A dual-waveband, fiber-optic/infrared (F-O/IR) temperature measurement system was enhanced with incorporated optical chopping and applied to measure the surface temperature of a coated (aluminized) Kapton HN sample. The F-O/IR system provides a non-contact means for accurate membrane temperature measurement without distorting surface contour. An FTIR spectrometer was used to measure the absorptance and reflectance properties of the Kapton HN sample. A long-wave IR scanner was used to validate and enhance results obtained from the spectrometer and predict temperature dependence of optical properties. Data are presented that demonstrate the feasibility to apply the F-O/IR system for non-contact temperature measurement of highly reflective surfaces at low temperatures.
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.
The purpose of this research is to develop a system that can accurately quantify carbon monoxide (CO) concentrations over very small regions in the troposphere by using a gas filter correlation radiometric (GFCR) system and utilizing the Moon as the infrared source. GFCR is an established method of remotely sensing the concentrations of atmospheric gases. The measurement is made by correlating a narrow-band infrared image of the source, taken through a gas filter cell (containing a known pressure of the gas), to an image taken through an evacuated filter cell. Although the GFCR technology was originally developed for use on satellites looking down at the Earth, this study takes the measurement from the Earth looking up at the Moon. An ancillary purpose of this study is to image the surface of the Moon over a narrow wave band (approximately 2102-2183 cm-1) on a large format focal plane array, and to attempt to characterize the surface as an infrared emitter.
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