Spectroscopy and Spectral Analysis, Volume. 42, Issue 3, 847(2022)
Study on Directional Near-Infrared Reflectance Spectra of Typical Types of Coal
Fig. 1. Directional reflection platform and spectra acquisition diagram for coal
(a): Spherical coordinate device for directional reflection measurment; (b): Directional reflectance spectra acquisition diagram for coal
Fig. 2. Near-infrared spectral reflectance curves of No.1 anthracite under different azimuth angles (
(a):
Fig. 3. Near-infrared spectral reflectance curves of meager coal under different azimuth angles (
(a):
Fig. 4. Near-infrared spectral reflectance curves of gas coal under different azimuth angles (
(a):
Fig. 5. Near-infrared spectral reflectance curves of No.2 lignite under different azimuth angles (
(a):
Fig. 6. Polar nephograms of reflectance at characteristic wavelengths (
(a):
Fig. 7. Polar nephograms of reflectance at characteristic wavelengths (
(a):
Fig. 8. Polar nephograms of reflectance at characteristic wavelengths (
(a):
Fig. 9. Polar nephograms of reflectance at characteristic wavelengths (
(a):
Fig. 10. Regression curves of reflectance-reflection angle at characteristic wavelengths of No.1 anthracite
(a): Forward direction; (b): Backward direction
Fig. 11. Regression curves of reflectance-reflection angle at characteristic wavelengths of meager coal
(a): Forward direction; (b): Backward direction
Fig. 12. Regression curves of reflectance-reflection angle at characteristic wavelengths of gas coal
(a): Forward direction; (b): Backward direction
Fig. 13. Regression curves of reflectance-reflection angle at characteristic wavelengths of No.2 lignite
(a): Forward direction; (b): Backward direction
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En YANG, Shi-bo WANG. Study on Directional Near-Infrared Reflectance Spectra of Typical Types of Coal[J]. Spectroscopy and Spectral Analysis, 2022, 42(3): 847
Category: Orginal Article
Received: Jan. 19, 2021
Accepted: Mar. 1, 2021
Published Online: Apr. 19, 2022
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