Linearization and pulse-coding of phase-sensitive OTDR for distributed acoustic sensing

2018 ◽  
Author(s):  
Bin Zhang ◽  
Zinan Wang ◽  
Shengtao Lin ◽  
Yun Fu ◽  
Ji Xiong ◽  
...  
Keyword(s):  
Acoustic Sensing ◽  
Phase Sensitive ◽  
Distributed Acoustic Sensing

Kilometer-range distributed acoustic sensing by time- expanded phase-sensitive time-domain reflectometry

2021 ◽  
Author(s):  
Miguel Soriano-Amat ◽  
Hugo F. Martins ◽  
Luis Costa ◽  
Sonia Martin-Lopez ◽  
Miguel Gonzalez-Herraez ◽  
...  
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Acoustic Sensing ◽  
Phase Sensitive ◽  
Distributed Acoustic Sensing

scholarly journals Recent Advances in Distributed Acoustic Sensing Based on Phase-Sensitive Optical Time Domain Reflectometry

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Yonas Muanenda
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Fiber Optic Sensor ◽  
Acoustic Sensing ◽  
Rayleigh Backscattering ◽  
Recent Advances ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Distributed Acoustic Sensing ◽  
Optical Time

Distributed acoustic sensing (DAS) using coherent Rayleigh backscattering in an optical fiber has become a ubiquitous technique for monitoring multiple dynamic events in real time. It has continued to constitute a steadily increasing share of the fiber-optic sensor market, thanks to its interesting applications in many safety, security, and integrity monitoring systems. In this contribution, an overview of the recent advances of research in DAS based on phase-sensitive optical time domain reflectometry (ϕ-OTDR) is provided. Some advanced techniques used to enhance the performance of ϕ-OTDR sensors for measuring backscattering intensity changes through reduction of measurement noise are presented, in addition to methods used to increase the dynamic measurement capacity of ϕ-OTDR schemes beyond conventional limits set by the sensing distance. Recent ϕ-OTDR configurations which significantly enhance the measurement spatial resolution, including those which decouple it from the probing pulse width, are also discussed. Finally, a review of recent advances in more precise quantitative measurement of an external impact based on frequency shift and phase demodulation methods using simple direct detection ϕ-OTDR schemes is given.

scholarly journals Distributed Acoustic Sensing Using Chirped-Pulse Phase-Sensitive OTDR Technology

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4368 ◽  
Author(s):  
María R. Fernández-Ruiz ◽  
Luis Costa ◽  
Hugo F. Martins
Keyword(s):  
Direct Detection ◽  
Low Cost ◽  
High Sensitivity ◽  
Coherent Detection ◽  
Simple Method ◽  
Acoustic Sensing ◽  
Chirped Pulse ◽  
Distributed Sensor ◽  
Phase Sensitive ◽  
Distributed Acoustic Sensing

In 2016, a novel interrogation technique for phase-sensitive (Φ)OTDR was mathematically formalized and experimentally demonstrated, based on the use of a chirped-pulse as a probe, in an otherwise direct-detection-based standard setup: chirped-pulse (CP-)ΦOTDR. Despite its short lifetime, this methodology has now become a reference for distributed acoustic sensing (DAS) due to its valuable advantages with respect to conventional (i.e., coherent-detection or frequency sweeping-based) interrogation strategies. Presenting intrinsic immunity to fading points and using direct detection, CP-ΦOTDR presents reliable high sensitivity measurements while keeping the cost and complexity of the setup bounded. Numerous technique analyses and contributions to study/improve its performance have been recently published, leading to a solid, highly competitive and extraordinarily simple method for distributed fibre sensing. The interesting sensing features achieved in these last years CP-ΦOTDR have motivated the use of this technology in diverse applications, such as seismology or civil engineering (monitoring of pipelines, train rails, etc.). Besides, new areas of application of this distributed sensor have been explored, based on distributed chemical (refractive index) and temperature-based transducer sensors. In this review, the principle of operation of CP-ΦOTDR is revisited, highlighting the particular performance characteristics of the technique and offering a comparison with alternative distributed sensing methods (with focus on coherent-detection-based ΦOTDR). The sensor is also characterized for operation in up to 100 km with a low cost-setup, showing performances close to the attainable limits for a given set of signal parameters [≈tens-hundreds of pe/sqrt(Hz)]. The areas of application of this sensing technology employed so far are briefly outlined in order to frame the technology.

Distributed Acoustic Sensing Based on Pulse-Coding Phase-Sensitive OTDR

2019 ◽  
Vol 6 (4) ◽  
pp. 6117-6124 ◽  
Author(s):  
Zinan Wang ◽  
Bin Zhang ◽  
Ji Xiong ◽  
Yun Fu ◽  
Shengtao Lin ◽  
...  
Keyword(s):  
Acoustic Sensing ◽  
Phase Sensitive ◽  
Distributed Acoustic Sensing
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