Spectral Coherence Along a Lidar-Anemometer Beam

Leif Kristensen, Peter Kirkegaard, Jakob Mann, Torben Mikkelsen, Morten Nielsen, Mikael Sjöholm

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    Abstract

    The theory of measuring the spectral coherence by means of a lidar anemometer has been outlined. It is based on the assumption that the turbulent velocity field can be considered statistically locally isotropic and on the validity of Taylor’s hypothesis. This implies that the longitudinal coherence cannot be predicted realistically. Special emphasis has been placed on the effect of line average along the beam. One section has been devoted to the effect of spectral aliasing, which may cause severe problems in the interpretation of measured data. This work is considered the theoretical background for the understanding of the coherences calculated on basis of real date.
    Original languageEnglish
    Place of PublicationRoskilde
    PublisherDanmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi
    Number of pages21
    ISBN (Print)978-87-550-3840-0
    Publication statusPublished - 2010
    SeriesDenmark. Forskningscenter Risoe. Risoe-R
    Number1744(EN)
    ISSN0106-2840

    Keywords

    • Wind power meteorology
    • Wind Energy
    • Risø-R-1744
    • Risø-R-1744(EN)

    Cite this

    Kristensen, L., Kirkegaard, P., Mann, J., Mikkelsen, T., Nielsen, M., & Sjöholm, M. (2010). Spectral Coherence Along a Lidar-Anemometer Beam. Danmarks Tekniske Universitet, Risø Nationallaboratoriet for Bæredygtig Energi. Denmark. Forskningscenter Risoe. Risoe-R, No. 1744(EN)