Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2019, Vol. 16, No. 2, pp. 143-149
Comparison of aircraft imaging spectrometers with different types of polychromators
O.V. Grigorieva
1 , V.N. Gruzdev
2 , A.Yu. Kouznetsov
3 , l.I. Chapursky
1 , B.V. Shilin
2 1 A.F. Mozhaisky Military Space Academy, Saint Petersburg, Russia
2 Scientific-Research Centre for Ecological Safety RAS, Saint Petersburg, Russia
3 Saint Petersburg National Research University of Information Technologies, Mechanics and Optics, Saint Petersburg, Russia
Accepted: 10.01.2019
DOI: 10.21046/2070-7401-2019-16-2-143-149
Most of the visible-near infrared spectrometers developed in the Russian Federation are constructed with a polychromator based on the prism. This type gives an alternating spectral resolution from 1.5 nm in the violet to 10 nm in the near-IR range. Another type of imaging spectrometers uses polychromators with a diffraction grating which provide a constant spectral resolution. The red-close IR region of the spectrum of 600–1000 nm is the most important for the diagnosis and differentiation of vegetation by the position and steepness of the “red edge” near 700 nm and the height of the “IR plateau” 700–900 nm. Most of the visible-near infrared spectrometers developed in the Russian Federation are constructed with a polychromator based on the prism. This type gives an alternating spectral resolution from 1.5 nm in the violet to 10 nm in the near-IR range. Another type of imaging spectrometers uses polychromators with a diffraction grating which provide a constant spectral resolution. The red-close IR region of the spectrum of 600–1000 nm is the most important for the diagnosis and differentiation of vegetation by the position and steepness of the “red edge” near 700 nm and the height of the “IR plateau” 700–900 nm. This is confirmed by an experimental comparison in flight studies by aircraft An-30. Both devices of imaging spectrometers ― “Fregat” (with a diffraction grating) and “Lepton” (with a prism) were installed on board simultaneously.
Keywords: video spectrometer, polychromator, reflection spectra
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