| The large scale fiber grating array sensing system has found lots of applications in fields distributed in underwater,land,sky and space,which is often configured using TDM/WDM multiplexing schemes.In recent years,the integrated fabrication method without any fiber splicing points plays important roles in providing the largest system high reliability and robust detection performance.However,in such fiber grating array,the synthesis of fiber grating array without bringing any damage becomes a difficult problem.The existing reconstruction algorithms are only used for single fiber bragg grating.This paper will start with the fiber grating array which is formed by two low reflectivity FBGs and regarded as a special chirp fiber grating,then a proposal of synthesis the fiber grating array in time domain ispresented,which canalso suppressthe multi-reflections induced signal crosstalk.The research results will provide a solution tothe synthesis of the integrated fiber grating array and a new signal processing method to suppress the array signal crosstalk.Paper main research results are as follows:1.The spectral characteristicsofa single FBG optical fiber Bragg grating andfiber grating arrayare analyzed in theoretical derivation and simulation.we also introduced the production technology of fiber grating and produced a single FBG and two primitives fiber bragg grating array.2.We study the Fourier transform and shock response characteristics of TDM/WDM multiplexingfiber grating array.We have a thorough study of fiber Bragg grating reconstruction algorithm.We analyzed the theory of implementation,advantages and disadvantages of each algorithm and key technology.3.We achieve the gratings synthesis for a single fiber bragg grating and we analyze the influencing factors of the algorithm in detail.Finally,we verify the feasibility of the algorithm by using the measured data.Based on the layer-peeling synthesis method,we design a method to reconstruct the cascaded fiber Bragg grating. |
PDF Full Text Request