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Proceedings Paper

FMCW addressing of a fiber Bragg grating sensor array
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 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.

Paper Details

Date Published: 23 February 2001
PDF: 11 pages
Proc. SPIE 4357, Distributed Fiber Optical Sensors and Measuring Networks, (23 February 2001); doi: 10.1117/12.417887
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. 4357:
Distributed Fiber Optical Sensors and Measuring Networks
Yuri N. Kulchin, Editor(s)

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