FMCW addressing of a fiber Bragg grating sensor array

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

doi:10.1117/12.417887

23 February 2001 FMCW addressing of a fiber Bragg grating sensor array

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

Proceedings Volume 4357, Distributed Fiber Optical Sensors and Measuring Networks; (2001) https://doi.org/10.1117/12.417887
Event: Distributed Fiber Optical Sensors and Measuring Networks, 2000, none, Russian Federation

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 from 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 2 (mu) (epsilon) resolution in terms of root-mean-square strain value.

Citation Download Citation

Peter K. C. Chan, Wei Jin, and M. Suleyman Demokan "FMCW addressing of a fiber Bragg grating sensor array", Proc. SPIE 4357, Distributed Fiber Optical Sensors and Measuring Networks, (23 February 2001); https://doi.org/10.1117/12.417887

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