A Computational Method for Spectral Molecular Absorption Using an Improved Voigt Algorithm.

Abstract

Discussion of the fundamental elements and theory related to atmospheric transmittance is presented. A line-by-line transmission computer program is developed that utilizes the combined Doppler-Lorentz (Voigt) line broadening function. In addition a rapid algorithm to evaluate the Voigt function with a maximum relative error of about one part in 10,000 is described and a software package that processes the absorption line parameters necessary to calculate transmittance is given. The results of transmittance calculations for seven channels in the fifteen micrometer band, corresponding to the seven High Resolution Infrared Radiation Sounder (HIRS) channels, are furnished and the procedure to compute a band averaged transmission discussed. It is concluded that the Voigt algorithm developed here is an excellent computational procedure and the resulting transmittance program correctly calculates atmospheric transmission. (Author)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1977
Accession Number
ADA052685

Entities

People

  • Peter Clark Van Derwood

Organizations

  • University of Texas at El Paso

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Absorption Coefficients
  • Algorithms
  • Atmospheric Temperature
  • Carbon Monoxide
  • Coefficients
  • Computational Science
  • Computer Programs
  • Computers
  • Dielectric Gases
  • Differential Equations
  • Electromagnetic Spectra
  • Equations
  • Measurement
  • Scattering
  • Spectra
  • Spectral Lines
  • Spectroscopy

Fields of Study

  • Physics

Readers

  • Spectroscopy.