Vis-NIR bidirectional reflectance spectrum of Calcite stalactite
- Title
- Vis-NIR bidirectional reflectance spectrum of Calcite stalactite
- 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
- Database
- Experimentalists
- 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 4314.0 - 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
- linearly interpolated in the 4210-4306 range
Definition: incidence and emergence angles are positive with origin at nadir, and vary in same direction. Azimuth origin (increasing clockwise) is for i = e (opposition geometry).
- 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
- Name
- Calcite stalactite
- Comments
- calcite possibly containing other minerals and large amount of adsorbed or absorbed water
- Experiment
- Calcite: Vis-NIR and Mid-IR diffuse reflectance, MIR specular reflectance and Raman spectra of powders and blocks
- Date begin
- 2022-02-10
- 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 badly corrected range of atmospheric $CO_2$ gas absorption (4.20-4.31 µm) has been corrected by interpolation.
- Quality flag
- 4
- Validator(s)
