Cadiou Erwan, Mammez Dominique, Dherbecourt Jean-Baptiste, Gorju Guillaume, Pelon Jacques, Melkonian Jean-Michel, Godard Antoine, Raybaut Myriam
Opt Lett. 2017 Oct 15;42(20):4044-4047. doi: 10.1364/OL.42.004044.
We report on the capability of a direct detection differential absorption lidar (DIAL) for range resolved and integrated path (IPDIAL) remote sensing of CO in the atmospheric boundary layer (ABL). The laser source is an amplified nested cavity optical parametric oscillator (NesCOPO) emitting approximately 8 mJ at the two measurement wavelengths selected near 2050 nm. Direct detection atmospheric measurements are taken from the ground using a 30 Hz frequency switching between emitted wavelengths. Results show that comparable precision measurements are achieved in DIAL and IPDIAL modes (not better than a few ppm) on high SNR targets such as near range ABL aerosol and clouds, respectively. Instrumental limitations are analyzed and degradation due to cloud scattering variability is discussed to explain observed DIAL and IPDIAL limitations.
我们报告了一种直接探测差分吸收激光雷达（DIAL）用于大气边界层（ABL）中一氧化碳距离分辨和积分路径（IPDIAL）遥感的能力。激光源是一个放大的嵌套腔光学参量振荡器（NesCOPO），在2050nm附近选择的两个测量波长处发射约8mJ的能量。利用发射波长之间30Hz的频率切换，从地面进行直接探测大气测量。结果表明，在DIAL和IPDIAL模式下，分别在近程ABL气溶胶和云等高信噪比目标上实现了相当精度的测量（不优于几个ppm）。分析了仪器的局限性，并讨论了由于云散射变化导致的退化，以解释观测到的DIAL和IPDIAL局限性。
