High-resolution wind speed measurements using actively heated fiber optics
High-resolution wind speed measurements using actively heated fiber optics
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DOI：
10.1002/2015gl066729
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发表时间：
2015-11-28
影响因子：
5.2
通讯作者：
Selker, John
中科院分区：
文献类型：
--
作者：
Sayde, Chadi;Thomas, Christoph K.;Selker, John
我们提出了一种新技术，可以根据受热表面速度相关的传热测量，连续及时地同时测量数千个位置的风速 (U)。使用分布式温度传感系统测量成对的无源和有源加热光纤 (AHFO) 电缆之间的温差，可以估计沿 230 m 横断面的 2000 多个截面的 U（分辨率为 0.375 m 和 5.5 s）。基本概念类似于在太空中延伸的热线风速计。两个并置的声波风速计测量的 U 与 AHFO 之间的相关系数白天为 0.91，夜间为 0.87。经典被动式和新型 AHFO 的结合提供了对空间尺度 (0.1-1000 m) 4 个数量级的气温和风速的前所未有的动态观测，同时解决了单个湍流运动，为测试近地表地球物理流基础理论提供了新的机会。
We present a novel technique to simultaneously measure wind speed (U) at thousands of locations continuously in time based on measurement of velocity-dependent heat transfer from a heated surface. Measuring temperature differences between paired passive and actively heated fiber-optic (AHFO) cables with a distributed temperature sensing system allowed estimation of U at over 2000 sections along the 230 m transect (resolution of 0.375 m and 5.5 s). The underlying concept is similar to that of a hot wire anemometer extended in space. The correlation coefficient between U measured by two colocated sonic anemometers and the AHFO were 0.91 during the day and 0.87 at night. The combination of classical passive and novel AHFO provides unprecedented dynamic observations of both air temperature and wind speed spanning 4 orders of magnitude in spatial scale (0.1-1000 m) while resolving individual turbulent motions, opening new opportunities for testing basic theories for near-surface geophysical flows.