Making compact and innovative dual-band thermal imagers using hybrid optical elements

[en] Infrared (IR) remote sensing o ers a huge range of applications, mostly addressing make-or-break issues of our century (crops water content monitoring, forest res and volcanic eruption detection and imaging, etc.). These applications fall under di erent spectral bands, known as mid and long-wave infrared, which are very hard to combine in a single compact instrument. In this article we propose to explore the infrared (IR) behaviour of a dual-band di ractive component: the multilayer di ractive optical element (MLDOE). We use and discuss the thin element approximation as a valid phase model. Using Fourier optics, we are able to simulate the resulting image of the MLDOE. Thereby, ray-tracing software are not accurate to model a complex di ractive component. The Strehl ratio is used to determine the focalization e ciency for the working order, which is above 95% in the mid and long-wave infrared bands. This result, along with the very low energy content of the other orders, proves the strong imaging potential of MLDOEs for dual-band applications. It is also demonstrated that the MLDOE has the same chromatic behaviour as standard DOEs, making it a very useful component for infrared achromatization.

Disciplines :

Physics

Author, co-author :

Laborde, Victor ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)

Loicq, Jerôme ; Université de Liège - ULiège > CSL (Centre Spatial de Liège)

Habraken, Serge ; Université de Liège - ULiège > Département de physique > Optique - Hololab

Kerschen, Gaëtan ; Université de Liège - ULiège > Département d'aérospatiale et mécanique > Laboratoire de structures et systèmes spatiaux

Language :

English

Title :

Making compact and innovative dual-band thermal imagers using hybrid optical elements

Publication date :

01 April 2021

Event name :

International Conference on Space Optics — ICSO 2021

Event organizer :

CNES

Event place :

Online, France

Event date :

30-03-2021 to 2-04-2021

Audience :

International

Main work title :

Making compact and innovative dualband thermal imagers using hybrid optical elements

Publisher :

SPIE

Edition :

revised

Collection name :

Vol. 11852 118522E-14

Additional URL :

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/11852/2599377/Making-compact-and-innovative-dual-band-thermal-imagers-using-hybrid/10.1117/12.2599377.full?SSO=1&tab=ArticleLink

Available on ORBi :

since 12 April 2021

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