FMCW addressing of a fiber Bragg grating sensor array

P. K C Chan; Wei Jin; M. S. Demokan

doi:10.1117/12.417887

FMCW addressing of a fiber Bragg grating sensor array

P. K C Chan, Wei Jin, M. S. Demokan

The Hong Kong Polytechnic University

Research output: Journal article publication › Conference article › Academic research › peer-review

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 με resolution in terms of root-mean-square strain value.

Original language	English
Pages (from-to)	66-76
Number of pages	11
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	4357
DOIs	https://doi.org/10.1117/12.417887
Publication status	Published - 1 Jan 2001
Event	Distributed Fiber Optical Sensors and Measuring Networks - , Russian Federation Duration: 1 Jan 2001 → …

Keywords

Fiber Bragg grating sensors
Frequency-modulated continuous wave
Optical fiber sensors
Strain measurements

ASJC Scopus subject areas

Electrical and Electronic Engineering
Condensed Matter Physics

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10.1117/12.417887

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FMCW addressing of a fiber Bragg grating sensor array

Abstract

Keywords

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