A Model for the Spectral Emissivity of Carbon Dioxide in the 4.3-Micron Band
Abstract
This report describes in somewhat tutorial detail a method for computing the spectral emissivity of hot carbon dioxide in the 4.3-micron band. This band is taken to cover the spectral region 2050 to 2400/cm (4.17 to 4.88 microns). Data are presented for the temperature range 300 to 2100K. Spectroscopic band parameters have largely been taken from available literature data. The average values for the integrated intensity of a rotational line (S) and the distance between the spectral lines (d) are tabulated in the standard form S/d and S 1/2 d. Values are listed every 5/cm in increments of 300K. Emissivities are calculated by the statistical model. A curve of growth function suggested by Malkmus and adopted by Ben-Aryeh is used for the relationship between absorption and reduced path lengths. The results of this model agree most favorably with reliable experimental measurements. The discussion includes homogeneous as well as inhomogeneous gases. The homogeneous case is presented in its entirety in that the emissivity model, the molecular band parameters, and the digital computer program are presented. Illustrative examples are given for both the homogeneous and inhomogeneous formulations.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 07, 1969
- Accession Number
- AD0853537
Entities
People
- H. T. Jackson Jr.
Organizations
- United States Army Aviation and Missile Command