FLOX (FLuorescence bOX)

FloX System

FloX system

FLOX is an automated field spectroscopy device capable of collecting unattended, continuous, long-term hyperspectral measurements.

It represents the evolution of prototypes such as Multiplexer Radiometer Irradiometer (MRI) [1]SFLUOR box [1] and SIF-System [2] developed from a collaboration between Jülich Research Center and the Remote Sensing of Environmental Dynamics Laboratory of the University Milano Bicocca. The basic routines of FLOX are based on SPECY (Forschungszentrum Jülich, IBG-2: Plant Sciences).

FLOX is specifically designed to passively measure Chlorophyll fluorescence induced by sun, under natural light conditions. Therefore the design is optimized in order to achieve maximum efficiency in terms of: Signal to Noise Ratio, Spectral Resolution and quick acquisition time. The core of the system is the QEPro spectrometer from Ocean Optics covering the Red/Near Infrared region (650 – 800 nm). This is the spectral range where Chlorophyll fluorescence is emitted and where the two atmospheric oxygen absorption bands (O2B and O2A, at 689 nm and 760 nm respectively) can be used to measure it. Upward and downward channels of FLOX allow to sequentially measure the solar irradiance and the reflected radiance from the canopy.  In order to keep a stable level of dark current the spectrometers are embedded in a temperature controlled housing. The signal-to-noise is maximized thanks to accurate automatic optimization of the signal of both channels.

For more information about FLOX Specifications download the product info.


Wavelength range 650—800 nm
Spectral Sampling Interval (SSI) 0.17 nm
Spectral resolution (FWHM) 0.3 nm
Signal to Noise Ratio (SNR) 1000
Field Of View (FOV) Dual FOV. Upwelling radiance 25°. Downwelling radiance 180°
Signal Optimization Automatic adaption to varying light conditions
Dark current Accurate dark current determination at each measurement cycle
Manual acquisition Interface software for manual measurement and calibration
Automatic acquisition Fully autonomous measurement mode for unattended data acquisition
Quick measurements 20 seconds under bright sunshine 60 seconds in overcast conditions
Stability Reference system stability check and uncertainty estimates
Simultaneous metadata Spectrometer temperature, Outside temperature, GPS position, GPS time
Data Display Live assessment of the systems status
Data storage SD card up to 64 GB (12 months of measurements)
Case Robust and Waterproof housing based on the 1510 Pelicase
Dimension Small form factor (50 x 30 x 20 cm) suitable as plane hand luggage
Power supply 12 Volt. From battery and solar panels
Power consumption Average consumption of 60 Watt. (20 / 100 Watt, cooling on / off)
Energy saver Day/night switch for energy saving
Second spectrometer Additional spectrometer covering Visible Near Infrared or Shortwave Infrared
Fiber optics Flexible length of fiber optics according to user needs
Field use Backpack option including small battery packs

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