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@ARTICLE{Hunsmann:61239,
      author       = {Hunsmann, S. and Wunderle, K. and Wagner, S. and Rascher,
                      U. and Schurr, U. and Ebert, V.},
      title        = {{A}bsolute, high resolution water transpiration rate
                      measurements on single plant laaves via tunable diode laser
                      absorption spectroscopy ({TDLAS}) at 1.37 µm},
      journal      = {Applied physics / B},
      volume       = {92},
      issn         = {0946-2171},
      address      = {Berlin},
      publisher    = {Springer},
      reportid     = {PreJuSER-61239},
      pages        = {393 - 401},
      year         = {2008},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {A new sampling-free and calibration-free multi-channel
                      hygrometer using near infrared (NIR) tunable diode laser
                      absorption spectroscopy (TDLAS) at 1.37 mu m was developed
                      and used to determine absolute transpiration rates of single
                      plant leafs. Four 8 x 6 x 4 cm(3), fiber-coupled absorption
                      cells are used to simultaneously measure absolute water
                      vapor concentrations with an absolute accuracy of about
                      $5\%$ and a temporal resolution of about 2 s. Two chambers
                      (BOTTOM, TOP) are directly attached to the leaf surface,
                      while two chambers (IN, OUT) analyze the purge gas supplied
                      to the plant leaf and the total outflow of the leaf
                      chambers. The BOTTOM-TOP comparison provided a direct,
                      leaf-side resolved ratio of stomatal conductance and-by
                      taking into account the purge gas flow and the leaf area
                      exposed-leaf side resolved water transpiration rates. The
                      OUT-IN-difference yielded the total leaf transpiration rate
                      with 2 mu mol/m(2)/s resolution. The new multi-point
                      hygrometer was validated by monitoring of the transpiration
                      dynamics of a plant of the species Epipremnum pinnatum (L.)
                      Engl. during diurnal variation of the leaf irradiation.
                      During these experiments the differential H2O concentration
                      resolution between two chambers was determined to be better
                      than 3 ppm at Delta t = 2s (i.e. better than 711 ppb m
                      Hz(1/2)). This performance was verified by an Allan analysis
                      over a 30 min time period using CH4 as a surrogate absorber
                      and yielded an average optimum optical resolution of 4.9 x
                      10(-6) for 83 s measurement time, i.e. a CH4 resolution of
                      892 ppb, which corresponds to the optical resolution needed
                      for a water sensitivity of 454 ppb m Hz(1/2).},
      keywords     = {J (WoSType)},
      cin          = {ICG-3 / JARA-ENERGY},
      ddc          = {530},
      cid          = {I:(DE-Juel1)ICG-3-20090406 / $I:(DE-82)080011_20140620$},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Optics / Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000258703600012},
      doi          = {10.1007/s00340-008-3095-2},
      url          = {https://juser.fz-juelich.de/record/61239},
}