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Proceedings Paper

MEMS FPI-based smartphone hyperspectral imager
Author(s): Anna Rissanen; Heikki Saari; Kari Rainio; Ingmar Stuns; Kai Viherkanto; Christer Holmlund; Ismo Näkki; Harri Ojanen
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Paper Abstract

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.

Paper Details

Date Published: 12 May 2016
PDF: 16 pages
Proc. SPIE 9855, Next-Generation Spectroscopic Technologies IX, 985507 (12 May 2016); doi: 10.1117/12.2229575
Show Author Affiliations
Anna Rissanen, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Heikki Saari, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Kari Rainio, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Ingmar Stuns, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Kai Viherkanto, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Christer Holmlund, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Ismo Näkki, VTT Technical Research Ctr. of Finland Ltd. (Finland)
Harri Ojanen, VTT Technical Research Ctr. of Finland Ltd. (Finland)


Published in SPIE Proceedings Vol. 9855:
Next-Generation Spectroscopic Technologies IX
Mark A. Druy; Richard A. Crocombe, Editor(s)

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