Article (Scientific journals)
NEW DESIGN AND MODELIZATION OF A CONVEX GRATING FOR AN HYPERSPECTRAL IMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBE IN THE INFRARED
Sabushimike, Bernard; Horugavye, Georges; Habraken, Serge et al.
2019In International Journal of Latest Research in Science and Technology, 8 (6), p. 1-11
Peer reviewed
 

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Keywords :
– Offner spectrometer; grating; multi-blaze grating
Abstract :
[en] For hyperspectral imaging, diffraction gratings based spectrometers exhibit high spectral resolution and optical performance. Among those spectrometers, the Offner type (which consists of an entrance slit, two concave mirrors and convex grating) offers a lot of advantages. In this paper, we propose the design and modelization of a convex grating which covers a spectral band ranging from 0.7 μm to 5 μm with a minimum diffraction efficiency of 20% at 800 nm, 50% at 3000 nm and 25% at 5000 nm. For a so wide band, a grating with a single blaze cannot satisfy these requirements. We will therefore propose an approach of multi-blaze grating which is subdivided into different sections each with its own blaze angle. On April 30, 2016 we published a similar article in your journal and the optimization process resulted in a grating design of 9 blaze wavelengths. We have continued to work on this and currently we propose a better optimization method which allows to obtain the same results but only with 3 blaze wavelengths. Meanwhile, we perform the diffraction efficiency prediction using the scalar and rigorous theories to prove the compliance of this design with the technical specifications. The rigorous theory will also allow us to study the polarization sensitivity of this grating and the calculation of the diffraction efficiency of a grating with a profile degraded by manufacturing errors to assess the impact on the diffraction efficiency and the sensitivity to polarization.
Research center :
Space sciences, Technologies and Astrophysics Research (STAR) Institute
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Sabushimike, Bernard ;  Université de Liège - ULiège > Form. doct. sc. (sc. spatiales - paysage)
Horugavye, Georges ;  Université de Liège - ULiège > Doct. sc. (physique - Bologne)
Habraken, Serge ;  Université de Liège - ULiège > Département de physique > Optique - Hololab
Jamoye, Jean-François
Moreau, Vincent
Language :
English
Title :
NEW DESIGN AND MODELIZATION OF A CONVEX GRATING FOR AN HYPERSPECTRAL IMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBE IN THE INFRARED
Publication date :
31 December 2019
Journal title :
International Journal of Latest Research in Science and Technology
eISSN :
2278-5299
Publisher :
MNK Publication, Yamunanagar, India
Volume :
8
Issue :
6
Pages :
1-11
Peer reviewed :
Peer reviewed
Name of the research project :
Conception et Modélisation des réseaux de diffraction pour imageur Hyperspectral miniature dans le domaine du visible à l'infrarouge onde courte
Funders :
HOLOLAB
Available on ORBi :
since 06 February 2020

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