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15 March 2002 Development and testing of gas filters used in correlation radiometry for carbon monoxide measurement
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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.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Danielle Rockwood and Jared T Fravel "Development and testing of gas filters used in correlation radiometry for carbon monoxide measurement", Proc. SPIE 4710, Thermosense XXIV, (15 March 2002); https://doi.org/10.1117/12.459621
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