羽流撞击效应的阿波罗视频摄影测量估算（会议版）
Apollo Video Photogrammetry Estimation of Plume Impingement Effects (conference version)
摘要：
星座计划的重返月球计划需要在同一地点进行多次着陆。由于顶部几厘米是松散堆积的风化层，着陆器的羽流撞击以高速将颗粒状物质蒸发。为了保护着陆点周围的硬件，需要做大量的工作来了解着陆过程中羽流撞击的物理特性。虽然阿波罗登月舱着陆视频主要是定性的，但使用现代摄影测量技术可以提供丰富的定量信息。作者使用数字化视频来量化着陆排气对月球表面的羽流撞击效应。尘埃从羽流中喷出的角度估计为1-3度。放样粒子密度估计为10^8 ~ 10^13个粒子/m^3。此外，10-15厘米大小的大型物体的弹射和推力的弹射角度的依赖性的证据。目前正在进一步开展工作，继续对着陆录像进行定量分析。
英文摘要：
The Constellation Project's planned return to the moon requires numerous landings at the same site. Since the top few centimeters are loosely packed regolith, plume impingement from the Lander ejects the granular material at high velocities. Much work is needed to understand the physics of plume impingement during landing in order to protect hardware surrounding the landing sites. While mostly qualitative in nature, the Apollo Lunar Module landing videos can provide a wealth of quantitative information using modern photogrammetry techniques. The authors have used the digitized videos to quantify plume impingement effects of the landing exhaust on the lunar surface. The dust ejection angle from the plume is estimated at 1-3 degrees. The lofted particle density is estimated at 10^8 - 10^13 particles/m^3. Additionally, evidence for ejection of large 10-15 cm sized objects and a dependence of ejection angle on thrust are presented. Further work is ongoing to continue quantitative analysis of the landing videos.
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