12 May 2016 MEMS FPI-based smartphone hyperspectral imager
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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.
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Anna Rissanen, Anna Rissanen, Heikki Saari, Heikki Saari, Kari Rainio, Kari Rainio, Ingmar Stuns, Ingmar Stuns, Kai Viherkanto, Kai Viherkanto, Christer Holmlund, Christer Holmlund, Ismo Näkki, Ismo Näkki, Harri Ojanen, Harri Ojanen, "MEMS FPI-based smartphone hyperspectral imager", Proc. SPIE 9855, Next-Generation Spectroscopic Technologies IX, 985507 (12 May 2016); doi: 10.1117/12.2229575; https://doi.org/10.1117/12.2229575

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