Title :
Multiplexing of fiber Bragg grating sensors using a FMCW technique
Author :
Chan, Peter K C ; Jin, W. ; Gong, J.M. ; Demokan, M.S.
Author_Institution :
Dept. of Electr. Eng., Hong Kong Polytech., Hung Hom, Hong Kong
Abstract :
We report on the use of a frequency-domain reflectometry technique for multiplexing fiber Bragg grating (FBG) sensors. This technique is based on the modulation of light intensity from a broadband source by a swept-frequency RF carrier. Signals from the FBG sensors located at different positions in an array are separated in the frequency-domain and demodulated using a tunable optical filter. A three FBG sensor system is experimentally demonstrated. The potential of the technique for multiplexing a large number of FBG sensors is discussed.
Keywords :
Bragg gratings; fibre optic sensors; frequency modulation; multiplexing; optical modulation; reflectometry; FMCW technique; broadband source; demodulated; fiber Bragg grating sensor multiplexing; frequency modulated continuous wave; frequency-domain; frequency-domain reflectometry technique; light intensity modulation; swept-frequency RF carrier; three FBG sensor system; tunable optical filter; Bragg gratings; Fiber gratings; Intensity modulation; Optical arrays; Optical filters; Optical modulation; Optical sensors; Radio frequency; Reflectometry; Sensor arrays;
Journal_Title :
Photonics Technology Letters, IEEE
