Compact Probe for In-Situ Optical Snow Grain Size Stratigraphy

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Presentation transcript:

Compact Probe for In-Situ Optical Snow Grain Size Stratigraphy Dan Berisford, Noah Molotch, Michael Durand, Thomas H. Painter

Traditional Grain Size Measurement Hand lens grain size estimation

Radiative transfer from hand lens Painter et al., Journal of Glaciology 2007

Traditional Grain Size Measurement Reference!!!

Contact Spectroscopy Advantages Less subjective Repeatable Faster Data applicable to remote sensing Painter et al., Journal of Glaciology 2007

Contact Spectroscopy optical equivalent grain size obtained by integrating absorption feature and comparing to RT model Painter et al., 2007; Nolin and Dozier, 2000.

Spectral Profiler Probe sleeve reflectance probe drive tube fiber Send optics down bore hole Lateral reflectance spectra Fiber optic sends signal to surface No snowpit!

fiber optic to spectrometer drive tube probe carrier body spectral reflectance probe optical inspection camera aluminum sleeve with machined slits for lateral viewing nylon brush

drive tube fiber optic to spectrometer thumb screw clamp base plate aluminum sleeve section

Spectral Profiler Probe Hardware fiber optic to spectrometer base plate aluminum sleeve drive tube reflectance probe clamp

Spectral Profiler Probe Hardware optical inspection camera spectral reflectance probe nylon brush In-bore light source

on off 2 configurations In-bore fiber light light spectrometer light source light source on off

Probe stowed for transport

Field Testing spectrometer tarp to block sunlight

Field testing

Niwot Ridge April 2010 results

Niwot Ridge April 2010 results

Storm Peak Lab Feb 2010 results

Future Work miniaturize probe add density measurement algorithm for on-site grain size retreval take measurements over large geographic area

Acknowledgements Alex Arnsten Jennifer Petrzelka Part of this work was performed at the Jet Propulsion Laboratory/California Institute of Technology under contract from NASA.

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