Spectrum

Vis-NIR reflectance spectrum of Beauregard pigment (PIG_0174_A_601), powder with grains < 160 µm, d=0.96 g/cm3

Title
Vis-NIR reflectance spectrum of Beauregard pigment (PIG_0174_A_601), powder with grains < 160 µm, d=0.96 g/cm3
DOI
10.26302/SSHADE/EXPERIMENT_BS_20200812_100
Data reference
Schmitt, Bernard; Chalmin-Aljanabi, Emilie; Chassin de Kergommeaux, Aurélie (2019): Vis-NIR reflectance spectra of Beauregard pigments (PIG_0174_A): raw blocks, powders, polished plot and painted matter. SSHADE/PIG (OSUG Data Center). Dataset/Spectral Data. https://doi.org/10.26302/SSHADE/EXPERIMENT_BS_20200812_100
Publications
Experiment type
laboratory measurement
Type
reflectance factor
Instrument
SHADOWS Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
cylindrical aluminium sample holders of various sizes for powder
Standard medium
vacuum
Observation mode
spectrum
Spectral range type(s)
Vis
Valid spectral range(s)
Min - Max ($nm$) Sampling ($nm$) Resolution ($nm$) Position accuracy ($nm$) Absorption edge
#1 402.0 - 422.0 4.0 4.85 0.5
#2 426.0 - 666.0 4.0 1.9 0.1
#3 670.0 - 998.0 4.0 3.8 0.2
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 several high frequency filters output of monochromator
Scan number
10
Comments
measured over the 362-998nm range. Flat 0.40-0.48nm range measured at 10nm and resampled at 4nm
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
5.2 ${\pm}$ 0.1 $mm$
Comments
illumination with 8 fiber optic spots within a 5.2 mm diameter, observation within an ellipse of 23x20 mm
Instrument
SHINE Spectro-Gonio bidirectional reflection Vis-NIR
Sample holder
cylindrical aluminium sample holders of various sizes for powder
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 1002.0 - 1426.0 4.0 3.8 0.2
#2 1430.0 - 3198.0 4.0 7.6 0.4
#3 3202.0 - 4186.0 8.0 15.5 0.8
Filters
Type Center/Edge ($nm$) Width ($nm$) Place
#1 several high frequency filters output of monochromator
Scan number
10
Comments
measured over the 602-4210nm 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
Vis-NIR reflectance spectra of Beauregard pigments (PIG_0174_A): raw blocks, powders, polished plot and painted matter
Date begin
2019-12-12
Date end
2020-02-27
Release date
2021-03-31 17:05:45 UTC+0000
Version (Date)
#1 (2021-03-31 17:05:45 UTC+0000, Updated: 2022-11-07 07:43:28 UTC+0000)
History
Date Mode Version Status Comments
2020-08-14 15:39:34 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 (0.36-1.35µm) and 2) with "Infragold" using its relative spectral reflectance (1.35-4.2µm). The visible spectrum (0.36-1µm) is scaled by a factor 0.90 (due to slightly different compaction and density of the 2 samples) and merged with the NIR spectrum (1-4.2µm). The residual water vapor lines, around 1.12, 1.38, 1.87, 2.665µm, have been corrected by multiplying by a scaled water vapor transmission spectrum measured at same resolution and sampling. A very slight smoothing (binomial over 3 points) has been applied. The almost flat 0.40-0.48µm part is interpolated from a lower sampling/resolution measurement (10nm interpolated at 4nm).
Quality flag
4
Validator(s)