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Research On Distributed Fiber Bragg Grating Sensing System

Posted on:2012-11-14Degree:MasterType:Thesis
Country:ChinaCandidate:F ZouFull Text:PDF
GTID:2178330338991323Subject:Signal and Information Processing
Abstract/Summary:PDF Full Text Request
Fiber Bragg Grating(FBG) sensor has special advantages such as small volume, light weight, immunity of electromagnetic interference, and so on. It has been widely applied in measuring stress, temperature, displacement, and so on. It is a hotspot in the sensing field. Whereas single FBG sensor can not fully utilize the network resources, and it can not satisfy the actual demand of large-scale projects such as the mine and underground tunnel. Now people start to attach great importance to the distributed FBG sensing system.In the first place, sensing principle of fiber Bragg grating sensor and theoretic model of distributed FBG sensing network are analysed. Several multiplexing technologys are compared. A new type of fiber grating sensor network based on WDM and TDM is studied. It realizes wavelength division multiplexing technique with Arrayed Waveguide Grating(AWG), and employs TDM on each WDM channel with program-controlled switch. Compared with traditional series structural systems, the new type of network with tree structure has the advantages such as the large scale of network, high stability, etc.In the next place, a demodulation system based on tunable fiber F-P filter is disscussed. On each AWG channel, FBG sensor is placed as wavelength reference elements. it can correct the performance of the tunable F-P filter and increase demodulation accuracy of the system. For accomplishing the automatic measurement of the physical parameters and processing the mass data produced by the system, some data processing methods are discussed and analysed.In the end, the result of simulation analysis is obtained, describing the efficiency and rationality of the system.
Keywords/Search Tags:Fiber Bragg Grating, Distributed Fiber Bragg Grating Network, Arrayed Waveguide Grating, Tunable Fiber Fabry-Perot Filter
PDF Full Text Request
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