Spectrum

Near-infrared reflectance spectra of Struvite powder at 80K (up) with 32-80 µm grain sizes

Title
Near-infrared reflectance spectra of Struvite powder at 80K (up) with 32-80 µm grain sizes
DOI
10.26302/SSHADE/EXPERIMENT_BS_20201114_010
Data reference
Fastelli, Maximiliano; Comodi, Paola; Schmitt, Bernard; Beck, Pierre; Poch, Olivier (2020): Near-infrared reflectance spectra at low temperature (300-80K) of Struvite [(NH4)MgPO4·6(H2O)] powders with three grain size ranges (32-80, 80-125 and 125-150µm). SSHADE/CSS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20201114_010
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Intensity unit
no unit
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
Cylindrical aluminum sample holder placed in the isothermal CarboN-IR cryogenic cell with two saphire windows. For the measurements at room temperature the two windows are removed.
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 1000.0 - 1600.0 10.0 7.7 1.0
#2 1610.0 - 2830.0 10.0 15.5 1.5
#3 2840.0 - 3200.0 10.0 30.0 3.0
#4 3220.0 - 4180.0 20.0 30.0 3.0
#5 4340.0 - 4800.0 20.0 30.0 3.0
Scan number
20
Comments
A series of high pass filters is used to remove high orders of the gratings
Observation geometry
bidirectional
Observation mode
fixed angles
Incidence angle
0.0°
Emergence angle
20.0°
Azimuth angle
0.0°
Phase angle
20.0°
Resolution illumination
5.8°
Resolution observation
4.1°
Comments
'Gognito' illumination attachment with focused beam.
Illumination
Observation
Comments
Partial polarization variable with wavelength (from the 3 monochromator gratings used)
Observation mode
single spot
Resolutions
7.5 $mm$
Experiment
Near-infrared reflectance spectra at low temperature (300-80K) of Struvite [(NH4)MgPO4·6(H2O)] powders with three grain size ranges (32-80, 80-125 and 125-150µm)
Date begin
2020-11-17 23:16:00
Release date
2022-04-23 08:18:25 UTC+0000
Version (Date)
#1 (2022-04-23 08:18:25 UTC+0000, Updated: 2022-04-23 08:18:25 UTC+0000)
History
Date Mode Version Status Comments
2021-01-16 14:03:15 UTC+0000 first import #1 valid version
Analysis
Raw bidirectional reflectance spectrum calibrated: 1) with "Spectralon 99%" measured under same geometry using its absolute BRDF (1000-1300nm) and 2) with "Infragold" using its relative spectral reflectance (1300-4800nm). The multiple reflections from the two saphire windows of the cell are corrected by a calibration function taking into account the sample surface reflectance. No residual water vapor line is observed.
Quality flag
4
Validator(s)