Band Model Calculations of Atmospheric Transmittance for Hot Gas Line Emission Sources
Abstract
A band model formulation designed for computing the effective transmittance of the atmosphere to hot H2O/CO2 plume emission sources has been presented and discussed in detail. The effects of line correlation between the plume emission spectrum and the atmospheric H2O/CO2 absorption spectrum are accounted for by treating the entire optical path extending from the sensor position through the intervening atmosphere and including the hot emission source as a single radiating/absorbing entity. The high degree of inhomogeneity and nonisothermality of such an optical path are accounted for by either the Curtis-Godson or Lindquist-Simmons approximation. Calculations within this formulation and appropriate to the viewing geometries of satellite surveillance systems and aircraft-to-aircraft field measurements programs have been performed. For selected wide spectral bandpass regions, the effect of line correlation is shown to result in discrepancies of as much as a factor of 3 between currently calculated and correctly calculated average transmittance values.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 31, 1974
- Accession Number
- ADA005632
Entities
People
- Stephen J. Young
Organizations
- The Aerospace Corporation