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
- Spectroscopy and Spectral Analysis
- Vol. 42, Issue 3, 847 (2022)
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
(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 (φ )
(a):φ =0°; (b): φ =45°; (c): φ =90°; (d): φ =135°; (e): φ =180°
(a):
Fig. 3. Near-infrared spectral reflectance curves of meager coal under different azimuth angles (φ )
(a):φ =0°; (b): φ =45°; (c): φ =90°; (d): φ =135°; (e): φ =180°
(a):
Fig. 4. Near-infrared spectral reflectance curves of gas coal under different azimuth angles (φ )
(a):φ =0°; (b): φ =45°; (c): φ =90°; (d): φ =135°; (e): φ =180°
(a):
Fig. 5. Near-infrared spectral reflectance curves of No.2 lignite under different azimuth angles (φ )
(a):φ =0°; (b): φ =45°; (c): φ =90°; (d): φ =135°; (e): φ =180°
(a):
Fig. 6. Polar nephograms of reflectance at characteristic wavelengths (λ ) of No.1 anthracite
(a):λ =1 400 nm; (b): λ =1 700 nm; (c): λ =1 900 nm; (d): λ =2 200 nm; (e): λ =2 300 nm
(a):
Fig. 7. Polar nephograms of reflectance at characteristic wavelengths (λ ) of meager coal
(a):λ =1 400 nm; (b): λ =1 700 nm; (c): λ =1 900 nm; (d): λ =2 200 nm; (e): λ =2 300 nm
(a):
Fig. 8. Polar nephograms of reflectance at characteristic wavelengths (λ ) of gas coal
(a):λ =1 400 nm; (b): λ =1 700 nm; (c): λ =1 900 nm; (d): λ =2 200 nm; (e): λ =2 300 nm
(a):
Fig. 9. Polar nephograms of reflectance at characteristic wavelengths (λ ) of No.2 lignite
(a):λ =1 400 nm; (b): λ =1 700 nm; (c): λ =1 900 nm; (d): λ =2 200 nm; (e): λ =2 300 nm
(a):
Fig. 10. Regression curves of reflectance-reflection angle at characteristic wavelengths of No.1 anthracite
(a): Forward direction; (b): Backward direction
(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
(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
(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
(a): Forward direction; (b): Backward direction
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Table 1. Main compositions of the four typical coal samples
Set citation alerts for the article
Please enter your email address
© Copyright 2018-2021 | Chinese Laser Press. All Rights Reserved 沪ICP备15018463号-20