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International Journal of Latest Research in Science and Technology

DOI:10.29111/ijlrst   ISRA Impact Factor:3.35,  Peer-reviewed, Open-access Journal

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NEW DESIGN AND MODELIZATION OF A CONVEX GRATING FOR AN HYPERSPECTRAL IMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBE IN THE INFRARED

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International Journal of Latest Research in Science and Technology Vol.8 Issue 6, pp 1-11,Year 2019

NEW DESIGN AND MODELIZATION OF A CONVEX GRATING FOR AN HYPERSPECTRAL IMAGER OF THE CHANDRAYAAN 2 INSTRUMENT FOR THE MOON PROBE IN THE INFRARED

Bernard Sabushimike, Georges Horugavye, Serge Habraken, Jean François Jamoye, Vincent Moreau

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Received : 08 November 2019; Accepted : 28 November 2019 ; Published : 31 December 2019

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Article No. 10979
Abstract

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.

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

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To cite this article

Bernard Sabushimike, Georges Horugavye, Serge Habraken, Jean François Jamoye, Vincent Moreau , " New Design And Modelization Of A Convex Grating For An Hyperspectral Imager Of The Chandrayaan 2 Instrument For The Moon Probe In The Infrared ", International Journal of Latest Research in Science and Technology . Vol. 8, Issue 6, pp 1-11 , 2019

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