MODERN METHODS AND SYSTEMS FOR FORMING HYPERSPECTRAL IMAGES
P. E. Kotlyar, O. I. Potaturkin
Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
Keywords: light filter, Fabry-Perot interferometer, liquid crystal filter, acousto-optic filter, Mach-Zehnder interferometer
Abstract
Methods and systems for generating hyperspectral data based on spectral scanning and without image scanning are considered. This is due to the transition in many practical problems from aerospace to “ground-based” hyperspectral imaging methods. Options for implementing spectrum separation devices, a key element of modern viewing hyperspectrometers, are presented. The main parameters and technical characteristics of absorption, interference, and liquid crystal filters are presented, and their fundamental capabilities are shown. The cross section of the filtered light beam and its angular aperture in such devices can be very large, which makes them suitable for studying objects of weak radiation. Tunable filters without mechanical movements of structural elements based on high-speed acousto-optical devices and planar Mach-Zehnder interferometers with electrostatic control are considered. Currently, their maximum spectral resolution is less than 1 nm for the visible and near-infrared ranges.
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