DocumentCode :
2590338
Title :
Distributed Fiber Optic In-Line Intrusion Sensor System
Author :
Fang, Nian ; Jia, Dongjian ; Wang, Lutang ; Huang, Zhaoming
Author_Institution :
Key Lab. of Specialty Fiber Opt. & Opt. Access Networks, Shanghai Univ., Shanghai
fYear :
2008
fDate :
10-12 Sept. 2008
Firstpage :
608
Lastpage :
611
Abstract :
A novel fiber optic in-line distributed sensor system for location of an intrusion is proposed. A 3 dB coupler and a Faraday rotation mirror (FRM) are employed to form an interferometer. There are two light paths that have the same optical length but travel different sequence paths in the interferometer. These two paths pass through the intrusion point at different time, so the phase difference is existent. After interference, a fast Fourier transform (FFT) is applied on the output signal to obtain the phase angle in the double intrusion frequency. And then the position of the intrusion point can be determined. Simulation results show that this fiber optic in-line distributed sensor system can locate the intrusion point at a distance of 40 km, with the deviation no more than 130 m, and the relative error is 0.32%.
Keywords :
Faraday effect; distributed sensors; fast Fourier transforms; fibre optic sensors; integrated optics; light interferometers; mirrors; optical fibre couplers; safety systems; Faraday rotation mirror; coupler; distributed fiber optic in-line intrusion sensor system; fast Fourier transform; interferometer; optical length; phase angle; phase difference; Fast Fourier transforms; Mirrors; Optical fiber polarization; Optical fiber sensors; Optical fibers; Optical interferometry; Optical sensors; Optical signal processing; Sagnac interferometers; Sensor systems; Fast Fourier transform (FFT); in-line distributed fiber optical sensors; intrusion detection; phase angle;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Microwave Conference, 2008 China-Japan Joint
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-3821-1
Type :
conf
DOI :
10.1109/CJMW.2008.4772505
Filename :
4772505
Link To Document :
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