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@ARTICLE{Brger:1017205,
      author       = {Börger, Kristian and Ellingham, Jennifer and Belt,
                      Alexander and Schultze, Thorsten and Bieder, Stefan and
                      Weckman, Elizabeth and Arnold, Lukas},
      title        = {{A}ssessing performance of {LEDSA} and {R}adiance method
                      for measuring extinction coefficients in real-scale fire
                      environments},
      journal      = {Fire safety journal},
      volume       = {141},
      issn         = {0378-7761},
      address      = {New York, NY [u.a.]},
      publisher    = {Elsevier},
      reportid     = {FZJ-2023-04016},
      pages        = {103929 -},
      year         = {2023},
      abstract     = {Two photometric measurement methods (Radiance method and
                      LEDSA) were compared against the established MIREX
                      measurement apparatus under controlled laboratory conditions
                      to assess their capability of measuring extinction
                      coefficients in real-scale fires on a temporal and spatial
                      scale. LEDSA is a tomographic technique based on direct
                      measurements of light intensity from individual LEDs using
                      commercially available DSLR cameras. By discretizing the
                      domain into horizontal layers with homogeneous smoke
                      density, values of the extinction coefficient can be
                      computed using an inverse model based on Beer Lambert’s
                      law. The Radiance method involves measuring the contrast of
                      light and dark areas in images and/or video footage. It was
                      originally developed to investigate the descent of the smoke
                      layer in high-temperature fire events. In this work, the
                      extinction coefficient was deduced from measurements on a
                      contrast board by a straightforward analytical approach.
                      Both methods were shown to yield similar extinction
                      coefficient results in line with the MIREX for an EN 54-7
                      TF5 n-heptane fire. The Radiance method is able to generate
                      accurate patterns but not values for a TF2 wood smouldering
                      fire, while LEDSA is generally able to reflect the MIREX
                      measurement values, yet requires higher computational
                      effort.},
      cin          = {IAS-7},
      ddc          = {690},
      cid          = {I:(DE-Juel1)IAS-7-20180321},
      pnm          = {5111 - Domain-Specific Simulation $\&$ Data Life Cycle Labs
                      (SDLs) and Research Groups (POF4-511)},
      pid          = {G:(DE-HGF)POF4-5111},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001072439000001},
      doi          = {10.1016/j.firesaf.2023.103929},
      url          = {https://juser.fz-juelich.de/record/1017205},
}