Spectrum

Vis-NIR bidirectional reflectance spectrum of Calcite hydrothermal concretion powder (Massif Central, F), grain size inf. 25 µm

Title
Vis-NIR bidirectional reflectance spectrum of Calcite hydrothermal concretion powder (Massif Central, F), grain size inf. 25 µm
DOI
10.26302/SSHADE/EXPERIMENT_BS_20220803_001
Data reference
Schmitt, Bernard; Leclef, Apolline; Montagnac, Gilles (2021): Calcite: Vis-NIR and Mid-IR diffuse reflectance, MIR specular reflectance and Raman spectra of powders and blocks. SSHADE/DRIMS (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20220803_001
Experiment type
laboratory measurement
Type
reflectance factor
Intensity unit
no unit
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
cylindrical raw aluminium sample holders of various sizes for powders
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis, NIR
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 390.0 - 678.0 4.0 1.92 0.5
#2 682.0 - 1598.0 4.0 3.8 0.5
#3 1602.0 - 2834.0 4.0 7.65 0.8
#4 2842.0 - 4202.0 8.0 15.45 1.6
#5 4306.0 - 4650.0 8.0 15.45 1.6
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 several high frequency filters output of monochromator
Scan number
35
Comments
slit 600µm, resolution vary by up to $\pm2.5%$ over each spectral range
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
5.8°
Resolution observation
4.1°
Illumination
Observation
Comments
some wavelength dependent polarization
Observation mode
single spot
Resolutions
7.5 ${\pm}$ 0.2 $mm$
Comments
illumination with 9 fiber optic spots within 7.5 mm diameter, observation within an ellipse of 23x20 mm
Experiment
Calcite: Vis-NIR and Mid-IR diffuse reflectance, MIR specular reflectance and Raman spectra of powders and blocks
Date begin
2022-07-05
Release date
2024-06-09 15:59:28 UTC+0000
Version (Date)
#1 (2024-06-09 15:59:28 UTC+0000, Updated: 2024-07-10 17:41:11 UTC+0000)
History
Date Mode Version Status Comments
2022-08-19 19:39:50 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 (0.36-1.3 µm) and 2) with "Infragold" using its relative spectral reflectance (1.3-4.65 µm) scaled with Spectralon at 1.3 µm. The residual water vapor lines, around 1.12, 1.38, 1.87, 2.665 µm, have been partly corrected by a scaled water vapor transmission spectrum measured at same resolution and sampling + smooting residual in the 2.58-2.75 µm range. The badly corrected range of atmospheric $CO_2$ gas absorption (4.20-4.30 µm) has been removed.
Quality flag
4
Validator(s)