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@PHDTHESIS{Prahl:780551,
      author       = {Prahl, Philipp Christoph},
      othercontributors = {Pitz-Paal, Robert and Maas, Hans-Gerd},
      title        = {{P}hotogrammetric measurement of the optical performance of
                      parabolic trough solar fields},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2020-00720},
      pages        = {1 Online-Ressource (xxiii, 184 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2019},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2020; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2019},
      abstract     = {Renewable energies are characterized by deviations between
                      demand and supply. Concentrating solar power (CSP) offers
                      not only the efficient and potentially competitive use of
                      sunlight, but also the use of thermal energy storage, in
                      order to cope with these fluctuations. Various technologies
                      are available for the concentration and conversion of
                      sunlight into thermal energy, with parabolic trough
                      collector (PTC) having the largest market share at the time.
                      The optical efficiency of the solar field has a significant
                      influence on the economic viability of the power plant.
                      Measurement methods for determining the geometric accuracy
                      of concentrator systems are therefore an important part of
                      research $\&$ development, construction, commissioning and
                      running operation. This thesis describes the development of
                      the airborne QFly measurement technique for the
                      qualification of PTC solar fields. Compared to the state of
                      the art, the stationary camera has been replaced by a
                      unmanned aerial vehicle (UAV) with corresponding payload.
                      This allows a fully automatic measurement of the entire
                      power plant. The QFly procedure has two approaches. The
                      QFlyHighRes approach allows the precise and differentiated
                      measurement of concentrator geometry at a spatial resolution
                      of 6mm/pixel and a flight altitude of 30 meters. The
                      measurement volume is approx. 2 loops per day and is
                      therefore suitable for the characterization of prototypes
                      and random check of the solar field. The QFly Survey method
                      is used for the rapid screening of entire power plants. At a
                      flight altitude of 120 to 250 meters, tracking information
                      and the effective concentrator form can be obtained at a
                      reduced spatial resolution. Within the scope of this work,
                      both methods are described and subjected to an uncertainty
                      analysis and validated with independent benchmark
                      measurement methods. In the end, the process is used to
                      identify defects with the aid of geometric measured data.
                      Numerical ray-tracing (RT) enables an energetic and economic
                      evaluation of potential optimization measures. The airborne
                      geometry measurement in parabolic trough power stations can
                      thus be regarded as mature. Further need for action and
                      possible applications arise with the interface with the
                      yield analysis, the airborne thermographic determination of
                      heat losses and the extension of the measuring technology on
                      solar tower power plants.},
      cin          = {412910},
      ddc          = {620},
      cid          = {$I:(DE-82)412910_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2020-00720},
      url          = {https://publications.rwth-aachen.de/record/780551},
}