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Proceedings Paper

Development and testing of gas filters used in correlation radiometry for carbon monoxide measurement
Author(s): Danielle Rockwood; Jared T Fravel
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Paper Abstract

The design and manufacture of gas filters is critical in Gas Filter Correlation Radiometry (GFCR). Gas cells are either evacuated or back-filled with carbon monoxide (CO) and serve as high-resolution optical filters. The filters must be able to maintain a sustained vacuum for several days and feature optics transmissive in the infrared (IR). GFCR is applied to measure concentrations of carbon monoxide in the troposphere using the moon as a radiance source. The filters are an important component in this experimental effort. The design and manufacturing process associated with the filters is presented and test results described. In order to test the gas filters for functionality, two processes are employed. The first is a simple pressure versus time experiment that shows how well the cells operate under vacuum pressure. The second utilizes a Fourier Infrared Spectrometer that shows the absorption spectra within the gas filter. The latter analysis reveals whether outside air leaks into the gas filter. Initial testing shows that the latest generation of the filters is effective in maintaining vacuum pressures.

Paper Details

Date Published: 15 March 2002
PDF: 8 pages
Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); doi: 10.1117/12.459621
Show Author Affiliations
Danielle Rockwood, James Madison Univ. (United States)
Jared T Fravel, James Madison Univ. (United States)

Published in SPIE Proceedings Vol. 4710:
Thermosense XXIV
Xavier P. Maldague; Andres E. Rozlosnik, Editor(s)

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