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Proceedings Paper

Remote optical gas sensor integrated in glass by coherence modulation and active phase readout using an integrated LiNbO3 Mach-Zehnder
Author(s): Wilhelm Elflein; Henri Porte; Pierre Benech; Isabelle Schanen-Duport
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Paper Abstract

We describe in this paper a sensor system dedicated to the measurement of concentration of organic gases. This system is based on the sue of coherence modulation and allows a remote interferometric measurement. Two different integrated optics technologies are required in a complementary way. Integrated optics in glass is used to realize the sensor itself, whereas lithium niobate technology is used for the demodulation process which performs an active phase read- out. The sensor uses a polymer material whose refractive index varies with the gas concentration, and thus modifies the characteristics of the evanescent part of the wave propagating in the glass waveguide. Experimentally, a sensitivity of 0.8rad/Vol percent is obtained with the vapor of ethanol, and 0.2rad/vol percent for butane.

Paper Details

Date Published: 13 August 1998
PDF: 8 pages
Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); doi: 10.1117/12.318197
Show Author Affiliations
Wilhelm Elflein, Univ. de Franche-Comte (Germany)
Henri Porte, Univ. de Franche-Comte (France)
Pierre Benech, ENSERG (France)
Isabelle Schanen-Duport, ENSERG (France)

Published in SPIE Proceedings Vol. 3555:
Optical and Fiber Optic Sensor Systems
Shanglian Huang; Kim D. Bennett; David A. Jackson, Editor(s)

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