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@ARTICLE{Wunderle:185938,
      author       = {Wunderle, K. and Rascher, U. and Pieruschka, R. and Schurr,
                      U. and Ebert, V.},
      title        = {{A} new spatially scanning 2.7 µm laser hygrometer and new
                      small-scale wind tunnel for direct analysis of the
                      {H}$_{2}${O} boundary layer structure at single plant
                      leaves},
      journal      = {Applied physics / B},
      volume       = {118},
      number       = {1},
      issn         = {1432-0649},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {FZJ-2015-00062},
      pages        = {11 - 21},
      year         = {2015},
      abstract     = {A new spatially scanning TDLAS in situ hygrometer based on
                      a 2.7-µm DFB diode laser was constructed and used to
                      analyse the water vapour concentration boundary layer
                      structure at the surface of a single plant leaf. Using an
                      absorption length of only 5.4 cm, the TDLAS hygrometer
                      permits a H2O vapour concentration resolution of 31 ppmv.
                      This corresponds to a normalized precision of 1.7 ppm m. In
                      order to preserve and control the H2O boundary layer on an
                      individual leaf and to study the boundary layer dependence
                      on the wind speed to which the leaf might be exposed in
                      nature, we also constructed a new, application specific,
                      small-scale, wind tunnel for individual plant leaves. The
                      rectangular, closed-loop tunnel has overall dimensions of
                      1.2 × 0.6 m and a measurement chamber dimension of 40 × 54
                      mm (H × W). It allows to generate a laminar flow with a
                      precisely controlled wind speed at the plant leaf surface.
                      Combining honeycombs and a miniaturized compression orifice,
                      we could generate and control stable wind speeds from 0.1 to
                      0.9 m/s, and a highly laminar and homogeneous flow with an
                      excellent relative spatial homogeneity of 0.969 ± 0.03.
                      Combining the spectrometer and the wind tunnel, we analysed
                      (for the first time) non-invasively the wind speed-dependent
                      vertical structure of the H2O vapour distribution within the
                      boundary layer of a single plant leaf. Using our
                      time-lag-free data acquisition procedure for phase locked
                      signal averaging, we achieved a temporal resolution of 0.2 s
                      for an individual spatial point, while a complete vertical
                      spatial scan at a spatial resolution of 0.18 mm took 77 s.
                      The boundary layer thickness was found to decrease from 6.7
                      to 3.6 mm at increasing wind speeds of 0.1–0.9 m/s.
                      According to our knowledge, this is the first experimental
                      quantification of wind speed-dependent H2O vapour boundary
                      layer concentration profiles of single plant leaves.},
      cin          = {IBG-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {582 - Plant Science (POF3-582)},
      pid          = {G:(DE-HGF)POF3-582},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000347247700003},
      doi          = {10.1007/s00340-014-5948-1},
      url          = {https://juser.fz-juelich.de/record/185938},
}