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FloX

FloX is an automated field spectroscopy device capable of collecting unattended, continuous, long-term measurements of sun-induced chlorophyll fluorescence.

The FloX was developed by the IBG-2: Plant Sciences of the Jülich Research Center and the Remote Sensing of Environmental Dynamics Laboratory of the University Milano-Bicocca. In 2015, two members of the partners founded the new start-up company JB Hyperspectral. The commercial versions of the FloX Boxes are distributed by this young start-up company.
FloX is measuring the sun-induced chlorophyll fluorescence (SIF) of plant canopies as a measure of plant photosynthetic capacity under natural light conditions. A QEPro spectrometer from Ocean Optics covering the Red/Near Infrared region (650 – 800 nm) measures chlorophyll fluorescence of plant canopies in the wavelength region of the two atmospheric oxygen absorption bands, O2B and O2A (689 nm and 760 nm, respectively), with a high spectral resolution. SIF of plant canopies can be constantly monitored by the comparison of sequential measurements of light reflected and emitted from the plant canopy using a downward fiberoptics and solar irradiance using an upward directed reference fiberoptics. In addition, an Ocean Optics Flame spectrometer measures spectral reflectance in the visible and near-infrared region (400–950 mn). The spectrometers are embedded in a temperature controlled housing to maintain a stable level of dark current of the spectrometers. An accurate automatic optimization of the measurement duration of both channels to prevailing light conditions is applied to maximize the signal-to-noise ratio and minimize acquisition time. Thereby, FloX can be used to constantly monitor SIF under changing environmental conditions.
Currently, three FloX devices are available at IBG-2.

 FLOXbox_2

 FLOXbox_1

In cooperation with: JB Hyperspectral Devices


Responsible People (IBG-2): Laura Junker-Frohn and Uwe Rascher

Related Literature

Burkart A., Schickling A.; Pilar Cendrero Mateo M., Wrobel T.; Rossini M., Cogliati S., Julitta T. & Rascher, U. (2015) A method for uncertainty assessment of passive sun-induced chlorophyll fluorescence retrieval by using an infrared reference light, IEEE Sensors, 15, 4603-4611.

Cogliati S., Rossini M. Julitta T.; Meroni, M. Schickling A., Burkart A., Pinto F., Rascher U. & Colombo R. (2015) Continuous and long-term measurements of reflectance and sun-induced chlorophyll fluorescence by using novel automated field spectroscopy systems. Remote Sensing of Environment, 164, 270-281.

Rossini M., Meroni M., Celesti M., Cogliati S., Julitta T., Panigada C., Rascher U., van der Tol C. & Colombo R. (2016) Analysis of red and far-red sun-induced chlorophyll fluorescence and their ratio in different canopies based on observed and modeled data. Remote Sensing, 8, article no. 412; doi: 10.3390/rs8050412


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