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@ARTICLE{Kneer:1009730,
      author       = {Kneer, Caspar and Burkart, Andreas and Bongartz, Jens and
                      Siegmann, Bastian and Bendig, Juliane and Jenal, Alexander
                      and Rascher, Uwe},
      title        = {{A} {S}napshot {I}maging {S}ystem for the {M}easurement of
                      {S}olar-induced {C}hlorophyll {F}luorescence –
                      {A}ddressing the {C}hallenges of {H}igh-performance
                      {S}pectral {I}maging},
      journal      = {IEEE sensors journal},
      volume       = {23},
      number       = {19},
      issn         = {1530-437X},
      address      = {New York, NY},
      publisher    = {IEEE},
      reportid     = {FZJ-2023-02954},
      pages        = {23255 - 23269},
      year         = {2023},
      abstract     = {This article introduces a novel stereo-camera system for
                      the measurement of solar-induced chlorophyll fluorescence
                      (SIF) at 760 nm. The instrument uses optical interference
                      filters to gain high background radiation-suppression in the
                      telluric oxygen absorption band at 760 nm, to measure the
                      weak SIF signal. Featuring spatially high-resolution images
                      and a lightweight setup, the system was built for ground-
                      and drone-based field applications. The technical setup of
                      the device and the used methodology are presented as well as
                      a theoretical performance simulation, indicating a maximal
                      reduction of background radiation by a factor of five.
                      Experimental results show that steady-state fluorescence can
                      be measured with signal to noise ratios between five and
                      ten, depending on saturation level of the sensor and
                      aperture settings of the lens. Intensity changes lower than
                      0.2 mWm -2 sr -1 nm -1 , emitted by a calibrated light
                      emitting diode (LED) reference panel, can be reliably
                      distinguished under direct sun illumination. The system’s
                      capability to detect fast changes in photosynthetic
                      dynamics, with both high spatial and temporal resolution, is
                      demonstrated by a video sequence of a leaf during dark-light
                      transition. In a static, platform-based operation, the
                      classification of fluorescent and non-fluorescent surfaces
                      under natural conditions is presented.},
      cin          = {IBG-2},
      ddc          = {004},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001087769200110},
      doi          = {10.1109/JSEN.2023.3297054},
      url          = {https://juser.fz-juelich.de/record/1009730},
}