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 ±48.7kPa and ±20.1kPa, respectively.

© 2012 Optical Society of America

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References

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2012 (1)

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

2011 (1)

2010 (1)

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

2008 (1)

2006 (1)

2005 (1)

Y. Z. Zhu and A. B. Wang, IEEE Photon. Technol. Lett. 17, 447 (2005).
[CrossRef]

Araujo, F. M.

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

Coelho, L.

Cooper, K. L.

Ferreira, M. S.

Frazao, O.

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

M. S. Ferreira, L. Coelho, K. Schuster, J. Kobelke, J. L. Santos, and O. Frazao, Opt. Lett. 36, 4029 (2011).
[CrossRef]

Gong, Y. A.

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Guo, Y.

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Han, Y. K.

Jorge, P. A. S.

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

Kobelke, J.

Li, Y. J.

Rao, Y. J.

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Santos, J. L.

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

M. S. Ferreira, L. Coelho, K. Schuster, J. Kobelke, J. L. Santos, and O. Frazao, Opt. Lett. 36, 4029 (2011).
[CrossRef]

Schuster, K.

Tafulo, P. A. R.

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

Tsai, H. L.

Wang, A. B.

Wang, X. W.

Weber, M. J.

M. J. Weber, Handbook of Optical Materials (CRC Press, 2003).

Wei, T.

Wu, Y.

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Xiao, H.

Xu, J. C.

Zhao, T. A.

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Zhu, Y. Z.

IEEE Photon. Technol. Lett. (2)

Y. A. Gong, Y. Guo, Y. J. Rao, T. A. Zhao, and Y. Wu, IEEE Photon. Technol. Lett. 22, 1708 (2010).
[CrossRef]

Y. Z. Zhu and A. B. Wang, IEEE Photon. Technol. Lett. 17, 447 (2005).
[CrossRef]

IEEE Sensors J. (1)

P. A. R. Tafulo, P. A. S. Jorge, J. L. Santos, F. M. Araujo, and O. Frazao, IEEE Sensors J. 12, 8 (2012).
[CrossRef]

Opt. Express (1)

Opt. Lett. (2)

Other (1)

M. J. Weber, Handbook of Optical Materials (CRC Press, 2003).

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Figures (4)

Fig. 1.
Fig. 1.

Experimental setup used to characterize the sensor with different gaseous environment.

Fig. 2.
Fig. 2.

(a) Spectrum of the light returned from the sensing head in a 100% CO2 atmosphere at 100 kPa pressure; (b) the two components of the spectrum.

Fig. 3.
Fig. 3.

Results of the wavelength shift obtained with pressure variation for both interferometers: (a) using pure O2 and (b) using pure CO2.

Fig. 4.
Fig. 4.

Time response of the sensor obtained with a mixture of O2 and CO2: (a) wavelength shift of both cavities spectra for the gases; (b) result for O2 detection; (c) result CO2 detection.

Equations (5)

Equations on this page are rendered with MathJax. Learn more.

[ΔPCO2ΔPO2]=1D[KFP(O2)KM(O2)KFP(CO2)KM(CO2)][ΔλMΔλFP],
[ΔPCO2ΔPO2]=12.05[6.391.803.581.33][ΔλMΔλFP].
ΔCCO2=ΔPCO2ΔPT×100,
ΔCO2=ΔPO2ΔPT×100.
[ΔCCO2ΔCO2]=12.05[6.391.803.581.33][ΔλM/CΔλFP/C].

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