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High-resolution wind speed measurements using actively heated fiber optics

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https://ir.library.oregonstate.edu/concern/articles/tq57nw66h

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Abstract
  • 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 230m transect (resolution of 0.375m 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.
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  • Sayde, C., Thomas, C. K., Wagner, J., & Selker, J. (2015). High‐resolution wind speed measurements using actively heated fiber optics. Geophysical Research Letters, 42(22), 10064-10073. doi:10.1002/2015GL066729
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  • 42
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  • 22
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  • This research was funded by the Army Research Office, contract W911NF-10-1-0361; the National Science Foundation, award AGS 0955444; and NASA, award NNX12AP58G. The fiber-optic instrument was provided by the Center for Transformative Environmental Monitoring Programs (CTEMPs) funded by the National Science Foundation, award EAR 0930061.
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file details SaydeChadiBioEcolEnginHigResolutionWindSpeed.pdf 2017-10-27 Público Descargar