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Proceedings Paper

Miniature near-infrared spectrometer for point-of-use chemical analysis
Author(s): Donald M. Friedrich; Charles A. Hulse; Marc von Gunten; Eric P. Williamson; Christopher G. Pederson; Nada A. O'Brien
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Paper Abstract

Point-of-use chemical analysis holds tremendous promise for a number of industries, including agriculture, recycling, pharmaceuticals and homeland security. Near infrared (NIR) spectroscopy is an excellent candidate for these applications, with minimal sample preparation for real-time decision-making. We will detail the development of a golf ball-sized NIR spectrometer developed specifically for this purpose. The instrument is based upon a thin-film dispersive element that is very stable over time and temperature, with less than 2 nm change expected over the operating temperature range and lifetime of the instrument. This filter is coupled with an uncooled InGaAs detector array in a small, rugged, environmentally stable optical bench ideally suited to unpredictable environments. The resulting instrument weighs less than 60 grams, includes onboard illumination and collection optics for diffuse reflectance applications in the 900-1700 nm wavelength range, and is USB-powered. It can be driven in the field by a laptop, tablet or even a smartphone. The software design includes the potential for both on-board and cloud-based storage, analysis and decision-making. The key attributes of the instrument and the underlying design tradeoffs will be discussed, focusing on miniaturization, ruggedization, power consumption and cost. The optical performance of the instrument, as well as its fit-for purpose will be detailed. Finally, we will show that our manufacturing process has enabled us to build instruments with excellent unit-to-unit reproducibility. We will show that this is a key enabler for instrumentindependent chemical analysis models, a requirement for mass point-of-use deployment.

Paper Details

Date Published: 8 March 2014
PDF: 11 pages
Proc. SPIE 8992, Photonic Instrumentation Engineering, 899203 (8 March 2014); doi: 10.1117/12.2040669
Show Author Affiliations
Donald M. Friedrich, JDSU (United States)
Charles A. Hulse, JDSU (United States)
Marc von Gunten, JDSU (United States)
Eric P. Williamson, JDSU (United States)
Christopher G. Pederson, JDSU (United States)
Nada A. O'Brien, JDSU (United States)

Published in SPIE Proceedings Vol. 8992:
Photonic Instrumentation Engineering
Yakov G. Soskind; Craig Olson, Editor(s)

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