Fiber-Optic Distributed Vibration Sensing Provides Technique for Detecting Sand Production

2010 ◽  
Author(s):  
Stephen Mullens ◽  
Gareth Lees ◽  
Giles Duvivier
Keyword(s):  
Fiber Optic ◽  
Sand Production ◽  
Vibration Sensing

Distributed single fiber optic vibration sensing with high frequency response and multi-points accurate location

2020 ◽  
Vol 129 ◽  
pp. 106060 ◽  
Author(s):  
Pengfei Ma ◽  
Kun Liu ◽  
Zhenshi Sun ◽  
Junfeng Jiang ◽  
Shuang Wang ◽  
...  
Keyword(s):  
Frequency Response ◽  
High Frequency ◽  
Fiber Optic ◽  
Single Fiber ◽  
High Frequency Response ◽  
Vibration Sensing

Fiber optic vibration sensing and neural networks methods for prediction of composite beam delamination

1997 ◽  
Author(s):  
Gilbert W. Sanders ◽  
Farhad Akhavan ◽  
Steve E. Watkins ◽  
K. Chandrashekhara
Keyword(s):  
Neural Networks ◽  
Composite Beam ◽  
Fiber Optic ◽  
Vibration Sensing

Statistical-mode sensor for fiber optic vibration sensing uses

1989 ◽  
Vol 28 (15) ◽  
pp. 3166 ◽  
Author(s):  
W. B. Spillman ◽  
B. R. Kline ◽  
L. B. Maurice ◽  
P. L Fuhr
Keyword(s):  
Fiber Optic ◽  
Vibration Sensing ◽  
Statistical Mode

scholarly journals Enhanced Distributed Fiber Optic Vibration Sensing and Simultaneous Temperature Gradient Sensing Using Traditional C-OTDR and Structured Fiber with Scattering Dots

Sensors ◽  
2019 ◽  
Vol 19 (19) ◽  
pp. 4114 ◽  
Author(s):  
Konstantin Hicke ◽  
René Eisermann ◽  
Sebastian Chruscicki
Keyword(s):  
Fiber Optic ◽  
Low Frequency ◽  
Single Mode ◽  
Cost Effective ◽  
Time Domain Reflectometry ◽  
Gradient Sensing ◽  
Beneficial Effects ◽  
Vibration Sensing ◽  
Optical Time ◽  
And Performance

We present results demonstrating several beneficial effects on distributed fiber optic vibration sensing (DVS) functionality and performance resulting from utilizing standard single mode optical fiber (SMF) with femtosecond laser-inscribed equally-spaced simple scattering dots. This modification is particularly useful when using traditional single-wavelength amplitude-based coherent optical time domain reflectometry (C-OTDR) as sensing method. Local sensitivity is increased in quasi-distributed interferometric sensing zones which are formed by the fiber segments between subsequent pairs of the scattering dots. The otherwise nonlinear transfer function is overwritten with that of an ordinary two-beam interferometer. This linearizes the phase response to monotonous temperature variations. Furthermore, sensitivity fading is mitigated and the demodulation of low-frequency signals is enabled. The modification also allows for the quantitative determination of local temperature gradients directly from the C-OTDR intensity traces. The dots’ reflectivities and thus the induced attenuation can be tuned via the inscription process parameters. Our approach is a simple, robust and cost-effective way to gain these sensing improvements without the need for more sophisticated interrogator technology or more complex fiber structuring, e.g., based on ultra-weak FBG arrays. Our claims are substantiated by experimental evidence.

scholarly journals Judge the Extent of the Harm on Electric Cables Based on Optical Fiber Sensing Technology and Found a New Mechanism of Patrolling Electric Cables

2020 ◽  
Vol 185 ◽  
pp. 01071
Author(s):  
Xianjin Yang ◽  
Jingqing Ye ◽  
Guangyuan Yao ◽  
Junfeng Chi ◽  
Jiali Du
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Power Grids ◽  
Efficient Mechanism ◽  
Buried Cables ◽  
Fiber Sensing ◽  
Sensing Technology ◽  
Vibration Sensing ◽  
Optical Fiber Sensing ◽  
Electric Cables

The article comes up with a measure that uses fiber vibration sensing technology to avoid external intrusion harm on electric cables, dealing with the problem that buried cables are sometimes destroyed by constructions. This measure is based on dual Mach-Zehnder(M-Z) interference, and it makes use of power grids’ fiber-optic cables laid in the cable trench—along with the electric cables—as sensors. These sensors could monitor vibration near to optical cables and trench, and recognize the events that vibrate the cable, and finally judge the extent of the harm caused by the events. The article also try to find out a more reliable and more efficient mechanism of patrolling electric cables, which is based on the abovementioned measure.

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