combining hitran line-by-line, uv cross section and pnnl databases for modeling of libs and raman...
Post on 21-Dec-2015
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Combining HITRAN line-by-line, UV cross section and PNNL databases for Modeling of LIBS and
Raman LIDAR
Denis Plutov, Dennis K. Killinger
Laboratory for Laser Remote SensingDepartment of Physics
University of South FloridaTampa, FL
Outline
• Improved Hitran-PC (4.0)• Combined spectra
– HITRAN Line-by-line
– UV Cross Sections (HITRAN)
– PNNL (Pacific Northwest National Lab) IR Database
• Spectra for modeling LIBS and Raman LIDAR• Summary
New capabilities of Hitran-PC 4.0
• HITRAN 2004 database usage• Addition of aerosols (BACKSCAT 4.0 model)• Addition of HITRAN cross sections into calculations• Introduction of PNNL IR database into calculations• Ability to carry out calculations for individual isotopes• New operational features
Hitran-PC line-by-line calculation overview
Additional spectral features
Hitran-PC Interface Overview
New “Info Panel”
5 Tabs of the “Info Panel”
Calculationparameters
HITRAN line-by-line
PNNL IR HITRAN Cross Sections
Manual input spectra
Displayed spectrum: Zoom-in / Zoom-out
Magnification of a selected region – Spectra stored in RAM after the calculation
Ability to zoom out
Slant Path Layer Editor
Slant path layer list
Geometry of the slant path
Slant path calculation
Adding PNNL and UV cross sections to HITRAN line-by-line (Path 1000 m)
Combined line-by-line, PNNL IR and Cross Sectional spectra obtained with the Hitran-PC (4.0) program. (Path: 1000 m. Total pressure: 1 Atm.)Cross sections: NO2 (2.13∙10-2 ppm) , NO3 (5∙10-5) ppm, O3 (0.15 ppm).PNNL: Trimethylamine (0.5 ppm).
Trimethylamine (PNNL)
Ozone (Cross sections)
NO2 (Cross sections)
4.00 0.245
0
100
Wavelength, micrometers
Example: comparison of HITRAN line-by-line, cross sectional and PNNL spectra: SF6
HITRAN Line-by-line spectrum of SF6 (No hot bands)
HITRAN Cross sectional spectrum of SF6
PNNL IR spectrum of SF6
Path length: 1000 mTemperature: 296 KSF6, 1∙10-7 Atm partial pressure
HITRANline-by-line
PNNL IR
Crosssection
955.00925.000
100
Wavenumber, cm-1
Example: comparison of HITRAN line-by-line and PNNL spectra: CH4
HITRAN line-by-line spectrum of Methane (CH4)
PNNL IR database spectrum of Methane (CH4)
Obtained with Hitran-PC 4.0 for 296K and 1000m pathMethane (CH4), 5∙10-7 Atm partial pressure
PNNL IR
HITRAN line-by-line
2.35 2.3
4.54
0
Wavelength, micrometers
Initial Use of HITRAN / PNNL / Cross_Sections for LIBS / Raman Lidar Calculations
Combined transmission spectrum of the atmosphere in the UV-VIS region obtained with Hitran-PC 4.0
Transmission spectrum of the atmosphere generated with Hitran-PC (4.0) for a (1000 m path and a total pressure of 1 Atm.)Line-by-line (ppmv): H2O (7.75∙103), O2 (2.66∙10-2).Cross sections (ppmv): NO2 (2.13∙10-2), NO3 (5∙10-5), O3 (0.15).
Wavelength, micrometers0.245
0
100
0.8
Combining the atmospheric transmission spectrum with the LIDAR equation
Calculated Raman Lidar S/N versus rangefor Naphtalene spectrum
Pt = 25 MW (10-10 Raman efficiency), telescope area A = 0.01 m2
Summary
• Added PNNL and Cross-section to line-by-line• Initial application to LIBS and Raman LIDAR
spectral signatures• Future: LIBS and Raman LIDAR and spectral
component analysis vs. Range