Experiment
Title
Vis-NIR bidirectional reflection spectra of spherical water ice particles for different sizes (2 to 100 µm), temperatures (173 and 223 K) and temporal evolutions
DOI
10.26302/SSHADE/EXPERIMENT_OP_20171130_001
Data reference
Poch, Olivier; Yoldi, Zuriñe; Jost, Bernhard (2016): Vis-NIR bidirectional reflection spectra of spherical water ice particles for different sizes (2 to 100 µm), temperatures (173 and 223 K) and temporal evolutions. SSHADE/BYPASS+CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_OP_20171130_001
Type(s)
laboratory measurement
Description
Three types of water ice particles were prepared, having three grain size distributions: 4.5±2.5 µm, 67±31 μm, and between 2 and 100 µm. Reflectance spectra (from 0.4 to 4 µm) of 5mm-deep surfaces of these particles were measured at 173 K, and some at 223 K, under primary vacuum. During time, the particles undergo metamorphism (recristallisation/sintering, change of grains shape and size) and spectra were measured again several hours after the measurement of the fresh samples.
Number of spectra
9
Variable type(s)
  • sample grain size
  • temperature
  • sample texture
  • time
  • spectral range
Comments
During time, the ice particles undergo metamorphism (recristallisation/sintering, change of grains shape and size) and spectra were measured again several hours after the measurement of the fresh samples.
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Aluminum sample holder, cylindrical 48 mm diameter and 1 to 5mm depth closed by a sapphire window and cooled by a He cryostat in a vacuum chamber (Carbo-NIR)
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max (${\mu}m$) Sampling (${\mu}m$) Resolution (${\mu}m$) Position accuracy (${\mu}m$) Absorption edge
#1 0.7 - 2.02 0.02 0.024
#2 2.02 - 3.98 0.02 0.048
Filters
Type Center/Edge (${\mu}m$) Width (${\mu}m$) Place
#1 long-pass filters of the spectro-gonio radiometer
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
30.0°
Azimuth angle
0.0°
Phase angle
30.0°
Resolution illumination
0.1°
Resolution observation
4.1°
Illumination
Observation
Comments
partial polarization variable with wavelength (from monochromator grating)
Observation mode
single spot
Spatial resolution
20.0 $mm$
Date begin - end
2016-10-20 - 2016-10-25

Versions

Release date
2018-01-31 23:51:01 UTC+0000
Version (Date)
#1 (2017-12-02 22:41:42 UTC+0000, Updated: 2019-12-21 09:42:04 UTC+0000)
Sponsors
  • European Commission - Horizon 2020-RI (EC-H2020) (EPN2020-RI: Europlanet 2020 Research Infrastructure, grant No 654208 (TA2/DPSF/CSS/16-EPN2-026))