Development and testing of gas filters used in correlation radiometry for carbon monoxide measurement

Danielle Rockwood; Jared T Fravel

doi:10.1117/12.459621

15 March 2002 Development and testing of gas filters used in correlation radiometry for carbon monoxide measurement

Danielle Rockwood, Jared T Fravel

Proceedings Volume 4710, Thermosense XXIV; (2002) https://doi.org/10.1117/12.459621
Event: AeroSense 2002, 2002, Orlando, FL, United States

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.

Citation Download Citation

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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KEYWORDS

Optical filters

Carbon monoxide

Image filtering

Infrared radiation

Infrared imaging

Spectroscopy

Design for manufacturability

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