Enhancing Demodulation Performance of DCM Algorithm in φ-OTDR System Through Temporal Spline InterpolationOAEI
Enhancing Demodulation Performance of DCM Algorithm in φ-OTDR System Through Temporal Spline Interpolation
For expanding the amplitude-frequency response range of the differential cross-phase multiply(DCM)algorithm in the φ-OTDR system,a temporal spline interpolation(TSI)method is proposed to pre-process Rayleigh backscattering(RBS)signals.Through the TSI method,the discrete temporal signals characterizing RBS traces are subjected to interpolation,facilitating a reduction in differential approximation errors.This,in turn,establishes a heightened level of precision in phase demodulation,especially relevant across extensive sensing distances.By comparing the recovered time-domain waveforms and the corresponding power spectral densities without and with the TSI,the above improvement effect has been experimentally validated by utilizing the TSI.The results show that,with the TSI,the amplitude-frequency response range of the DCM algorithm is enlarged by 2.78 times,and the new relationship among fpulse,f,and D under the root mean square error(RMSE)tolerance less than 0.1 can be expressed as 1.9(D+1)f≤fpulse.This contribution underscores a substantial advancement in the capabilities of the DCM algorithm,holding promise for refined performance in optical fiber sensing applications.
Tingyu WANG;Jianzhong ZHANG;Zhe MA;Xiang HE;Weizhe LI;Binyuan YANG;Mingjiang ZHANG
Key Laboratory of Advanced Transducers and Intelligent Control Systems(Ministry of Education and Shanxi Province),Taiyuan University of Technology,Taiyuan 030024,ChinaCollege of Electronic Information and Optical Engineering,Taiyuan University of Technology,Taiyuan 030024,ChinaKey Laboratory of Advanced Transducers and Intelligent Control Systems(Ministry of Education and Shanxi Province),Taiyuan University of Technology,Taiyuan 030024,China||College of Physics,Taiyuan University of Technology,Taiyuan 030024,China||Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030024,China
φ-OTDRDCM algorithmphase demodulation3×3 couplertemporal spline interpolation
《光子传感器（英文版）》 2024 (003)
52-63 / 12
This work was supported in part by the National Natural Science Foundation of China(Grant Nos.62075153,62075151,and 62205237);in part by the Shanxi Provincial Key Research and Development Project(Grant No.202102150101004);in part by the Shanxi Provincial Central Guiding Local Science and Technology Development Fund Project(Grant No.YDZJSX20231A019);in part by National Key Research and Development Program of China(Grant No.2023YFF0715700);in part by Natural Science Foundation for Young Scientists of Shanxi Province(Grant No.20210302124396).
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