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Proceedings Paper

Intrinsic fiber optical gas sensor based on surface plasmon resonance spectroscopy
Author(s): Matthias Niggemann; Andreas Katerkamp; Maria Pellmann; Peter Bolsmann; Joerg Reinbold; Karl Cammann
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Paper Abstract

A miniaturized fiber optical sensor based on surface plasmon resonance spectroscopy is investigated in view of the detection of organic solvent vapors, particularly tetrachloroethene. Surface plasmons are excited on a silver coated multimode fiber by polychromatic light, and the resonant excitation is detected as a resonant absorption band in the measured output spectrum. When the analyte is absorbed in a thin gas-sensitive polysiloxane film deposited on the silver layer the polymer film changes its thickness and its refractive index. These changes result in a wavelength shift of the resonant curve depending on the analyte gas concentration. Theoretical considerations about the sensing effect are made and resonance curves were computer-simulated. Based on this simulation the layout of all sensor parameters was optimized. The sensor shows an excellent response to tetrachloroethene with a response time of two seconds and high reporducibility. Using self-assembling monolayers on the silver surface a long-term stability of more than three months is obtained. The sensor shows low cross sensitivities less than 1% to other solvent vapors like aceton and ethanol, furthermore, the influence of humidity is very low. This miniaturized fiber optical sensor in combination with an easy-to-handle and non-sophisticated measuring and evaluation unit is excellently suitable for the remote sensing of special organic solvent vapors.

Paper Details

Date Published: 29 September 1995
PDF: 9 pages
Proc. SPIE 2508, Chemical, Biochemical, and Environmental Fiber Sensors VII, (29 September 1995); doi: 10.1117/12.221744
Show Author Affiliations
Matthias Niggemann, Univ. of Munster (Germany)
Andreas Katerkamp, Univ. of Munster (Germany)
Maria Pellmann, Univ. of Munster (Germany)
Peter Bolsmann, Univ. of Munster (Germany)
Joerg Reinbold, Univ. of Munster (Germany)
Karl Cammann, Univ. of Munster (Germany)

Published in SPIE Proceedings Vol. 2508:
Chemical, Biochemical, and Environmental Fiber Sensors VII
Annamaria V. Scheggi, Editor(s)

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