EMIT uses an advanced imaging spectrometer instrument that measures a spectrum for every point in the image. Sunlight reflected from minerals on the Earth’s surface is imaged by a telescope and spectrometer system onto a detector area array that is sensitive from the visible to short wavelength infrared portion of the electromagnetic spectrum. The EMIT dust source minerals have distinct spectral signatures in this wavelength range. Each column of the detector array records the spectrum for a sample of 1240 cross-track EMIT instrument swath. The along-track dimension of the image is built up with the forward motion of the ISS. The imaging spectrometer measured image cubes are calibrated to spectral radiance, then atmospherically corrected and analyzed to determine the mineral composition that is required to achieve the EMIT science objectives.
The Compact Wide-swath Imaging Spectrometer (CWIS) is prototype for the EMIT imaging spectrometer. CWIS demonstrated a full spectral range Dyson design imaging spectrometer operation from the visible to the short wavelength infrared portion of the spectrum.
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