1985 model 172p v speeds
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In the discussion below, we use spectral imaging to refer simply to any measurement attempting to obtain an I ( x, y, λ ) datacube of a scene, in which the spectral dimension is sampled by more than three elements. Some authors make a distinction between systems with few versus many spectral bands (spectral imaging versus imaging spectrometry), or with contiguous versus spaced spectral bands (hyperspectral versus multispectral imaging). One often finds spectral imaging, imaging spectrometry (or imaging spectroscopy), hyperspectral imaging, and multispectral imaging used almost interchangeably. The field of spectral imaging is plagued with inconsistent use of terminology, beginning with the field’s name itself. The variety of instruments available can be a source of confusion, so we use our direct experience with a number of these technologies to provide comparisons among them, listing some of their advantages and disadvantages. After providing background and definitions of terms, we present a historical survey of the field and summarize each individual measurement technique. In the discussion below, we provide what we believe is the first overview of snapshot spectral imaging implementations. Snapshot spectral imagers, on the other hand, use optical designs that differ greatly from these standard forms in order to provide a boost in light collection capacity by up to three orders of magnitude. Modified forms of the classic Czerny-Turner, Offner, and Michelson spectrometer layouts remain standard.
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But the underlying optical technology has not really changed. Over the following 30 years, better optical designs, improved electronics, and advanced manufacturing have all contributed to improving performance by over an order of magnitude since that time. The use of imaging spectrometers was rare before the arrival of 2-D CCD arrays in the 1980s, but steadily grew as detector technology advanced. The portions of the datacube collected during a single detector integration period for (a) scanning and (b) snapshot devices. 5.2 Using Snapshot Instruments in Scanning Applications.4.13 Multispectral Sagnac Interferometer (MSI, 2010).4.12 Snapshot Hyperspectral Imaging Fourier Transform Spectrometer (SHIFT, 2010).4.11 Image Mapping Spectrometry (IMS, 2009).4.10 Coded Aperture Snapshot Spectral Imager (CASSI, 2007).4.9 Image-Replicating Imaging Spectrometer (IRIS, 2003).4.8 Spectrally Resolving Detector Arrays (SRDA, 2001).4.6 Multiaperture Filtered Camera (MAFC, 1994).4.5 Computed Tomography Imaging Spectrometry (CTIS, 1991).4.4 Multispectral Beamsplitting (MSBS, 1978).
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4.1 Integral Field Spectrometry with Faceted Mirrors (IFS-M, 1938).4 Snapshot Spectral Imaging Technologies.3.6 Coded Aperture Line-Imaging Spectrometer.3.5 Computed Tomography Hyperspectral Imaging Spectrometer.3.4 Imaging Fourier Transform Spectrometer.3 Scanning Imaging Spectrometer Architectures.