Remote optical gas sensor integrated in glass by coherence modulation and active phase readout using an integrated LiNbO3 Mach-Zehnder

Wilhelm Elflein; Henri Porte; Pierre Benech; Isabelle Schanen-Duport

doi:10.1117/12.318197

13 August 1998 Remote optical gas sensor integrated in glass by coherence modulation and active phase readout using an integrated LiNbO₃ Mach-Zehnder

Wilhelm Elflein, Henri Porte, Pierre Benech, Isabelle Schanen-Duport

Author Affiliations +

Proceedings Volume 3555, Optical and Fiber Optic Sensor Systems; (1998) https://doi.org/10.1117/12.318197
Event: Photonics China '98, 1998, Beijing, China

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.

Citation Download Citation

Wilhelm Elflein, Henri Porte, Pierre Benech, and Isabelle Schanen-Duport "Remote optical gas sensor integrated in glass by coherence modulation and active phase readout using an integrated LiNbO₃ Mach-Zehnder", Proc. SPIE 3555, Optical and Fiber Optic Sensor Systems, (13 August 1998); https://doi.org/10.1117/12.318197

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