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相关概念视频

Boundary Layer Characteristics01:18

Boundary Layer Characteristics

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When a fluid encounters a solid surface, a boundary layer forms due to the interaction between the fluid's motion and the stationary surface. This phenomenon is characterized by a thin region adjacent to the surface where viscous forces dominate, influencing the fluid's velocity profile. The development of the boundary layer begins at the leading edge of the surface and evolves as the fluid moves downstream.As the fluid flows over the surface, friction between the fluid and the wall slows down...
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Doppler Effect - II01:05

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The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...
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Measuring Spray Droplet Size from Agricultural Nozzles Using Laser Diffraction
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使用连贯多普勒风力激光器检索气溶反散系数.

Tianwen Wei, Mengya Wang, Pu Jiang

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    此摘要是机器生成的。

    脉冲连贯多普勒风激光雷达 (CDWL) 现在可以在风力测量的同时检索气溶的光学特性. 本研究详细介绍了校准和错误分析,改进了气溶传输和雾监测数据.

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    科学领域:

    • 大气科学 大气科学
    • 遥感 遥感 遥感 遥感
    • 光学物理学的光学物理学

    背景情况:

    • 连贯多普勒风力激光器 (CDWL) 是风力分析的一个关键工具.
    • 使用CDWL检索气溶的光学特性是具有挑战性的,因为流和光束聚焦.
    • 准确的气溶光学属性数据对于大气研究至关重要.

    研究的目的:

    • 综合评估脉冲CDWL的功能和局限性,以检索气溶回散/灭绝系数的配置.
    • 引入和验证望远镜焦点功能的自我校准方法.
    • 分析气溶光学属性检索中的关键不确定性来源.

    主要方法:

    • 使用水平观测对望远镜焦点功能的自我校准.
    • 审查前进和后退检索方法 (有/没有辅助测量).
    • 从载体与噪声比率 (CNR),异质效率,激光雷达常数和激光雷达比率的不确定性分析.

    主要成果:

    • 望远镜焦点的自我校准方法得到了验证.
    • 利达恒定的不确定性在1550nm处在15%以内,随波长而增加.
    • 假设激光雷达比率错误对灭绝系数的检索有很大影响,但对回散系数的影响较小.

    结论:

    • 控制的系统环境对于稳定的异质效率至关重要.
    • 脉冲CDWL可以提供有价值的气溶光学性能数据,增强大气运输和雾监测.
    • 同时测量风和气溶性能将丰富各种大气应用的数据集.