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Proceedings Paper

Spectral interferometric sensors for gases and liquids using integrated optical devices
Author(s): Jan Ingenhoff; Guenter Gauglitz; Norbert Fabricius
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Paper Abstract

Investigations for a sensor application with an integrated optical (IO) interferometric arrangement are presented. One of the two waveguide arms of an IO-Mach-Zehnder- interferometer is covered with a thin layer of polysiloxane (superstrate), which is sensitive to hydrocarbons. The dielectric IO-devices are fabricated by IOT. Gases of organic compounds including halogenated and non-halogenated hydrocarbons cause a change of the polysiloxan's refractive index followed by an increase or decrease of the effective refractive index of the covered waveguide arm. The resulting phase shift between the guided light in the measuring and the reference arm depends on the detection wavelength and the concentration of gas. Using an LED as the light source the spectral interferogram becomes observable and so order and phase of the signal can be determined. The aim of this work is the development of a reversibly working, miniaturized sensor with a short response time. The advantages of spectral observation of the interference are discussed. A comparison between measured and calculated spectral interference signals is given.

Paper Details

Date Published: 30 April 1993
PDF: 11 pages
Proc. SPIE 1796, Chemical, Biochemical, and Environmental Fiber Sensors IV, (30 April 1993); doi: 10.1117/12.143571
Show Author Affiliations
Jan Ingenhoff, Univ. of Tuebingen (Germany)
Guenter Gauglitz, Univ. of Tuebingen (Germany)
Norbert Fabricius, IOT Entwicklungsgesellschaft fuer Integrierte Optik Technologie GmbH (Germany)

Published in SPIE Proceedings Vol. 1796:
Chemical, Biochemical, and Environmental Fiber Sensors IV
Robert A. Lieberman, Editor(s)

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