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Proceedings Paper

Open-path atmospheric monitoring with a low-resolution FTIR spectrometer
Author(s): Peter R. Griffiths; Robert L. Richardson; Deru Qin; Changjiang Zhu
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Paper Abstract

The advantages of measuring open-path Fourier transform infrared (OP/FT-IR) spectra at low resolution are discussed both from a theoretical and experimental viewpoint. In general, the optimum combination of selectivity and sensitivity is found when the resolution is approximately equal to the average full-width at half height (FWHH) of the analytical bands. The FWHH of many bands in the vapor-phase spectra of molecules of medium size, such as chlorinated organic solvents, is approximately 20 cmMIN1, so that a resolution of 16 cmMIN1 is often found to yield the most accurate analytical results. The low baseline noise level found when spectra are measured at low resolution can allow room temperature deuterated triglycine sulfate pyroelectric bolometers to be used instead of liquid nitrogen cooled mercury cadmium telluride photodetectors for OP/FT-IR measurements.

Paper Details

Date Published: 31 May 1995
PDF: 11 pages
Proc. SPIE 2365, Optical Sensing for Environmental and Process Monitoring, (31 May 1995); doi: 10.1117/12.210802
Show Author Affiliations
Peter R. Griffiths, Univ. of Idaho (United States)
Robert L. Richardson, Univ. of Idaho (United States)
Deru Qin, Univ. of Idaho (United States)
Changjiang Zhu, Univ. of Idaho (United States)

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

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