Computerized Method for the Generation of Molecular Transmittance Functions in the Infrared Region.
Abstract
A study is made of two basically distinct methods normally used in the development of band models for the calculation of gaseous molecular transmittance in the infrared region. The first method consists of the determination of the 'empirical' transmittance function and the associated absorber and spectral parameters from measured or calculated transmittance spectra. The second method consists of the determination of the absorber and spectral parameters with an assumed 'analytical' transmittance function, using the same type of data. Computerized numerical techniques are presented in connection with the first method and a generalized transmittance function is adopted for the second method. Although the methodology is generally applicable to other gaseous species, it is specifically discussed in connection with the trace gases SO2, NO, NO2, and NH3. As a secondary effort a structural breakdown of the Lowtran code is presented for the purpose of incorporating the band models for the trace gases.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1979
- Accession Number
- ADA081789
Entities
People
- Joseph H. Pierluissi
- Ken Tomiyama
Organizations
- University of Texas at El Paso