Frequency modulated continuous wave technique for referencing and multiplexing intensity based fibre optic sensors

R. A. Perez-Herrera; D. A. Pereira; O. Frazão; J. M. Castro Ferreira; J. L. Santos; F. M. Araújo; L. A. Ferreira; J. M. Baptista; M. Lopez-Amo

doi:10.1117/12.786121

16 May 2008 Frequency modulated continuous wave technique for referencing and multiplexing intensity based fibre optic sensors

R. A. Perez-Herrera, D. A. Pereira, O. Frazão, J. M. Castro Ferreira, J. L. Santos, F. M. Araújo, L. A. Ferreira, J. M. Baptista, M. Lopez-Amo

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Proceedings Volume 7004, 19th International Conference on Optical Fibre Sensors; 70044P (2008) https://doi.org/10.1117/12.786121
Event: 19th International Conference on Optical Fibre Sensors, 2008, Perth, WA, Australia

Abstract

We report on the use of a frequency-reflectometry domain technique for referencing optical intensity sensors located between two fibre Bragg gratings. The experiment combines the concept of frequency modulated continuous wave with the spectrally selective mirror properties of fibre Bragg gratings to interrogate with referencing properties intensity based sensors. Multiplexing two of these sensors using this technique in a parallel topology system was also experimentally demonstrated. Due to the use of different fibre lengths (delay lines), signals from the fibre Bragg gratings located at different positions in an array are separated in the frequency-domain.

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R. A. Perez-Herrera, D. A. Pereira, O. Frazão, J. M. Castro Ferreira, J. L. Santos, F. M. Araújo, L. A. Ferreira, J. M. Baptista, and M. Lopez-Amo "Frequency modulated continuous wave technique for referencing and multiplexing intensity based fibre optic sensors", Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70044P (16 May 2008); https://doi.org/10.1117/12.786121

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KEYWORDS

Sensors

Fiber Bragg gratings

Modulation

Multiplexing

Optical sensors

Fiber optics sensors

Modulators

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