对流层气溶胶光学遥感高灵敏度高精度双波长UV-VIS偏振探测器
Sensitive and accurate dual wavelength UV-VIS polarization detector for optical remote sensing of tropospheric aerosols
摘要：
紫外可见光偏振激光雷达已被设计和指定用于对流层气溶胶监测，显示出在几个波长范围内精确解决低粒子去偏振比的能力。已测量出低至5 { \times } 10-8 m-1.sr-1的非球形颗粒后向散射系数，颗粒去极化比检测限为0.6%。这一成就是基于一个精心设计的检测器与激光指定的光学元件（偏振器，二向色分束器）总结在一个合成的检测器传输矩阵。因此，系统性偏差被极大地最小化。探测器矩阵是对角的，在实际大气条件下实现了稳健的偏振校准。这款UV-VIS偏振检测器可测量两个数量级以上的粒子退偏振比，范围从0.6到40%，这是一种新的测量方法，尤其是在分子散射较强的紫外线下。因此，提出了一个经过校准的紫外线偏振分辨的时间-高度图，适用于高度不超过4公里的城市和自由对流层气溶胶，这也是一个新的方法。这些灵敏而精确的紫外-可见光偏振分辨测量增强了对流层非球形颗粒的空间和时间演变，即使在城市污染区也是如此。这项研究表明，偏振分辨激光紫外-可见光谱的能力，专门解决球形和非球形对流层气溶胶的光后向散射。
英文摘要：
An UV-VIS polarization Lidar has been designed and specified for aerosols monitoring in the troposphere, showing the ability to precisely address low particle depolarization ratios, in the range of a few percents. Non-spherical particle backscattering coefficients as low as 5 {\times} 10-8 m-1.sr-1 have been measured and the particle depolarization ratio detection limit is 0.6 %. This achievement is based on a well-designed detector with laser-specified optical components (polarizers, dichroic beamsplitters) summarized in a synthetic detector transfer matrix. Hence, systematic biases are drastically minimized. The detector matrix being diagonal, robust polarization calibration has been achieved under real atmospheric conditions. This UV-VIS polarization detector measures particle depolarization ratios over two orders of magnitude, from 0.6 up to 40 %, which is new, especially in the UV where molecular scattering is strong. Hence, a calibrated UV polarization-resolved time-altitude map is proposed for urban and free tropospheric aerosols up to 4 kilometres altitude, which is also new. These sensitive and accurate UV-VIS polarization-resolved measurements enhance the spatial and time evolution of non-spherical tropospheric particles, even in urban polluted areas. This study shows the capability of polarization-resolved laser UV-VIS spectroscopy to specifically address the light backscattering by spherical and non-spherical tropospheric aerosols.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
