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Proceedings Paper

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

Paper Details

Date Published: 17 October 2012
PDF: 4 pages
Proc. SPIE 8421, OFS2012 22nd International Conference on Optical Fiber Sensors, 84212W (17 October 2012); doi: 10.1117/12.970474
Show Author Affiliations
Paula A. R. Tafulo, INESC Porto (Portugal)
Univ. do Porto (Portugal)
L. Coelho, INESC Porto (Portugal)
Univ. do Porto (Portugal)
P. A. S. Jorge, INESC Porto (Portugal)
J. L. Santos, INESC Porto (Portugal)
Univ. do Porto (Portugal)
Kay Schuster, Institute of Photonic Technology (Germany)
Jens Kobelke, Institute of Photonic Technology (Germany)
O. Frazão, INESC Porto (Portugal)

Published in SPIE Proceedings Vol. 8421:
OFS2012 22nd International Conference on Optical Fiber Sensors
Yanbiao Liao; Wei Jin; David D. Sampson; Ryozo Yamauchi; Youngjoo Chung; Kentaro Nakamura; Yunjiang Rao, Editor(s)

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