Eye-Safe Polarization Diversity Lidar for Aerosol Assessment

摘要NSF 0515977该提案将开发一种移动的、扫描的、人眼安全的激光雷达（光探测和测距），以充分应用激光后向散射去偏振技术来远程表征大气中悬浮的气溶胶。虽然即使是简单的激光雷达也可以有效地探测大气气溶胶并绘制其垂直和空间分布图，但眼睛安全问题严重限制了它们在该领域的应用。 众所周知，线性去偏振测量提供了独特的能力，以检测和分类云和气溶胶的性质，和各种这样的数据将获得使用改进的双通道移动的激光雷达系统。这种激光雷达明确地将球形颗粒与非球形颗粒分开，并且进一步对不规则颗粒的确切形状敏感。激光雷达系统将通过对阿拉斯加已知的气溶胶类型进行采样来进行实地评估，如亚洲沙漠尘埃、北极霾、冰雾、树木花粉、森林火灾烟雾、内燃机副产品和海上喷雾。此外，该系统的设计将适应圆形和完整的斯托克斯参数化的后向散射，为未来的应用，以充分评估人眼安全的偏振分集激光雷达研究领域。该项目将建立一个移动的激光雷达研究设施，该设施将发展成为一个先进的试验台，用于研究激光雷达偏振技术在气溶胶和云研究中的应用。该项目将帮助培养一名激光雷达领域的研究生，并有助于培训气象实验人员。重要的未来扫描研究应用可能在森林火灾，城市污染源，云和降水的空间变化的观察。 偏振激光雷达技术在识别大气中悬浮粒子的性质方面具有独特的潜力。许多气溶胶目标在检测有害物质方面具有类似物。

ABSTRACTNSF 0515977This proposal will develop a mobile, scanning, eye-safe lidar (light detection and ranging) to fully apply the laser backscatter depolarization technique to the remote characterization of aerosols suspended in the atmosphere. Although even simple lidars can be effective at detecting atmospheric aerosols and mapping their vertical and spatial distributions, eye-safety concerns severely limit their application in the field. It is well established that linear depolarization measurements offer unique capabilities to detect and classify the nature of clouds and aerosols, and a variety of such data will be obtained using an improved two-channel mobile lidar system. Such lidars unambiguously separate spherical from nonspherical particles, and further are sensitive to the exact shape of irregular particles. The lidar system will be evaluated in the field by sampling known aerosol types in Alaska such as transported Asian desert dust, Arctic haze, ice fog, tree pollens, forest fire smoke,internal combustion engine by-products, and sea spray. In addition, the system design will accommodate circular and complete Stokes parameterization of the backscattering for future applications to fully evaluate the eye-safe polarization diversity lidar research field. This project will create a mobile lidar research facility that will grow into an advanced test-bed for studying the application of lidar polarization techniques to aerosol and cloud research. The project will help train a graduate student in the lidar field and contribute to the training of meteorological experimentalists. Important future scanning research applications are possible in the observation of forest fires, urban pollution sources, and the spatial variability of clouds and precipitation. Polarization lidar techniques have unique potential for identifying the nature of particles suspended in the atmosphere. Many of the aerosol targets have analogs in the detection of hazardous materials.