Simultaneous measurement of partial pressure of O2 and CO2 using hybrid interferometer

Paula A. R. Tafulo; L. Coelho; P. A. S. Jorge; J. L. Santos; Kay Schuster; Jens Kobelke; O. Frazão

doi:10.1117/12.970474

17 October 2012 Simultaneous measurement of partial pressure of O₂ and CO₂ using hybrid interferometer

Paula A. R. Tafulo, L. Coelho, P. A. S. Jorge, J. L. Santos, Kay Schuster, Jens Kobelke, O. Frazão

Proceedings Volume 8421, OFS2012 22nd International Conference on Optical Fiber Sensors; 84212W (2012) https://doi.org/10.1117/12.970474
Event: OFS2012 22nd International Conference on Optical Fiber Sensor, 2012, Beijing, China

Abstract

In this work, a hybrid interferometer for simultaneous measurement of the partial pressures of O₂ and CO₂ mixtures is reported. The sensing head consist in two different interferometers based on a Fabry-Perot cavity and a modal interference configuration. The intrinsic FP cavity was created by splicing a single mode fiber (SMF28) with a graded index fiber section that was then subjected to chemical etching creating a cavity. The second interferometer is based on a splice of a pure silica tube in series with the Fabry-Pérot. Due to the design, different sensitivities are achieved for the pressure inducing refractive index changes of each gas. The rms deviations were found to be ± 0.079 kPa and ± 0.029 kPa for CO₂ and O₂ partial pressure measurements, respectively.

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Paula A. R. Tafulo, L. Coelho, P. A. S. Jorge, J. L. Santos, Kay Schuster, Jens Kobelke, and O. Frazão "Simultaneous measurement of partial pressure of O₂ and CO₂ using hybrid interferometer", Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84212W (17 October 2012); https://doi.org/10.1117/12.970474

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KEYWORDS

Interferometers

Carbon dioxide

Head

Sensors

Oxygen

Silica

Single mode fibers

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