Abstract

A coherence multiplexing scheme for distributed sensors based on fiber Bragg grating (FBG) pairs is introduced. Each pair of identical FBGs forms a Fabry–Pérot (FP) interferometer (FPI) and induces an additional optical path difference (OPD) that is proportional to the center-to-center interval between the two FBGs (one for sensing and the other for reference). The interference intensity reaches its maximum when the FPI-induced OPD is compensated by scanning one arm of a Michelson interferometer to a certain position. The variation of the measurand induces a mismatch between the central reflection wavelengths of two FBGs and consequently reduces interference intensity. To separate the interferometric signals for demultiplexing, the intervals between the two FBGs are preset to different values for different sensors. In order to improve the multiplexing ability of the system and reduce the crosstalk among the sensors, we use gratings of low reflectivity. Temperature sensing is demonstrated to show the high sensitivity (-1.92 %/°C) and low crosstalk of our distributed sensing system.

© 2007 IEEE

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2007 (1)

Z. G. Guan, B. Zhou, G. Liu, S. He, "Quasi-distributed absorption sensing system based on a coherent multiplexing technique ," IEEE Photon. Technol. Lett. 19, 792-794 (2007).

2006 (1)

Z. G. Guan, A. P. Zhang, M. Jiang, S. He, "Low-coherence interrogation scheme for multiplexed sensors based on long-period-grating Mach–Zehnder interferometers," IEEE Photon. Technol. Lett. 18, 832-834 (2006).

2005 (1)

1998 (1)

U. Wiedmann, P. Gallion, G. H. Duan, "A generalized approach to optical low-coherence reflectometry including spectral filtering effects ," J. Lightw. Technol. 16, 1343-1347 (1998).

1997 (2)

T. Erdogan, "Fiber grating spectra," J. Lightw. Technol. 15, 1277-1294 (1997).

A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, "Fiber grating sensors," J. Lightw. Technol. 15, 1442-1463 (1997).

1995 (2)

M. A. Davis, A. D. Kersey, "Application of a fiber Fourier transform spectrometer to the detection of wavelength-encoded signals from Bragg grating sensors," J. Lightw. Technol. 13, 1289-1295 (1995).

W. V. Sorin, D. M. Baney, "Multiplexed sensing using optical low-coherence reflectometry," IEEE Photon. Technol. Lett. 7, 917-919 (1995).

1994 (2)

M. A. Davis, A. D. Kersey, "All-fiber Bragg grating strain-sensors demodulation technique using a wavelength division coupler ," Electron. Lett. 30, 75-76 (1994).

R. S. Weis, A. D. Kersey, T. A. Berkoff, "A four-element fiber grating sensor array with phase-sensitive detection," IEEE Photon. Technol. Lett. 6, 1469-1471 (1994).

1993 (1)

1985 (1)

J. L. Brooks, R. H. Wentworth, R. C. Youngquist, M. Tur, B. Y. Kim, H. J. Shaw, "Coherence multiplexing of fiber-optic interferometric sensors," J. Lightw. Technol. LT-3, 1062-1072 (1985).

Electron. Lett. (1)

M. A. Davis, A. D. Kersey, "All-fiber Bragg grating strain-sensors demodulation technique using a wavelength division coupler ," Electron. Lett. 30, 75-76 (1994).

IEEE Photon. Technol. Lett. (4)

R. S. Weis, A. D. Kersey, T. A. Berkoff, "A four-element fiber grating sensor array with phase-sensitive detection," IEEE Photon. Technol. Lett. 6, 1469-1471 (1994).

Z. G. Guan, A. P. Zhang, M. Jiang, S. He, "Low-coherence interrogation scheme for multiplexed sensors based on long-period-grating Mach–Zehnder interferometers," IEEE Photon. Technol. Lett. 18, 832-834 (2006).

Z. G. Guan, B. Zhou, G. Liu, S. He, "Quasi-distributed absorption sensing system based on a coherent multiplexing technique ," IEEE Photon. Technol. Lett. 19, 792-794 (2007).

W. V. Sorin, D. M. Baney, "Multiplexed sensing using optical low-coherence reflectometry," IEEE Photon. Technol. Lett. 7, 917-919 (1995).

J. Lightw. Technol. (5)

M. A. Davis, A. D. Kersey, "Application of a fiber Fourier transform spectrometer to the detection of wavelength-encoded signals from Bragg grating sensors," J. Lightw. Technol. 13, 1289-1295 (1995).

U. Wiedmann, P. Gallion, G. H. Duan, "A generalized approach to optical low-coherence reflectometry including spectral filtering effects ," J. Lightw. Technol. 16, 1343-1347 (1998).

T. Erdogan, "Fiber grating spectra," J. Lightw. Technol. 15, 1277-1294 (1997).

J. L. Brooks, R. H. Wentworth, R. C. Youngquist, M. Tur, B. Y. Kim, H. J. Shaw, "Coherence multiplexing of fiber-optic interferometric sensors," J. Lightw. Technol. LT-3, 1062-1072 (1985).

A. D. Kersey, M. A. Davis, H. J. Patrick, M. LeBlanc, K. P. Koo, "Fiber grating sensors," J. Lightw. Technol. 15, 1442-1463 (1997).

Opt. Lett. (2)

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