NOX Box – NIR Reflectance Measurements

NOX NIR reflectance Measurements

The NOX is a NIR reflectance box  that enables the continuous observation of Up-welling and Down-welling radiance in the visible to near infrared region (1650nm). It measures spectral data of high resolution (approximately 3 nm), yet is built to withstand the hazards of a permanent outdoor installation.  It is fully autonomous in its operation, housed inside a rugged weatherproof case with low power consumption.

The NOX is an extension of the ROX system.  It is typically installed on tripods or towers with upward channel pointing at the sky and downward channel pointing at the target.   The NOX is specifically designed to measure radiance and reflectance under natural light conditions. Therefore the design is optimized to achieve maximum efficiency in terms of: Signal to Noise Ratio, Spectral Resolution and quick acquisition time. Different combination of spectrometers from Ocean Optics can be selected by the users (e.g. SR4, FLAME, QEpro for the visible range. FLAME-NIR or NIRquest for the NIR range).  It is a robust and flexible system suitable for numerous applications including vegetation canopy monitoring and monitoring of water quality, snow and ice.

NOX is saving raw data. To convert it into radiance and compute reflectance and a variety of vegetation indices, an open source R package is available. A graphical user interface makes the data processing easy for any customer to allow processing of years of data with a few clicks.

The basic NOX is equipped with a USB interface to stream data directly to a connected computer. The NOX is also able to pass a sub selection of variables (VIs and vital data) via SDI-12. The optional embedded PC, if connected to internet (LAN, WLAN, mobile network) will allow daily data stream of the full data set.

  • Field measurements of Spectral Reflectance from Vegetation.
  • Monitoring Plant Reflective Indices over wide range of irradiance (NDVI; PRI; MCARI; SRPI etc.)
  • Ground-truthing satellite data.
  • Cryosphere studies
  • Snow properties and melt prediction.
  • Water quality of lakes and rivers
  • Algal blooms


  • Wavelength range:   VIS-NIR: ~ 350-1100 nm (other options also available on demand)
  • Spectral Sampling Interval (SSI): ~ 0.7 nm
  • Spectral resolution (FWHM): ~ 3 nm
  • Signal to Noise Ratio (SNR): ~ 1000
  • Field Of View (FOV): Dual FOF – Upwelling radiance ~ 25°,Downwelling radiance 180°


  • Wavelength range:   ~ 900-1650 nm
  • Spectral Sampling Interval (SSI): ~ 1.5 nm
  • Spectral resolution (FWHM): ~ 3 nm
  • Signal to Noise Ratio (SNR): ~ 300
  • Field Of View (FOV):  Dual FOV – Upwelling radiance ~ 25°,Downwelling radiance 180°


  • Signal Optimization: Automatic adaption to varying light conditions
  • Dark current: Accurate 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 32 GB (12 months of measurements)
  • Case: Robust and Waterproof housing based on the 1510 Pelicase
  • Dimensions: 500 × 300 × 200 mm
  • Power supply: 12 Volt. From battery and solar panels
  • Power consumption: Average consumption of 60 Watt. (20/100 Watt, cooling on/o)
  • Energy saver: Day/night switch for energy saving
  • Interfaces: RS232 via cable and wireless – SDI-12


  • Dust Protection: Additional dust protection for Cosine Receptors
  • Fiber optics: Flexible length of fiber optics according to user needs
  • Communication Addon for LAN/WLAN/Mobile Network Remote access
NOX measuring field crop water content

Down-welling irradiance measurements

NOX down-welling irradiance

Up-welling irradiance measurements

NOX up-welling irradiance

Reflectance calculated form ratio of  up-welling and down-welling irradiance

NOX reflectance

NOX Installations

Contact Qubit Systems

To get your free manual and more information on this product.