NDLI: Hyperspectral infrared imaging of flames using a spectrally scanning fabry-perot filter

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Hyperspectral infrared imaging of flames using a spectrally scanning fabry-perot filter

Content Provider	NASA Technical Reports Server (NTRS)
Author	Marinelli, W. J. Lawrence, W. G. Allen, M. G. Rawlins, W. T.
Copyright Year	2001
Description	The temperatures and compositions of gases in and around flames can be diagnosed using infrared emission spectroscopy to observe molecular band shapes and intensities. We have combined this approach with a low-order scanning Fabry-Perot filter and an infrared camera to obtain spectrally scanned infrared emission images of a laboratory flame and exhaust plume from 3.7 to 5.0 micrometers, at a spectral resolution of 0.043 micrometers, and a spatial resolution of 1 mm. The scanning filter or AIRIS (Adaptive Infrared Imaging Spectroradiometer) is a Fabry-Perot etalon operating in low order (mirror spacing = wavelength) such that the central spot, containing a monochromatic image of the scene, is viewed by the detector array. The detection system is a 128 x 128 liquid-nitrogen-cooled InSb focal plane array. The field of view is controlled by a 50 mm focal length multielement lens and an V4.8 aperture, resulting in an image 6.4 x 6.4 cm in extent at the flame and a depth of field of approximately 4 cm. Hyperspectral images above a laboratory CH4/air flame show primarily the strong emission from CO2 at 4.3 micrometers, and weaker emissions from CO and H2O. We discuss techniques to analyze the spectra, and plans to use this instrument in microgravity flame spread experiments.
File Size	769912
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20020025450
Archival Resource Key	ark:/13960/t3227vk7x
Language	English
Publisher Date	2001-01-01
Access Restriction	Open
Subject Keyword	Inorganic, Organic And Physical Chemistry Temperature Measurement Spectroradiometers Infrared Spectroscopy Flames Etalons Flame Spectroscopy Infrared Imagery Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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