C’est ce que propose une équipe de recherche de Finlande. Dans un article publié dans le SPIE.digitalLibrary, ces chercheurs proposent de transformer un smartphone en imageur hyperspectral à l’aide d’un interféromètre de Fabry-Perot. (https://fr.wikipedia.org/wiki/Interf%C3%A9rom%C3%A8tre_de_Fabry-Perot). La technologie employée semble limiter la gamme spectrale qu’il est possible de mesurer, ce qui limite aussi l’intérêt du prototype proposé. Toutefois, cet essai mérite d’être mentionné et ouvre peut-être la voie vers de nouvelles applications des smartphones dans le domaine de la mesure optique.
Le résumé de l’article :
This paper demonstrates a mobile phone- compatible hyperspectral imager based on a tunable MEMS Fabry-Perot interferometer. The realized iPhone 5s hyperspectral imager (HSI) demonstrator utilizes MEMS FPI tunable filter for visible-range, which consist of atomic layer deposited (ALD) Al₂O₃/TiO₂-thin film Bragg reflectors. Characterization results for the mobile phone hyperspectral imager utilizing MEMS FPI chip optimized for 500 nm is presented; the operation range is λ = 450 – 550 nm with FWHM between 8 – 15 nm. Also a configuration of two cascaded FPIs (λ = 500 nm and λ = 650 nm) combined with an RGB colour camera is presented. With this tandem configuration, the overall wavelength tuning range of MEMS hyperspectral imagers can be extended to cover a larger range than with a single FPI chip. The potential applications of mobile hyperspectral imagers in the vis-NIR range include authentication, counterfeit detection and potential health/wellness and food sensing applications. © (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Référence : Rissanen, A., Saari, H., Rainio, K., Stuns, I., Viherkanto, K., Holmlund, C., … & Ojanen, H. (2016, May). MEMS FPI-based smartphone hyperspectral imager. In SPIE Commercial+ Scientific Sensing and Imaging (pp. 985507-985507). International Society for Optics and Photonics.