This review begins by elucidating the rationale for selecting phase optical time domain reflectometry(Φ-OTDR)based on coherent detection as the subject of study,underscoring the necessity and significance of analyzin...This review begins by elucidating the rationale for selecting phase optical time domain reflectometry(Φ-OTDR)based on coherent detection as the subject of study,underscoring the necessity and significance of analyzing noise suppression methodologies.With the aid of in-phase/quadrature(I/Q)demodulation process for phase extraction,the review analyzes the impact of noise on phase-extracted results in coherentΦ-OTDR.Subsequently,nine specific implementable pathways to mitigate noise effects are explored within three categories:amplitude signal,phase signal,and the data itself.For each pathway,the review summarizes the advancements in noise suppression research,providing a typical implementation case to deepen the reader's understanding of noise processing principles and techniques.Finally,the review not only identifies the shortcomings but also provides insights into noise processing in coherentΦ-OTDR,underlining the current limitations and suggesting potential avenues for future investigation.展开更多
基金supported by the National Natural Science Foundation of China(No.62175100)the Jiangsu Province Industry-University-Research Collaboration Project(No.BY20230840)+1 种基金the Changzhou Institute of Technology Introduction Talent Research Startup Project(No.E3620720073)the Changzhou Sci&Tech Program(No.CJ20241050)。
文摘This review begins by elucidating the rationale for selecting phase optical time domain reflectometry(Φ-OTDR)based on coherent detection as the subject of study,underscoring the necessity and significance of analyzing noise suppression methodologies.With the aid of in-phase/quadrature(I/Q)demodulation process for phase extraction,the review analyzes the impact of noise on phase-extracted results in coherentΦ-OTDR.Subsequently,nine specific implementable pathways to mitigate noise effects are explored within three categories:amplitude signal,phase signal,and the data itself.For each pathway,the review summarizes the advancements in noise suppression research,providing a typical implementation case to deepen the reader's understanding of noise processing principles and techniques.Finally,the review not only identifies the shortcomings but also provides insights into noise processing in coherentΦ-OTDR,underlining the current limitations and suggesting potential avenues for future investigation.
