Share Email Print
cover

Proceedings Paper

Nonlinear FTIR open-path data reduction algorithm
Author(s): William Phillips; Danny Brown; George M. Russwurm; Jeffrey W. Childers; Edgar L. Thompson; Lori Tussey
Format Member Price Non-Member Price
PDF $14.40 $18.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

A nonlinear spectral curve fitting computer algorithm for the reduction of Fourier transform spectrometer data is being developed at the Air Force's Arnold Engineering Development Center. The algorithm is an adaptation of an existing algorithm utilized for plume signature data and optical gas diagnostics data reduction. The nonlinear algorithm is not constrained by the linear absorbance assumptions required for classical least squares (CLS). Therefore, the nonlinear algorithm allows for the determination of gas concentrations from high absorption level spectra as well as determination of other nonlinear parameters such as spectra shift and spectral resolution. In addition, the currently implemented algorithm has the ability to simultaneously determine the background spectra or I degrees. These capabilities could make the nonlinear algorithm a welcome addition as a quality assurance and data reduction tool. Open path Fourier transform IR spectra from various sources have been analyzed utilizing this algorithm in an attempt to determine its capabilities and limitations. As various data sets are analyzed the algorithm is further refined to make its application easier and faster. A brief description of the algorithm and the results of a comparative study between the nonlinear algorithm and CLS is presented.

Paper Details

Date Published: 22 May 1997
PDF: 11 pages
Proc. SPIE 3106, Spectroscopic Atmospheric Monitoring Techniques, (22 May 1997); doi: 10.1117/12.274723
Show Author Affiliations
William Phillips, Sverdrup Technology, Inc. (United States)
Danny Brown, Sverdrup Technology, Inc. (United States)
George M. Russwurm, ManTech Environmental Technology, Inc. (United States)
Jeffrey W. Childers, ManTech Environmental Technology, Inc. (United States)
Edgar L. Thompson, ManTech Environmental Technology, Inc. (United States)
Lori Tussey, Environmental Protection Agency (United States)


Published in SPIE Proceedings Vol. 3106:
Spectroscopic Atmospheric Monitoring Techniques
Klaus Schaefer, Editor(s)

© SPIE. Terms of Use
Back to Top