Title :
Enhanced FBG strain sensing multiplexing capacity using combination of intensity and wavelength dual-coding technique
Author :
Zhang, L. ; Liu, Y. ; Williams, J.A.R. ; Bennion, I.
Author_Institution :
Photonics Res. Group, Aston Univ., Birmingham, UK
Abstract :
A novel concept for interrogating a fiber Bragg grating sensor array using intensity and wavelength dual-coded multiplexing (IWDM) is proposed and evaluated. In comparison with conventional wavelength-division-multiplexed sensor systems, IWDM allows the number of sensing gratings in an array to be doubled without sacrificing dynamic range and without additional cost or complexity of interrogation. A practical strain sensing system based on IWDM and using specifically produced gratings with a dual-peaked spectral response has been demonstrated with 50-Hz interrogation rate and 1 μ/spl epsiv/ resolution.
Keywords :
Bragg gratings; fibre optic sensors; intelligent sensors; optical arrays; strain sensors; wavelength division multiplexing; 1 /spl mu//spl epsiv/ resolution; 50 Hz; 50-Hz interrogation rate; IWDM; dual-peaked spectral response; dynamic range; enhanced FBG strain sensing multiplexing capacity; fiber Bragg grating sensor array; intensity wavelength dual-coded multiplexing; wavelength dual-coding technique; Bragg gratings; Capacitive sensors; Dynamic range; Fiber gratings; Intelligent structures; Optical sensors; Sensor arrays; Sensor systems; Strain measurement; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
