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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Alan E. Willner
  • Vol. 37, Iss. 15 — Aug. 1, 2012
  • pp: 3063–3065

Optics InfoBase > Optics Letters > Volume 37 > Issue 15 > Page 3063

Simultaneous measurement of partial pressure of O2 and CO2 with a hybrid interferometer

Luís Coelho, Paula A. R. Tafulo, Pedro A. S. Jorge, José L. Santos, Diana Viegas, Kay Schuster, Jens Kobelke, and Orlando Frazão  »View Author Affiliations


Optics Letters, Vol. 37, Issue 15, pp. 3063-3065 (2012)
http://dx.doi.org/10.1364/OL.37.003063


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Abstract

In this Letter, a hybrid interferometer for simultaneous measurement of the partial pressures of O2 and CO2 mixtures is reported. The sensing head consists in the combination of two interferometric structures, one a Fabry–Pérrot cavity and the other a modal interferometer. The intrinsic Fabry–Pérot was formed by splicing a single mode fiber with a graded index fiber length that was then subjected to chemical etching creating an air cavity. The second interferometer is based on a splice of a pure silica tube in series with the Fabry–Pérot. It was observed for a particular gas that its refractive index changes with pressure variation in a specific way, a characteristic that permitted the simultaneous measurement of partial pressures of CO2 and O2 with rms deviations of ∼±48.7  kPa and ∼±20.1  kPa, respectively.

© 2012 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.2370) Fiber optics and optical communications : Fiber optics sensors
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 14, 2012
Revised Manuscript: June 1, 2012
Manuscript Accepted: June 13, 2012
Published: July 16, 2012

Citation
Luís Coelho, Paula A. R. Tafulo, Pedro A. S. Jorge, José L. Santos, Diana Viegas, Kay Schuster, Jens Kobelke, and Orlando Frazão, "Simultaneous measurement of partial pressure of O2 and CO2 with a hybrid interferometer," Opt. Lett. 37, 3063-3065 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-15-3063

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