Effect of interferogram smearing on atmospheric limb sounding by Fourier transform spectroscopy

Journal Article · Thu Apr 15 00:00:00 EST 1982 · Appl. Opt.; (United States)

DOI:https://doi.org/10.1364/AO.21.001356· OSTI ID:5250081

Park, J H

A method is presented for analyzing an absorption spectrum obtained from the interferogram measured by an interferometer operated in the solar occultation mode. In this mode the complete interferogram is smeared with various components of individual interferograms generated by rays passing through different tangent altitudes. It is shown that the effective tangent altitude of the spectrum is the altitude at which the center fringe of the interferogram is recorded and that the other components of the interferogram only define the instrument line shape. The interferogram smearing effectively creates strong sidelobes on absorption lines so that a strong apodization on the interferogram is recommended for the solar occultation experiment. These concepts applied to retrieve pressure and temperature simultaneously from stratospheric absorption spectra in the CO/sub 2/ 4.3-..mu..m band obtained by a balloon-borne interferometer in 1976 over Palestine, Tex. Included in the analysis of the CO/sub 2/ 4.3-..mu..m band are the continuum absorptions by the pressure-induced N/sub 2/ fundamental band and by far wings of the CO/sub 2/ v/sub 3/ band. The CO/sub 2/ absorption line is corrected by a sub-Lorentzian function. Excellent agreement is found between the observed and simulated spectra.

• Research Organization: NASA Langley Research Center, Hampton, Virginia 23665
• OSTI ID: 5250081
• Journal Information: Appl. Opt.; (United States), Vol. 21:8
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
CARBON DIOXIDE
ABSORPTION SPECTRA
ELECTRONIC STRUCTURE
INFRARED SPECTRA
INTERFEROMETRY
STRATOSPHERE
PRESSURE MEASUREMENT
TEMPERATURE MEASUREMENT
FOURIER TRANSFORMATION
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
EARTH ATMOSPHERE
INTEGRAL TRANSFORMATIONS
OXIDES
OXYGEN COMPOUNDS
SPECTRA
TRANSFORMATIONS
500200* - Environment
Atmospheric- Chemicals Monitoring & Transport- (-1989)