Frequency division multiplexing of FBG sensors using an FMCW approach

Peter K. C. Chan; Wei Jin; M. Suleyman Demokan

doi:10.1117/12.396411

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24 August 2000 Frequency division multiplexing of FBG sensors using an FMCW approach

Peter K. C. Chan, Wei Jin, M. Suleyman Demokan

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Proceedings Volume 4073, Fifth European Conference on Smart Structures and Materials; (2000) https://doi.org/10.1117/12.396411
Event: Symposium on Applied Photonics, 2000, Glasgow, United Kingdom

Abstract

We report on the use of a frequency-modulated continuous wave (FMCW) technique for multiplexing fiber Bragg grating (FBG) sensors. This technique is based on the modulation of light intensity for a broadband source by a linear swept-frequency RF carrier. Signals from the FBG sensors located at different positions in an array are separated in frequency-domain and demodulated using a tunable optical filter. The potential and limitation of the technique are discussed. A 3-sensor FMCW multiplexed FBG array of parallel topology and a 6-sensor hybrid FMCW/WDM system were experimentally demonstrated with -30 dB crosstalk between sensors and a 2(mu) (epsilon) resolution in terms of root-mean- square strain value.

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Peter K. C. Chan, Wei Jin, and M. Suleyman Demokan "Frequency division multiplexing of FBG sensors using an FMCW approach", Proc. SPIE 4073, Fifth European Conference on Smart Structures and Materials, (24 August 2000); https://doi.org/10.1117/12.396411

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