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Proceedings Paper

A portable vapor cell for passive FT-IR spectrometer evaluation
Author(s): Roger J. Combs; Alan S. Cummings; Mark J. Thomas; Robert T. Kroutil
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Paper Abstract

Gravimetrically prepared aqueous binary solutions permit the generation of target vapors of methanol and ammonia in a portable vapor cell. A passive Fourier transform infrared (FT-IR) spectrometer monitors a short pathlength optical cell using a calibrated extended-blackbody background source. The temperature of the blackbody ranges from 5°C to 50°C in five degree increments. This temperature range simulates the radiance levels most often encountered for ambient temperature backgrounds in open-air field measurements. The solute liquid mole fractions determine the resultant vapor concentrations. The water component attenuates the target vapor concentration from that of the pure solute component depending on the solute liquid mole fraction. This study demonstrates the utility of a portable vapor cell using a series of binary aqueous solutions per target compound over the Beer’s Law range of infrared absorbances. These Beer’s Law infrared absorbances and blackbody radiance levels are within the linearity range of the passive FT-IR spectrometer and are representative of open-air field conditions.

Paper Details

Date Published: 1 June 2005
PDF: 18 pages
Proc. SPIE 5806, Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XI, (1 June 2005); doi: 10.1117/12.605272
Show Author Affiliations
Roger J. Combs, Research & Technology Consultants (United States)
Alan S. Cummings, Tetra Tech EM, Inc. (United States)
Mark J. Thomas, U.S. Environmental Protection Agency Region VII (United States)
Robert T. Kroutil, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 5806:
Algorithms and Technologies for Multispectral, Hyperspectral, and Ultraspectral Imagery XI
Sylvia S. Shen; Paul E. Lewis, Editor(s)

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