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Proceedings Paper

Miniature FT-IR spectrometer for passive and active sensing
Author(s): Christopher Manning; Mike Gross; Joshah Jennings; John Wuthrich; Alan Samuels
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Paper Abstract

A novel handheld Fourier-transform infrared spectrometer (FTS) system, currently in development, is described. Estimated and measured performance data presented here are based on modeling and preliminary testing. The basic instrument will be useful for a variety of sensing applications, including chemical agent detection. One novel aspect is a refractively-scanned, field-widened interferometer, providing, in a miniature footprint, energy equal to a laboratory spectrometer. A second novel aspect is the use of solid-phase extraction to concentrate airborne chemicals for infrared detection. FTS instruments provide a powerful approach to identification of chemical and biological substances. The specificity is very high, while the sensitivity varies with sampling interfaces and detection methods. Cost, size, sensitivity and weight have impeded the widespread deployment of FTS systems. Cost can be reduced by a variety of means, including improved designs, mass production, and the on-going electronics and manufacturing revolutions. Size can be addressed by the use of field widening, which has been known for many years, though seldom used. Photoacoustic detection provides a very low-cost and relatively sensitive sampling interface. Modeling indicates that the sensitivity can reach part per billion to part per trillion levels.

Paper Details

Date Published: 25 October 2006
PDF: 9 pages
Proc. SPIE 6378, Chemical and Biological Sensors for Industrial and Environmental Monitoring II, 63780T (25 October 2006); doi: 10.1117/12.690078
Show Author Affiliations
Christopher Manning, Manning Applied Technology (United States)
Mike Gross, Manning Applied Technology (United States)
Joshah Jennings, Manning Applied Technology (United States)
John Wuthrich, Manning Applied Technology (United States)
Alan Samuels, U.S. Army Aberdeen Proving Ground (United States)


Published in SPIE Proceedings Vol. 6378:
Chemical and Biological Sensors for Industrial and Environmental Monitoring II
Steven D. Christesen; Arthur J. Sedlacek; James B. Gillespie; Kenneth J. Ewing, Editor(s)

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