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Publication Citation: Water Vapor Continuum Absorption in the 800 cm-1 to 1250 cm-1 Spectral Region at Temperatures From 311 to 363 K

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Author(s): Yuri I. Baranov; Walter J. Lafferty; Q Ma; R H. Tipping;
Title: Water Vapor Continuum Absorption in the 800 cm-1 to 1250 cm-1 Spectral Region at Temperatures From 311 to 363 K
Published: March 11, 2008
Abstract: About 200 pure water-vapor spectra covering the region from 800 cm-1 to 3500 cm-1 were recorded with resolution of 0.1 cm-1 at temperatures 311, 318, 325, 339, 352, and 363 K using a 2 m base White cell coupled to the BOMEM DA8.002 FTIR spectrometer. The water-vapor pressure varied from 28 to 151 mbar (21 to 113 torr). Under these conditions, the continuum absorbance is quite measurable with the available path lengths up to 116 m. A program was developed for spectral processing that calculates, fits, and removes ro-vibrational structure from the spectrum. The spectra obtained were used to retrieve averaged and smoothed binary absorption coefficients over the region from 800 cm-1 to 1250 cm-1. Our continuum data extrapolated to room temperature are in reasonable agreement with the CKD continuum model. But at higher temperatures the CKD model provides very low values, which are up to 50% less than those experimentally measured.
Citation: Journal of Quantitative Spectroscopy and Radiative Transfer
Volume: 109
Issue: 12-13
Pages: pp. 2291 - 2302
Keywords: calibration;hyperspectral;medical imaging;stray light
Research Areas:
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