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Proceedings Paper

Frequency division multiplexing of FBG sensors using an FMCW approach
Author(s): Peter K. C. Chan; Wei Jin; M. Suleyman Demokan
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Paper 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.

Paper Details

Date Published: 24 August 2000
PDF: 6 pages
Proc. SPIE 4073, Fifth European Conference on Smart Structures and Materials, (24 August 2000); doi: 10.1117/12.396411
Show Author Affiliations
Peter K. C. Chan, Hong Kong Polytechnic Univ. (Hong Kong)
Wei Jin, Hong Kong Polytechnic Univ. (Hong Kong)
M. Suleyman Demokan, Hong Kong Polytechnic Univ. (Hong Kong)


Published in SPIE Proceedings Vol. 4073:
Fifth European Conference on Smart Structures and Materials
Pierre Francois Gobin; Clifford M. Friend, Editor(s)

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