent detection lidar system is designed and the signal to noise ratio of the system is estimated. The conclusion is that 1.5μm coherent detecting wind field and CO2 are feasible After 3 minutes of pulse accumulation, still has a signal to noise ratio of above 10 at 3 km.