Combining HITRAN line-by-line, UV cross section and PNNL databases for Modeling of LIBS and Raman...

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