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

2. Traditional Grain Size Measurement
Hand lens grain size estimation

3. Traditional Grain Size Measurement
Reference!!!

4. Contact Spectroscopy Advantages Less subjective Repeatability Faster
Data applicable to remote sensing
Reference?

5. Contact Spectroscopy optical equivalent grain size
obtained by integrating absorption feature and comparing to RT model
Reference!!

6. 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!

7. 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

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

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

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

11. 2 configurations on off In-bore fiber light light spectrometer
light source
light source on
off

12. Probe stowed for transport

13. Field Testing
spectrometer
tarp to block sunlight

14. Field testing

15. Niwot Ridge April 2010 results

16. Niwot Ridge April 2010 results

17. Storm Peak Lab Feb 2010 results

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

19. Acknowledgements Noah Molotch Mike Durand Tom Painter Alex Arnsten
Jennifer Petrzelka

20. supplemental