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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2019-63
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-63
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

  12 Mar 2019

12 Mar 2019

Review status
A revised version of this preprint was accepted for the journal AMT and is expected to appear here in due course.

Wind speed measurements using distributed fiber optics: a windtunnel study

Justus G. V. van Ramshorst1,4, Miriam Coenders-Gerrits1, Bart Schilperoort1, Bas J. H. van de Wiel2, Jonathan G. Izett2, John S. Selker3, Chad W. Higgins3, Hubert H. G. Savenije1, and Nick C. van de Giesen1 Justus G. V. van Ramshorst et al.
  • 1Delft University of Technology, Water Resources Section, Stevinweg 1, 2628 CN Delft, the Netherlands
  • 2Delft University of Technology, Geoscience and Remote Sensing, Stevinweg 1, 2628 CN Delft, the Netherlands
  • 3Oregon State University, Biological and Ecological Engineering, 116 Gilmore Hall, Corvallis, Oregon 97331, USA
  • 4University of Göttingen, Bioclimatology, Büsgenweg 2, 37077 Göttingen, Germany

Abstract. Near-surface wind speed is typically only measured by point observations. The Actively Heated Fiber-Optic (AHFO) technique, however, has the potential to provide high-resolution distributed observations of wind speeds, allowing for better characterization of fine-scale processes. Before AHFO can be widely used, its performance needs to be tested in a range of settings. In this work, experimental results on this novel observational wind-probing technique are presented. We utilized a controlled wind-tunnel setup to assess both the accuracy and the precision of AHFO under a range of operational conditions. The technique allows for wind speed characterization with a spatial resolution of 0.3 m on a 1 s time scale. The flow in the wind tunnel was varied in a controlled manner, such that the mean wind, ranged between 1 and 17 m/s. The AHFO measurements are compared to sonic anemometer measurements and show a high overall correlation (0.85–0.98). Both the precision and accuracy of the AHFO measurements were also greater than 95 %. We conclude that the AHFO has potential to be employed as an outdoor observational technique. It allows for characterization of spatially varying fields of mean wind in complex terrain, such as in canopy flows or in sloping terrain. In the future, the technique could be combined with conventional Distributed Temperature Sensing (DTS) for turbulent heat flux estimation in micrometeorological/hydrological applications.

Justus G. V. van Ramshorst et al.

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Justus G. V. van Ramshorst et al.

Justus G. V. van Ramshorst et al.

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Short summary
Inside a wind tunnel we tested a novel measurement technique to measure wind speed. Our device can measure wind speed not only at one place, but it measures the wind speed along a fiber optic cable. This cable can be more then 1km in length and give thousands of measurements at once, which is interesting for locations/situations were the wind is not constant in space. Finally, we propose a method to estimate the precision which helps in designing future (outdoor) experiments.
Inside a wind tunnel we tested a novel measurement technique to measure wind speed. Our device...
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