Title :
Performance Enhancement of Vibration Sensing Employing Multiple Phase-Shifted Fiber Bragg Grating
Author :
Azmi, Asrul Izam ; Sen, Deep ; Sheng, Wenjuan ; Canning, John ; Peng, Gang-Ding
Author_Institution :
Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales Sydney, Sydney, NSW, Australia
Abstract :
Multiple phase-shifted fiber Bragg gratings (MPS-FBGs) are proposed for a novel intensity-type vibration sensing scheme with broadband source based interrogation. In this scheme, the collective and simultaneous operation of the subchannels of MPS-FBG multiplies the total acquired signal power change at a particular channel, considerably enhancing sensitivity. Compared to a standard FBG scheme, our experiment scheme attained significant sensitivity enhancement of nearly 20 dB using 17 phase-shifted FBG. These experimental results agree with the theoretical prediction based on cross-correlation relations. The sensitivity enhancement while retaining the system simplicity would be an attractive option for an economical coarse wavelength division multiplexed (CWDM) vibration sensing system based on a single broadband source.
Keywords :
Bragg gratings; fibre optic sensors; vibration measurement; wavelength division multiplexing; broadband source based interrogation; coarse wavelength division multiplexing; cross correlation relations; multiple phase-shifted fiber Bragg grating; sensitivity enhancement; signal power change; vibration sensing; Broadband communication; Fiber gratings; Reflectivity; Sensitivity; Sensors; Vibrations; Fiber grating; multiple phase-shifted; multiple subchannels sensing; vibration sensor;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2011.2169940
