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International Journal of Latest Research in Science and Technology

DOI:10.29111/ijlrst   ISRA Impact Factor:3.35

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DESIGN AND MODELIZATION OF ACONVEX GRATING FOR AN HYPERSPECTRALIMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBEIN THEINFRARED

Research Paper Open Access

International Journal of Latest Research in Science and Technology Vol.5 Issue 2, pp 69-74,Year 2016

DESIGN AND MODELIZATION OF ACONVEX GRATING FOR AN HYPERSPECTRALIMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBEIN THEINFRARED

Bernard Sabushimike, Georges Horugavye, Pierre Piron, Jean Fran?ois Jamoye, Vincent Moreau,Serge Habraken

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Received : 20 April 2016; Accepted : 25 April 2016 ; Published : 30 April 2016

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Abstract

For hyper spectral 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 convexgrating) offersa lot of advantages. In this paper, we propose the design and modelization of aconvexgrating which coversa spectral band ranging from0.7μmto 5 μm with a minimum diffraction efficiency of 20% at 800nm, 50% at 3000nmand25%at5000nm.Fora so wideband, agrating with a single blaze cannot satisfy these requirements. We will the reforepropose an approach of multi-blaze grating which is subdivided into differentsectionseach with its ownblaze angle. 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.

Key Words   
Offner spectrometer, grating, blazing, multi-blaze grating

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References
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To cite this article

Bernard Sabushimike, Georges Horugavye, Pierre Piron, Jean Fran?ois Jamoye, Vincent Moreau,Serge Habraken , " Design And Modelization Of Aconvex Grating For An Hyperspectralimager Of The Chandrayaan 2 Instrument For The Moon Probein Theinfrared ", International Journal of Latest Research in Science and Technology . Vol. 5, Issue 2, pp 69-74 , 2016

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