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Proceedings Paper

Development of a low cost SWIR spectrometer for low resource settings (Conference Presentation)

Paper Abstract

Optical spectroscopic devices have historically been too expensive or not portable enough to take full advantage of their abilities to offer real-time, on-site, objective results, especially in the developing world. Recent advancements toward smaller and cheaper hardware, especially in the visible and near infrared (NIR) ranges, could enable widespread use in low resource settings, down to a rural health clinic or at the individual farm level. We recently designed and tested a spectroscopic device with these goals in mind. It is based on an initial commercial version of a low cost MEMS spectral detection chip operating in the NIR, or more properly short wave infrared (SWIR) region. Custom optics, electronics, and mechanical designs were created to produce a complete handheld system capable of operation in the lab or in the field. Initial lab testing indicated excellent reproducibility both within and between five different devices. We have verified desired performance (e.g. acceptable signal to noise for target integration times, spectral features equivalent to lab-grade devices, etc.) for applications including pharmaceutical analysis and for analyzing multiple agricultural materials, including soils, plants, fertilizers, and manures. We have also developed a custom mobile app to accompany the devices in upcoming field testing, which will validate their performance in realistic settings in sub-Saharan Africa.

Paper Details

Date Published: 4 March 2019
Proc. SPIE 10869, Optics and Biophotonics in Low-Resource Settings V, 1086916 (4 March 2019); doi: 10.1117/12.2512007
Show Author Affiliations
Matthew D. Keller, Intellectual Ventures Lab. (United States)
James W. Stafford, Intellectual Ventures Lab. (United States)
Wenbo Wang, Intellectual Ventures Lab. (United States)
Ryan Calderon, Intellectual Ventures Lab. (United States)
Benjamin K. Wilson, Intellectual Ventures Lab. (United States)

Published in SPIE Proceedings Vol. 10869:
Optics and Biophotonics in Low-Resource Settings V
David Levitz; Aydogan Ozcan, Editor(s)

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