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Proceedings Paper

Effects of stray light in FTIR instruments on open-path measurements
Author(s): George M. Russwurm; Jeffrey W. Childers; Edgar L. Thompson Jr.
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Paper Abstract

The single-beam spectra recorded with two commercially available monostatic FT-IR open-path monitors exhibited nonzero signal intensities in the wave number regions where water vapor and CO2 totally absorb. Each instrument yielded a measureable spectral response with the transmitting/receiving telescope blocked. This response is attributed to stray light within the FT-IR system. In some cases the stray light contributed up to 17% of the total return intensity measured along a 414-m path length. Although the baseline region of the single-beam spectra can be corrected for stray light, its effect on the spectral absorbance is not uniform over the range of absorbance values recorded in long-path measruements. Thus, the concentration of species measured along the path cannot be easily corrected, which has a deleterious effect on the accuracy of the spectral data.

Paper Details

Date Published: 31 May 1995
PDF: 8 pages
Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); doi: 10.1117/12.210807
Show Author Affiliations
George M. Russwurm, ManTech Environmental Technology, Inc. (United States)
Jeffrey W. Childers, ManTech Environmental Technology, Inc. (United States)
Edgar L. Thompson Jr., ManTech Environmental Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 2365:
Optical Sensing for Environmental and Process Monitoring
Orman A. Simpson, Editor(s)

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