InfraSnow SSA Sensor:

The world’s first hand-held device to measure snow specific-surface-area (SSA):

The InfraSnow Sensor was developed in close collaboration with the Swiss Federal Institute for Snow and Avalanche Research (SLF) in Davos. This is the first hand-held device that can measure snow specific-surface-area (SSA) at fractional cost of existing bulky laboratory devices.

The method consists of diffuse near-infrared reflectance measurements using a compact integrating sphere setup to derive SSA. Diffuse reflectance is measured at NIR wavelengths, where impurities have only a weak influence on the reflectance of snow. For a sufficiently thick snow block, there exists a unique correlation between diffuse hemispherical reflectance and SSA according to multiple-scattering radiative transfer theory.

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Specifications

  • SSA range: 2.5 to 80 1/mm

  • Snow density range: 50 to 685 kg / m3

  • Measurement wavenlength: 945 nm

  • Battery run time: > 10 hrs

  • Temperature range: -25..+60 °C

  • Memory size: 325 samples

  • Battery: 3 x 1,5 V AAA cells

  • Data download: via USB

  • Display: 102 x 64 px with backlight

  • Measurement surface: 38 mm Sphere

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Literature

Gergely, M., Wolfsperger, F., and Schneebeli M., 2014: Simulation and Validation of the InfraSnow: An Instrument to Measure Snow Optically Equivalent Grain Size. IEEE Transactions on Geoscience and Remote Sensing.

Wolfsperger, F.; Rhyner, H.; Schneebeli, M., 2018: Pistenpräparation und Pistenpflege. Das Handbuch für den Praktiker. 232 p., WSL-Institut für Schnee- und Lawinenforschung SLF