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Proceedings Paper

Low-cost OP-FTIR spectrometer for workplace monitoring
Author(s): Julia H. Rentz; James R. Engel; David L. Carlson; David J. Mansur; Robert M. Vaillancourt; George J. Genetti; Peter R. Griffiths; Husheng Yang
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Paper Abstract

OPTRA has developed a low-cost, extremely compact, rugged open-path Fourier transform infrared (OP-FTIR) spectrometer for workplace air quality monitoring. This research was funded under a United States Air Force ABIR Phase II contract. The goal of the program has been to identify and alleviate all aspects of currently available OP-FTIR systems which result in high-cost and complex user requirements. This low-resolution ssytem (Δσ = 8 cm-1) employs an uncooled DLATGS detector and a novel encoder-based reference metrology. Other design economies include a plastic injection-molded retroreflector array to return the open-path beam. This effort has included the development of a set of algorithms based on artificial neural networks (ANNs) and partial least squares (PLS) by the University of Idaho; these algorithms are specifically tailored to low-resolution systems applied to multi-component analysis of large, organic molecules characterized by broad infrared resonance bands. The algorithms, coupled with our OP-FTIR, are designed to autonomously identify and quantify a list of 105 common industrial organic molecules in the presence of varying humidity levels. Our system includes two PCI boards which host all OP-FTIR processing and servo electronics; the boards reside in a small suit-case PC along with a user-friendly Graphical User Interface.

Paper Details

Date Published: 8 March 2004
PDF: 12 pages
Proc. SPIE 5272, Industrial and Highway Sensors Technology, (8 March 2004); doi: 10.1117/12.514059
Show Author Affiliations
Julia H. Rentz, OPTRA, Inc. (United States)
James R. Engel, OPTRA, Inc. (United States)
David L. Carlson, OPTRA, Inc. (United States)
David J. Mansur, OPTRA, Inc. (United States)
Robert M. Vaillancourt, OPTRA, Inc. (United States)
George J. Genetti, OPTRA, Inc. (United States)
Peter R. Griffiths, Univ. of Idaho (United States)
Husheng Yang, Univ. of Idaho (United States)

Published in SPIE Proceedings Vol. 5272:
Industrial and Highway Sensors Technology
Brian Culshaw; Samuel David Crossley; Helmut E. Knee; Michael A. Marcus; John P. Dakin, Editor(s)

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