Physics
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2365..339r&link_type=abstract
Proc. SPIE Vol. 2365, p. 339-346, Optical Sensing for Environmental and Process Monitoring, Orman A. Simpson; Ed.
Physics
Scientific paper
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.
Childers Jeffrey W.
Russwurm George M.
Thompson Edgar L.
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