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Proceedings Paper

In-line monitoring of volatile organic compounds with multiplexed reflectometric sensors
Author(s): Jens Seemann; Gerolf Kraus; Guenter Gauglitz
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Paper Abstract

We present a multiplexed fiber-optical sensor system for in-line monitoring of volatile organic compounds in air. The transducer consists of sensitive polymer films coated on glass substrates, a source of white light, a fiber-optical multiplexed and a photodiode array detector. It is based on the interferometric (phase sensitive) measurement of the change of optical parameters (thickness and refractive index) of the polymer film when exposed to volatile organic compound (VOCs) vapors. Polymer films swell fast and reversibly depending on the concentration of analyte in the vapor phase and the coefficient of distribution between ambient medium and polymer bulk. We shortly review the transducer's physical and chemical properties, and describe its applicability in sensor arrays, including internal referencing, and the perspectives in process control. This opens a way to rugged pattern recognition and multicomponent analysis of fairly complex mixtures of VOCs.

Paper Details

Date Published: 15 September 1995
PDF: 7 pages
Proc. SPIE 2507, Distributed and Multiplexed Fiber Optic Sensors V, (15 September 1995); doi: 10.1117/12.219609
Show Author Affiliations
Jens Seemann, Univ. Tuebingen (Germany)
Gerolf Kraus, Univ. Tuebingen (Germany)
Guenter Gauglitz, Univ. Tuebingen (Germany)

Published in SPIE Proceedings Vol. 2507:
Distributed and Multiplexed Fiber Optic Sensors V
John P. Dakin; Alan D. Kersey, Editor(s)

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