Accession Number : ADA085436


Title :   Computerized Method for the Generation of Molecular Transmittance Functions in the Infrared.


Descriptive Note : Final rept.,


Corporate Author : TEXAS UNIV AT EL PASO DEPT OF ELECTRICAL ENGINEERING


Personal Author(s) : Pierluissi,Joseph H ; Tomiyama,Ken


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a085436.pdf


Report Date : Apr 1980


Pagination or Media Count : 195


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.


Descriptors :   *MOLECULAR SPECTROSCOPY , *TRANSMITTANCE , *INFRARED SPECTRA , NUMERICAL ANALYSIS , AMMONIA , RADIATION ABSORPTION , COMPUTER APPLICATIONS , FLOW CHARTING , NITROGEN OXIDES , SUBROUTINES , MACHINE CODING , BAND SPECTRA , ABSORPTION COEFFICIENTS , SULFUR OXIDES , TRACE GASES


Subject Categories : Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE