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Lecture 9: Spectroscopy
Lecture 9: Spectroscopy
What was covered in the previous lecture
What was covered in the previous lecture
Discussion: 1) reflection/refraction of light from surfaces (surface
Discussion: 1) reflection/refraction of light from surfaces (surface
Spectra vary with composition
Spectra vary with composition
Thermal infrared
Thermal infrared
Reflectance spectrum of SiO2 in the TIR
Reflectance spectrum of SiO2 in the TIR
Phase affects spectra
Phase affects spectra
Particle size affects spectra
Particle size affects spectra
Lecture 9: Spectroscopy
Lecture 9: Spectroscopy
Particle size affects spectra
Particle size affects spectra
Spectral resolution: multispectral remote sensing vs
Spectral resolution: multispectral remote sensing vs
Spatial resolution also affects spectra (by mixing)
Spatial resolution also affects spectra (by mixing)
Intimate mixing can be highly non-linear
Intimate mixing can be highly non-linear
Spectroscopy considerations - continuum vs
Spectroscopy considerations - continuum vs
Discussion: 1) reflection/refraction of light from surfaces (surface
Discussion: 1) reflection/refraction of light from surfaces (surface
Spectra of common Earth-surface materials
Spectra of common Earth-surface materials
Spectra of common Earth-surface materials
Spectra of common Earth-surface materials
Spectra of common Earth-surface materials
Spectra of common Earth-surface materials
Leaf structure and its relation to spectra
Leaf structure and its relation to spectra
Next Class: Satellites & orbits Review for Midterm
Next Class: Satellites & orbits Review for Midterm

Презентация: «Lecture 9: Spectroscopy». Автор: Alan Gillespie. Файл: «Lecture 9: Spectroscopy.ppt». Размер zip-архива: 1755 КБ.

Lecture 9: Spectroscopy

содержание презентации «Lecture 9: Spectroscopy.ppt»
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1 Lecture 9: Spectroscopy

Lecture 9: Spectroscopy

Wednesday, 2 February 2011

Reading

Ch 5.14 Ch 6.1-3 Ch 4.5

2 What was covered in the previous lecture

What was covered in the previous lecture

1) reflection/refraction of light from surfaces (surface interactions) Last Friday’s lecture: 2) volume interactions - resonance - electronic interactions - vibrational interactions Today’s lecture 3) spectroscopy - continuum vs. resonance bands - spectral “mining” - continuum analysis and 4) spectra of common Earth-surface materials

LECTURES Jan 05 1. Intro Jan 07 2. Images Jan 12 3. Photointerpretation Jan 14 4. Color theory Jan 19 5. Radiative transfer Jan 21 6. Atmospheric scattering Jan 26 7. Lambert’s Law previous Jan 28 8. Volume interactions today Feb 02 9. Spectroscopy Feb 04 10. Satellites & Review Feb 09 11. Midterm Feb 11 12. Image processing Feb 16 13. Spectral mixture analysis Feb 18 14. Classification Feb 23 15. Radar & Lidar Feb 25 16. Thermal infrared Mar 02 17. Mars spectroscopy (Matt Smith) Mar 04 18. Forest remote sensing (Van Kane) Mar 09 19. Thermal modeling (Iryna Danilina) Mar 11 20. Review Mar 16 21. Final Exam

2

3 Discussion: 1) reflection/refraction of light from surfaces (surface

Discussion: 1) reflection/refraction of light from surfaces (surface

interactions) 2) volume interactions - resonance - electronic interactions - vibrational interactions 3) spectroscopy - continuum vs. resonance bands - spectral “mining” - continuum analysis 4) spectra of common Earth-surface materials

4 Spectra vary with composition

Spectra vary with composition

Minerals

Ices

KAl(SO4)2?12H2O

CaCO3

MgCO3

Be3Al2(SiO3)6

CaSO4?2(H2O)

KFe+33(OH)6(SO4)2

5 Thermal infrared

Thermal infrared

silicates

Molecular vibration modes in silicates affect the thermal infrared

6 Reflectance spectrum of SiO2 in the TIR

Reflectance spectrum of SiO2 in the TIR

QUARTZ: SiO2

The doubled peak is due to crystallographic asymmetry (hexagonal) in quartz

The silica tetrahedron is distorted in quartz: the Si-O bond down the c-axis has a different length than it does across it

7 Phase affects spectra

Phase affects spectra

Ice – liquid transition for water

Bands don’t broaden much as ice turns to water Band centers shift subtly Amount of absorption increases with optical length z in Beer’s law (e-kz) – there are no grain interfaces in water. This is a particle size affect

Low water content

High water content

8 Particle size affects spectra

Particle size affects spectra

Fine particles – spectra dominated by surface reflection

Coarse particles – spectra dominated by absorption inside grains

High surface/volume ratio Path is shorter

Low surface/volume ratio Average optical path is long

9 Lecture 9: Spectroscopy
10 Particle size affects spectra

Particle size affects spectra

Pyroxene

H2O

XY(Si,Al)2O6

11 Spectral resolution: multispectral remote sensing vs

Spectral resolution: multispectral remote sensing vs

imaging spectroscopy

Imaging spectroscopy is more likely to resolve absorption bands

KAl(SO4)2?12H2O

12 Spatial resolution also affects spectra (by mixing)

Spatial resolution also affects spectra (by mixing)

Areal (checkerboard) mixing: additive Intimate mixing: “subtractive”

KFe+33(OH)6(SO4)2

KAl(SO4)2?12H2O

13 Intimate mixing can be highly non-linear

Intimate mixing can be highly non-linear

Adding highly absorptive charcoal greatly reduces the optical path length (“z” in Beer’s Law: e-kz) A small amount has a large effect Larger amounts have diminishing effect

14 Spectroscopy considerations - continuum vs

Spectroscopy considerations - continuum vs

resonance bands

Absorption bands are measured relative to the “continuum” – the value of the spectrum if the absorption band was not present

15 Discussion: 1) reflection/refraction of light from surfaces (surface

Discussion: 1) reflection/refraction of light from surfaces (surface

interactions) 2) volume interactions - resonance - electronic interactions - vibrational interactions 3) spectroscopy - continuum vs. resonance bands - spectral “mining” - continuum analysis 4) spectra of common Earth-surface materials

16 Spectra of common Earth-surface materials

Spectra of common Earth-surface materials

17 Spectra of common Earth-surface materials

Spectra of common Earth-surface materials

18 Spectra of common Earth-surface materials

Spectra of common Earth-surface materials

Chlorophyll absorption

19 Leaf structure and its relation to spectra

Leaf structure and its relation to spectra

Absorption band in red: chlorophyll pigment Reflective NIR: scattering in the prismatic leaf cells SWIR absorption: absorption by leaf water

20 Next Class: Satellites & orbits Review for Midterm

Next Class: Satellites & orbits Review for Midterm

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