scholarly journals Note: Gaussian mixture model for event recognition in optical time-domain reflectometry based sensing systems

2016 ◽  
Vol 87 (3) ◽  
pp. 036107 ◽  
Author(s):  
A. K. Fedorov ◽  
M. N. Anufriev ◽  
A. A. Zhirnov ◽  
K. V. Stepanov ◽  
E. T. Nesterov ◽  
...  
Keyword(s):  
Gaussian Mixture Model ◽  
Mixture Model ◽  
Time Domain ◽  
Gaussian Mixture ◽  
Time Domain Reflectometry ◽  
Event Recognition ◽  
Sensing Systems ◽  
Optical Time Domain Reflectometry ◽  
Optical Time

scholarly journals Recent Advances in Phase-Sensitive Optical Time Domain Reflectometry (Ф-OTDR)

2021 ◽  
Vol 11 (1) ◽  
pp. 1-30
Author(s):  
Yunjiang Rao ◽  
Zinan Wang ◽  
Huijuan Wu ◽  
Zengling Ran ◽  
Bing Han
Keyword(s):  
Fiber Optics ◽  
Time Domain ◽  
Acoustic Waves ◽  
Rapid Development ◽  
Development Stage ◽  
Time Domain Reflectometry ◽  
Rayleigh Backscattering ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time

AbstractPhase-sensitive optical time domain reflectometry (Ф-OTDR) is an effective way to detect vibrations and acoustic waves with high sensitivity, by interrogating coherent Rayleigh backscattering light in sensing fiber. In particular, fiber-optic distributed acoustic sensing (DAS) based on the Ф-OTDR with phase demodulation has been extensively studied and widely used in intrusion detection, borehole seismic acquisition, structure health monitoring, etc., in recent years, with superior advantages such as long sensing range, fast response speed, wide sensing bandwidth, low operation cost and long service lifetime. Significant advances in research and development (R&D) of Ф-OTDR have been made since 2014. In this review, we present a historical review of Ф-OTDR and then summarize the recent progress of Ф-OTDR in the Fiber Optics Research Center (FORC) at University of Electronic Science and Technology of China (UESTC), which is the first group to carry out R&D of Ф-OTDR and invent ultra-sensitive DAS (uDAS) seismometer in China which is elected as one of the ten most significant technology advances of PetroChina in 2019. It can be seen that the Ф-OTDR/DAS technology is currently under its rapid development stage and would reach its climax in the next 5 years.

Influence of laser linewidth on performance of Brillouin optical time domain reflectometry

2013 ◽  
Vol 22 (7) ◽  
pp. 074214 ◽  
Author(s):  
Yun-Qi Hao ◽  
Qing Ye ◽  
Zheng-Qing Pan ◽  
Hai-Wen Cai ◽  
Rong-Hui Qu
Keyword(s):  
Time Domain ◽  
Time Domain Reflectometry ◽  
Laser Linewidth ◽  
Optical Time Domain Reflectometry ◽  
Optical Time

scholarly journals Faseroptische Überwachung von mechanisch deformierten Kabelgeflechtsstrukturen mittels optischer Zeitbereichsreflektrometrie / Fiber-optic monitoring of mechanically deformed cable structures by means of optical time-domain reflectometry

2018 ◽  
Vol 85 (s1) ◽  
pp. s73-s79
Author(s):  
Moritz A. Graf ◽  
Fabian Ehmer ◽  
Christoph Eisermann ◽  
Martin Jakobi ◽  
Alexander W. Koch
Keyword(s):  
Time Domain ◽  
Fiber Optic ◽  
Time Domain Reflectometry ◽  
Cable Structures ◽  
Optical Time Domain Reflectometry ◽  
Optical Time

Zusammenfassung In diesem Beitrag wird ein neuartiger Ansatz zur Schadensdetektion in Stromversorgungskabeln vorgestellt. Die Funktionalität des Messsystems kann bezüglich des durch Makrobiegungen induzierten Anstiegs des Dämpfungsbelags verifiziert werden. Durch den verwendeten Integrationsansatz sind Mantelschäden im Stromversorgungskabel detektierbar, wodurch langfristige Ausfallgründe frühzeitig erkannt werden. Über eine integrierte optische Faser und ein optisches Zeitbereichsreflektometer kann unabhängig von der elektrischen Energieübertragung im Kabel eine exakte und effiziente Schadenslokalisierung sichergestellt werden, was wiederum eine Zeit- und Kostenersparnis zur Folge hat.

scholarly journals Sub-Meter Spatial Resolution Phase-Sensitive Optical Time-Domain Reflectometry System Using Double Interferometers

2018 ◽  
Vol 8 (10) ◽  
pp. 1899 ◽  
Author(s):  
Shengwen Feng ◽  
Tuanwei Xu ◽  
Jianfen Huang ◽  
Yang Yang ◽  
Lilong Ma ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Time Domain ◽  
Time Domain Reflectometry ◽  
Bilateral Filtering ◽  
Rayleigh Backscattering ◽  
Detection Frequency ◽  
Optical Time Domain Reflectometry ◽  
Phase Sensitive ◽  
Optical Time ◽  
Phase Generated Carrier

An improved phase-sensitive optical time-domain reflectometry (φ-OTDR) system with sub-meter spatial resolution is demonstrated. Two Michelson interferometers (MIs) with different path length differences are used in the proposed system. One is 10 m, the other is 9.2 m. Two Rayleigh backscattering phase traces with different spatial resolution are obtained by a phase generated carrier (PGC) algorithm at adjacent times. After using differencing and adaptive 2-D bilateral filtering algorithms, a 0.8-m spatial resolution over 2 km is achieved. Experimental results indicate that the system shows an extraordinary linearity as high as 99.94% with amplitude-modulation and acquires a detection frequency from 5 to 500 Hz.

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