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@ARTICLE{Burkart:276578,
      author       = {Burkart, Andreas and Schickling, Anke and Mateo, Maria
                      Pilar Cendrero and Wrobel, Thomas Jan and Rossini, Micol and
                      Cogliati, Sergio and Julitta, Tommaso and Rascher, Uwe},
      title        = {{A} {M}ethod for {U}ncertainty {A}ssessment of {P}assive
                      {S}un-{I}nduced {C}hlorophyll {F}luorescence {R}etrieval
                      {U}sing an {I}nfrared {R}eference {L}ight},
      journal      = {IEEE sensors journal},
      volume       = {15},
      number       = {8},
      issn         = {1558-1748},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2015-06943},
      pages        = {4603 - 4611},
      year         = {2015},
      abstract     = {Measurements of sun-induced chlorophyll fluorescence (SIF)
                      over plant canopies provide a proxy for plant photosynthetic
                      capacity and are of high interest for plant research.
                      Together with spectral reflectance, SIF has the potential to
                      act as a noninvasive approach to quantify photosynthetic
                      plant traits from field to air and spaceborne scales.
                      However, SIF is a small signal contribution to the reflected
                      sunlight and often not distinguishable from sensor noise.
                      SIF estimation is, therefore, affected by an unquantified
                      uncertainty, making it difficult to estimate accurately how
                      much SIF is truly emitted from the plant. To investigate and
                      overcome this, we designed a device based on a spectrometer
                      covering the visible range and equipped it with an LED
                      emitting at the wavelength of SIF. Using this as a reference
                      and applying thorough calibrations, we present consistent
                      evidence of the instrument's capability of SIF retrieval and
                      accuracy estimations. The LED's intensity was measured under
                      sunlight with 1.27 ± 0.27 mW × sr-1m-2nm-1 stable over the
                      day. The large increase of SIF due to the Kautsky effect was
                      measured spectrally and temporally proving the biophysical
                      origin of the signal. We propose rigorous tests for
                      instruments intended to measure SIF and show ways to further
                      improve the presented methods.},
      cin          = {IBG-2},
      ddc          = {620},
      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:000357802000053},
      doi          = {10.1109/JSEN.2015.2422894},
      url          = {https://juser.fz-juelich.de/record/276578},
}