$Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index$
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Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index

We propose a novel type of spectral diffractive lenses that operate in the ±1-st diffraction orders. Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and –1-st diffraction orders. The spectral lenses are convenient to use for obtaining remotely sensed vegetatio...

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Autores principales:	Veronika Blank, Roman Skidanov, Leonid Doskolovich, Nikolay Kazanskiy
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	diffractive lenses spectral lenses vegetation indices hyperspectrometer Chemical technology TP1-1185
Acceso en línea:	https://doaj.org/article/008240e11448499597f4be2564a1ecb3
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spelling	oai:doaj.org-article:008240e11448499597f4be2564a1ecb32021-11-25T18:58:32ZSpectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index10.3390/s212276941424-8220https://doaj.org/article/008240e11448499597f4be2564a1ecb32021-11-01T00:00:00Zhttps://www.mdpi.com/1424-8220/21/22/7694https://doaj.org/toc/1424-8220We propose a novel type of spectral diffractive lenses that operate in the ±1-st diffraction orders. Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and –1-st diffraction orders. The spectral lenses are convenient to use for obtaining remotely sensed vegetation index images instead of full-fledged hyperspectral images. We discuss the design and fabrication of spectral diffractive lenses for measuring vegetation indices, which include a Modified Red Edge Simple Ratio Index and a Water Band Index. We report synthesizing diffractive lenses with a microrelief thickness of 4 µm using the direct laser writing in a photoresist. The use of the fabricated spectral lenses in a prototype scheme of an imaging sensor for index measurements is discussed. Distributions of the aforesaid spectral indices are obtained by the linear scanning of vegetation specimens. Using a linear scanning of vegetation samples, distributions of the above-said water band index were experimentally measured.Veronika BlankRoman SkidanovLeonid DoskolovichNikolay KazanskiyMDPI AGarticlediffractive lensesspectral lensesvegetation indiceshyperspectrometerChemical technologyTP1-1185ENSensors, Vol 21, Iss 7694, p 7694 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	diffractive lenses spectral lenses vegetation indices hyperspectrometer Chemical technology TP1-1185
spellingShingle	diffractive lenses spectral lenses vegetation indices hyperspectrometer Chemical technology TP1-1185 Veronika Blank Roman Skidanov Leonid Doskolovich Nikolay Kazanskiy Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
description	We propose a novel type of spectral diffractive lenses that operate in the ±1-st diffraction orders. Such spectral lenses generate a sharp image of the wavelengths of interest in the +1-st and –1-st diffraction orders. The spectral lenses are convenient to use for obtaining remotely sensed vegetation index images instead of full-fledged hyperspectral images. We discuss the design and fabrication of spectral diffractive lenses for measuring vegetation indices, which include a Modified Red Edge Simple Ratio Index and a Water Band Index. We report synthesizing diffractive lenses with a microrelief thickness of 4 µm using the direct laser writing in a photoresist. The use of the fabricated spectral lenses in a prototype scheme of an imaging sensor for index measurements is discussed. Distributions of the aforesaid spectral indices are obtained by the linear scanning of vegetation specimens. Using a linear scanning of vegetation samples, distributions of the above-said water band index were experimentally measured.
format	article
author	Veronika Blank Roman Skidanov Leonid Doskolovich Nikolay Kazanskiy
author_facet	Veronika Blank Roman Skidanov Leonid Doskolovich Nikolay Kazanskiy
author_sort	Veronika Blank
title	Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
title_short	Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
title_full	Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
title_fullStr	Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
title_full_unstemmed	Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index
title_sort	spectral diffractive lenses for measuring a modified red edge simple ratio index and a water band index
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/008240e11448499597f4be2564a1ecb3
work_keys_str_mv	AT veronikablank spectraldiffractivelensesformeasuringamodifiedrededgesimpleratioindexandawaterbandindex AT romanskidanov spectraldiffractivelensesformeasuringamodifiedrededgesimpleratioindexandawaterbandindex AT leoniddoskolovich spectraldiffractivelensesformeasuringamodifiedrededgesimpleratioindexandawaterbandindex AT nikolaykazanskiy spectraldiffractivelensesformeasuringamodifiedrededgesimpleratioindexandawaterbandindex
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Spectral Diffractive Lenses for Measuring a Modified Red Edge Simple Ratio Index and a Water Band Index

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