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Distributed observations of wind direction using microstructures attached to actively heated fiber-optic cables

DOI zum Zitieren der Version auf EPub Bayreuth: https://doi.org/10.15495/EPub_UBT_00005136
URN to cite this document: urn:nbn:de:bvb:703-epub-5136-3

Title data

Lapo, Karl ; Freundorfer, Anita ; Pfister, Lena ; Schneider, Johann ; Selker, John ; Thomas, Christoph:
Distributed observations of wind direction using microstructures attached to actively heated fiber-optic cables.
In: Atmospheric Measurement Techniques. Vol. 13 (2020) Issue 3 . - pp. 1563-1573.
ISSN 1867-8548
DOI der Verlagsversion: https://doi.org/10.5194/amt-13-1563-2020

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Project information

Project title:
Project's official titleProject's id
ERC Consolidator Grant DarkMix724629
Open Access PublizierenNo information

Project financing: Andere
European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme

Related research data

Abstract

The weak-wind boundary layer is characterized by turbulent and submesoscale motions that break the assumptions necessary for using traditional eddy covariance observations such as horizontal homogeneity and stationarity, motivating the need for an observational system that allows spatially resolving measurements of atmospheric flows near the surface. Fiber-optic distributed sensing (FODS) potentially opens the door to observing a wide range of atmospheric processes on a spatially distributed basis and to date has been used to resolve the turbulent fields of air temperature and wind speed on scales of seconds and decimeters. Here we report on progress developing a FODS technique for observing spatially distributed wind direction. We affixed microstructures shaped as cones to actively heated fiber-optic cables with opposing orientations to impose directionally sensitive convective heat fluxes from the fiber-optic cable to the air, leading to a difference in sensed temperature that depends on the wind direction. We demonstrate the behavior of a range of microstructure parameters including aspect ratio, spacing, and size and develop a simple deterministic model to explain the temperature differences as a function of wind speed. The mechanism behind the directionally sensitive heat loss is explored using computational fluid dynamics simulations and infrared images of the cone-fiber system. While the results presented here are only relevant for observing wind direction along one dimension, it is an important step towards the ultimate goal of a full three-dimensional, distributed flow sensor.

Further data

Item Type: Article in a journal
Keywords: Distributed Temperature Sensing; Turbulence; Heat Transfer; Turbulence Kinetic Energy; Wind Direction; Wind Speed
DDC Subjects: 500 Science
500 Science > 550 Earth sciences, geology
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology > Professor Micrometeorology - Univ.-Prof. Dr. Christoph K. Thomas
Profile Fields > Advanced Fields > Ecology and the Environmental Sciences
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Micrometeorology
Profile Fields
Profile Fields > Advanced Fields
Language: English
Originates at UBT: Yes
URN: urn:nbn:de:bvb:703-epub-5136-3
Date Deposited: 26 Oct 2020 11:30
Last Modified: 02 Nov 2020 06:42
URI: https://epub.uni-bayreuth.de/id/eprint/5136

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