Results 241 to 250 of about 77,948 (279)

Time-Expansion in Distributed Acoustic Sensing

26th Optoelectronics and Communications Conference, 2021
We demonstrate a technique to achieve a customized temporal expansion of the time-domain trace in a phase-sensitive reflectometer, that allows the interrogation of fibers with high resolution (~2 cm) using only low-bandwidth photodetection (~MHz). © 2021 The Author(s)
Miguel Gonzalez-Herraez, Miguel Soriano-Amat, Vicente Durán, Hugo F. Martins, Sonia Martin-Lopez, María R. Fernández-Ruiz   +5 more
openaire   +1 more source

SNR characterization in distributed acoustic sensing

SPIE Proceedings, 2016
In this paper we study the SNR associated with acoustic detection in Rayleigh-based Distributed Acoustic Sensing (DAS) systems. The study is focused on phase sensitive DAS due to its superiority in terms of linearity and sensitivity. Since DAS is based on coherent interference of backscattered light from multiple scatterers it is prone to signal fading.
Haniel Gabai, Avishay Eyal
openaire   +1 more source

Distributed Acoustic and Seismic Sensing

OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference, 2007
An overview of fiber optic distributed acoustic and seismic sensor system architectures is presented.
openaire   +1 more source

Distributed acoustic sensing of subsea wells

The Leading Edge, 2020
Abstract Topside distributed acoustic sensing (DAS) of subsea wells requires advanced optical engineering solutions to compensate for reduced acoustic bandwidth, optical losses, and back reflections that are accumulated through umbilicals, multiple wet- and dry-mate optical connectors, splices, optical feedthrough systems, and ...
Andreas Ellmauthaler, Brian C. Seabrook, Glenn A. Wilson, John Maida, Jeff Bush, Michel LeBlanc, James Dupree, Mauricio Uribe   +7 more
openaire   +1 more source

Nonlinear amplification in φ-OTDR for distributed acoustic sensing

European Workshop on Optical Fibre Sensors (EWOFS 2023), 2023
A low-noise φ-OTDR sensor is developed by adding a 2-stage pre-amplification system mixing linear and nonlinear amplification in a 3x3 Michelson interferometric configuration. Its performance is evaluated by deploying it as a distributed acoustic sensing system in a survey well (sampling rate: 10 kHz), showing noise floor levels below 1 n?.
Rossi, Leonardo, Cheng, Lun-Kai, De Jong, Wim, Jansen, Rob, Bolognini, Gabriele   +4 more
openaire   +2 more sources

Source Detection and Tracking for Underwater Distributed Acoustic Sensing [PDF]

2024 32nd European Signal Processing Conference (EUSIPCO)
Distributed Optical Fiber Sensing (DOFS) transforms conventional fiber optic cables into an extensive network of continuous sensors. It achieves this by exploiting the spectral, polarization and/or phase sensitivity of the propagating light to measurands of temperature, strain, pressure, vibrations etc.
Drylerakis, Konstantinos Theofilos, Belal, Mohammad, Mestre, Rafael, Norman, Timothy J., Evers, Christine   +4 more
openaire   +3 more sources

Xdas: a Python Framework for Distributed Acoustic Sensing

Seismological Research Letters
Xdas is a Python library designed to manipulate Distributed Acoustic Sensing (DAS) data. It provides a unified abstraction for reading any DAS file format into a standardized Python object, streamlining data handling across different acquisition systems.
Alister Trabattoni, Marie Baillet, Martijn van den Ende, Diane Rivet, Eleonore Stutzmann, Claudio Strumia, Francesco Biagioli   +6 more
openaire   +1 more source

Distributed Acoustic Sensing for Geophysical Monitoring

Proceedings, 2012
Distributed Acoustic Sensing (DAS), a rapidly evolving fiber-optic based technology for permanent in-well and geophysical monitoring, has been used to record VSP data in multiple Shell assets onshore Canada, USA, Europe, and the Middle East. Useful in-well velocity data were gathered from the entire length of the well from wellhead to TD (up to 4 km ...
J. Mestayer, S. Grandi Karam, B. Cox, P. Wills, A. Mateeva, J. Lopez, D. Hill, A. Lewis   +7 more
openaire   +1 more source

How sensitive is distributed acoustic sensing?

Seventh European Workshop on Optical Fibre Sensors, 2019
We present fundamental limits on the strain resolution of phase sensitive distributed acoustic sensing based on considerations of thermal noise. These limits suggest that, despite ongoing advances, distributed sensors are unlikely to approach the sensing performance of traditional geophones and hydrophones.
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Distributed acoustic sensing: System and experiments

2017 Opto-Electronics and Communications Conference (OECC) and Photonics Global Conference (PGC), 2017
This paper presents a fully distributed fiber acoustic sensing (DAS) system. Combined with the phase-sensitive optical time domain reflectrometry (Φ-OTDR) technology and phase generated carrier (PGC) demodulation technology, the system can detect and acquire seismic wave signal in real time.
Tuanwei Xu, Gaosheng Fang, Yue Jiang, Jianfeng Huang, Fang Li   +4 more
openaire   +1 more source