Technique For Achieving High Throughput With A Pushbroom Imaging Spectrometer
Fourier transform spectrometry; Hyperspectral imager; Imaging spectrometry
Static Fourier transform spectrometers have the ability to combine the principle advantages of the two traditional techniques used for imaging spectrometry: The throughput advantage offered by Fourier transform spectrometers, and the advantage of no moving parts offered by dispersive spectrometers. The imaging versions of these spectrometers obtain both spectral information, and spatial information in one dimension, in a single exposure. The second spatial dimension may be obtained by sweeping a narrow field mask across the object while acquiring successive exposures. When employed as a pushbroom sensor from an aircraft or spacecraft, no moving parts are required, since the platform itself provides this motion. But the use of this narrow field mask to obtain the second spatial dimension prevents the throughput advantage from being realized. We present a technique that allows the use of a field stop that is wide in the along-track direction, while preserving the spatial resolution, and thus enables such an instrument to actually exploit the throughput advantage when used as a pushbroom sensor. The basis of this advance is a deconvolution technique we have developed to recover the spatial resolution in data acquired with a field stop that is wide in the along-track direction. The effectiveness is demonstrated by application of this deconvolution technique to simulated data.
Proceedings of SPIE - The International Society for Optical Engineering
Number of Pages
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Sellar, R. Glenn; Katsevich, Alexander I.; and Kirkland, Laurel E., "Technique For Achieving High Throughput With A Pushbroom Imaging Spectrometer" (2002). Scopus Export 2000s. 2935.