High Sensitive Multiplexed FBG Micro-Seismic Monitoring System

Author

Qi, Haifeng ; Liu, Tongyu ; Wang, Chang ; Wang, Jinyu ; Liu, Xiaohui

Author_Institution

Shandong Key Lab. of Opt. Fiber Sensing Technol., Shandong Acad. of Sci., Jinan, China

fYear

2011

fDate

16-18 May 2011

Firstpage

1

Lastpage

3

Abstract

The multiplexed fiber Bragg grating (FBG) micro seismic monitoring system with high sensitivity based on wavelength division multiplexing (WDM) and narrow line-width laser filtering demodulation is introduced. The highly sensitive acceleration probe based on FBG and a kind of cantilever structure is used in the system. The wavelength dynamic change of FBG is interrogated by narrow line-width laser filtering with the laser wavelength automatically locked at the midpoint of the edge of FBG spectrum. The minimum detectable acceleration is less than 1mm/s² with a flat response from 5Hz to 200Hz. Owning the special advantages in high sensitivity and multiplexing property, the system shows great prospect in micro-seismic detection, geological disasters detecting, and mechanical vibration measurement.

Keywords

Bragg gratings; acceleration measurement; cantilevers; demodulation; disasters; optical fibres; seismology; seismometers; vibration measurement; wavelength division multiplexing; FBG based acceleration probe; FBG wavelength dynamic change; WDM; acceleration detection; cantilever structure; fiber Bragg grating; geological disaster detection; high sensitivity multiplexed FBG; mechanical vibration measurement; microseismic detection; multiplexed FBG microseismic monitoring system; narrow line width laser filtering demodulation; wavelength division multiplexing; Fiber gratings; Sensors; Strain; Wavelength division multiplexing;

fLanguage

English

Publisher

ieee

Conference_Titel

Photonics and Optoelectronics (SOPO), 2011 Symposium on

Conference_Location

Wuhan

ISSN

2156-8464

Print_ISBN

978-1-4244-6555-2

Type

conf

DOI

10.1109/SOPO.2011.5780639

Filename

5780639