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Proceedings Paper

Comparative analysis of alternative spectral bands of CO2 and O2 for the sensing of CO2 mixing ratios
Author(s): Denis Pliutau; Narasimha S. Prasad
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Paper Abstract

We performed comparative studies to establish favorable spectral regions and measurement wavelength combinations in alternative bands of CO2 and O2, for the sensing of CO2 mixing ratios (XCO2) in missions such as ASCENDS. The analysis employed several simulation approaches including separate layers calculations based on pre-analyzed atmospheric data from the modern-era retrospective analysis for research and applications (MERRA), and the line-by-line radiative transfer model (LBLRTM) to obtain achievable accuracy estimates as a function of altitude and for the total path over an annual span of variations in atmospheric parameters. Separate layer error estimates also allowed investigation of the uncertainties in the weighting functions at varying altitudes and atmospheric conditions. The parameters influencing the measurement accuracy were analyzed independently and included temperature sensitivity, water vapor interferences, selection of favorable weighting functions, excitations wavelength stabilities and other factors. The results were used to identify favorable spectral regions and combinations of on / off line wavelengths leading to reductions in interferences and the improved total accuracy.

Paper Details

Date Published: 31 May 2013
PDF: 9 pages
Proc. SPIE 8718, Advanced Environmental, Chemical, and Biological Sensing Technologies X, 87180L (31 May 2013); doi: 10.1117/12.2016337
Show Author Affiliations
Denis Pliutau, NASA Langley Research Ctr. (United States)
Narasimha S. Prasad, NASA Langley Research Ctr. (United States)

Published in SPIE Proceedings Vol. 8718:
Advanced Environmental, Chemical, and Biological Sensing Technologies X
Tuan Vo-Dinh; Robert A. Lieberman; Günter G. Gauglitz, Editor(s)

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