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 |
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Pages (from-to) | 66-76 |
Number of pages | 11 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 4357 |
DOIs | |
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