Holographic Airborne Rotating Lidar Instrument Experiment (HARLIE)
Holographic Airborne Rotating Lidar Instrument Experiment (HARLIE)
复制标题
全息机载旋转激光雷达仪器实验（HARLIE）
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
G. Schwemmer
中科院分区：
文献类型：
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作者：
G. Schwemmer
扫描全息激光雷达接收器目前用于两种运行激光雷达系统：PHASERS（用于环境遥感的原型全息大气扫描仪）和现在的 HARLIE（全息机载旋转激光雷达仪器实验）。这些系统基于夹在两层高质量浮法玻璃之间的重铬酸盐明胶 (DCG) 制成的体积相位全息图。他们展示了该技术在 532 和 1064 nm 波长的紧凑型扫描激光雷达系统中的实际应用、承受中等高激光功率和能量负载的能力、对于大多数直接检测系统而言足够的光学质量、与传统接收器相媲美的整体效率以及在典型激光雷达系统环境下持续数年的稳定性。它们的尺寸和重量大约是使用反射光学器件的类似扫描系统的一半。全息系统的成本最终将低于反射光学系统，具体取决于其商业化程度。有许多应用程序需要扫描功能或可以从扫描功能中受益匪浅。其中一些是机载系统，它们要么使用焦平面扫描（如激光植被成像系统），要么使用主孔径扫描（如机载海洋激光雷达或大孔径扫描机载激光雷达）。后一类需要飞机上有大的通光孔径开口或窗口。这种类型的系统可以极大地受益于使用 HARLIE 类型的扫描传输全息图，因为所需的通光孔径仅比收集孔径大 25% 左右，而对于偏离最低点 45 度的扫描角则需要大 200-300%。
Scanning holographic lidar receivers are currently in use in two operational lidar systems, PHASERS (Prototype Holographic Atmospheric Scanner for Environmental Remote Sensing) and now HARLIE (Holographic Airborne Rotating Lidar Instrument Experiment). These systems are based on volume phase holograms made in dichromated gelatin (DCG) sandwiched between 2 layers of high quality float glass. They have demonstrated the practical application of this technology to compact scanning lidar systems at 532 and 1064 nm wavelengths, the ability to withstand moderately high laser power and energy loading, sufficient optical quality for most direct detection systems, overall efficiencies rivaling conventional receivers, and the stability to last several years under typical lidar system environments. Their size and weight are approximately half of similar performing scanning systems using reflective optics. The cost of holographic systems will eventually be lower than the reflective optical systems depending on their degree of commercialization. There are a number of applications that require or can greatly benefit from a scanning capability. Several of these are airborne systems, which either use focal plane scanning, as in the Laser Vegetation Imaging System or use primary aperture scanning, as in the Airborne Oceanographic Lidar or the Large Aperture Scanning Airborne Lidar. The latter class requires a large clear aperture opening or window in the aircraft. This type of system can greatly benefit from the use of scanning transmission holograms of the HARLIE type because the clear aperture required is only about 25% larger than the collecting aperture as opposed to 200-300% larger for scan angles of 45 degrees off nadir.