Spatial Resolution Improvement for phi-OTDR Sensors via Weak Fiber Bragg Gratings

Stepanov, K. V.; Zhirnov, A. A.; Chernutsky, Anton O.; Choban, T.V.; Pnev, Alexey B.; Lopunov, A.I.; Butov, Oleg V.

doi:10.1109/iclo48556.2020.9285505

Cited by 5 publications

(2 citation statements)

References 4 publications

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“…However, the large structures monitored were not communication lines but pipelines and roads [ 18 , 19 , 20 , 21 ]. In the last few years, there have been works on the introduction of optical reflectometers with sensors based on weak Fiber Bragg Gratings (FBGs), which allow for increasing the sensitivity of the system and obtaining data with less noise [ 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

Fiber-Optic Telecommunication Network Wells Monitoring by Phase-Sensitive Optical Time-Domain Reflectometer with Disturbance Recognition

Zhirnov,

Chesnokov,

Stepanov

et al. 2023

Sensors

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The paper presents the application of a phase-sensitive optical time-domain reflectometer (phi-OTDR) in the field of urban infrastructure monitoring. In particular, the branched structure of the urban network of telecommunication wells. The encountered tasks and difficulties are described. The possibilities of usage are substantiated, and the numerical values of the event quality classification algorithms applied to experimental data are calculated using machine learning methods. Among the considered methods, the best results were shown by convolutional neural networks, with a probability of correct classification as high as 98.55%.

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Section: Introductionmentioning

confidence: 99%

Fiber-Optic Telecommunication Network Wells Monitoring by Phase-Sensitive Optical Time-Domain Reflectometer with Disturbance Recognition

Zhirnov,

Chesnokov,

Stepanov

et al. 2023

Sensors

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“…Scientists at the University of Texas under the leadership of GF Taylor introduced FOSs based on phase-sensitive reflectometry in the early 1990s [13][14][15]. Over the past years, many studies have been carried out on these systems in various directions, including signal recognition [9,16,17], increasing the range of the controlled area [8,[18][19][20], and increasing the system's spatial resolution [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity Improvement of Phi-OTDR by Fiber Cable Coils

Stepanov

Zhirnov

Koshelev

et al. 2021

Sensors

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We present a theoretical and experimental study in which we increased the sensitivity of a phase-sensitive optical time-domain reflectometer (phi-OTDR). This was achieved by constructing coils in the sensor cable, which increased the total amplitude of the impact on the fiber. We demonstrate this theoretically using the example of a phase-sensitive reflectometer model and practically in testing grounds with a buried nearby conventional sensor and a sensor with coils. The sensitivity increased 2.2 times. We detected 95% of events when using coils, versus 20% when using a straight cable. The suggested method does not require any modifications to the device.

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Strength properties of femtosecond-induced defects and weak Bragg gratings for distributed optical fiber sensors

Butov

Przhiialkovskii

Lopunov

et al. 2023

Optics & Laser Technology

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Spatial Resolution Improvement for phi-OTDR Sensors via Weak Fiber Bragg Gratings

Cited by 5 publications

References 4 publications

Fiber-Optic Telecommunication Network Wells Monitoring by Phase-Sensitive Optical Time-Domain Reflectometer with Disturbance Recognition

Fiber-Optic Telecommunication Network Wells Monitoring by Phase-Sensitive Optical Time-Domain Reflectometer with Disturbance Recognition

Sensitivity Improvement of Phi-OTDR by Fiber Cable Coils

Strength properties of femtosecond-induced defects and weak Bragg gratings for distributed optical fiber sensors

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