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

Volume

29

Issue

22

fYear

2011

Firstpage

3453

Lastpage

3460

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;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/JLT.2011.2169940

Filename

6030894