Results 281 to 290 of about 80,178 (324)

On the sensitivity of distributed acoustic sensing

Optics Letters, 2016
In distributed acoustic sensing (DAS) an optical fiber is transformed into an array of thousands of "virtual microphones." Most current DAS methodologies are based on coherent interference of Rayleigh backscattered light and thus are prone to signal fading. Hence, the sensitivities of the "microphones" fluctuate randomly along the fiber.
Haniel, Gabai, Avishay, Eyal
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Distributed acoustic sensing for 2D and 3D acoustic source localization

Optics Letters, 2019
Distributed acoustic sensing (DAS) technology based on Rayleigh backscattering is experiencing a rapid development and leading itself into wider applications because of the unique capability of measuring sound and vibrations at all points along the sensing fiber.
Liang Jiajing, Wang Zhaoyong, Lu Bin, Wang Xiao, Li Luchuan, Ye Qing, Qu Ronghui, Cai Haiwen   +7 more
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Distributed acoustic sensing of subsea wells

The Leading Edge, 2020
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 downhole fibers. To address these
Andreas Ellmauthaler, Brian C. Seabrook, Glenn A. Wilson, John Maida, Jeff Bush, Michel LeBlanc, James Dupree, Mauricio Uribe   +7 more
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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.
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Silicon Photonic Distributed Acoustic Sensing Interrogator

28th International Conference on Optical Fiber Sensors, 2023
We demonstrate an integrated interrogator for distributed acoustic sensing on the silicon-on-insulator platform, whose performance is comparable to the discrete system.
Zhicheng Jin, Jiageng Chen, Yanming Chang, Qingwen Liu, Zuyuan He   +4 more
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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
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Detecting hydro-acoustic signals using Distributed Acoustics Sensing technology

The Journal of the Acoustical Society of America, 2022
Distributed Acoustic Sensing (DAS) is a relatively new technology that transforms fiber optic cables, typically used for telecommunications, into dense sensor arrays, capable of meter-scale recordings up to ∼100 km. The interest in these technologies for ocean exploration and monitoring has risen in recent years.
Shima Abadi, William S. Wilcock, Brad P. Lipovsky   +2 more
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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
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Quantum weak measurement enhanced distributed acoustic sensing

Optics Letters
An enhanced distributed acoustic sensing (DAS) is proposed based on an extended Mach–Zehnder interferometer utilizing quantum weak measurement. The acoustic signals are encoded as the relative phase of the polarized light in several channels by fibers between optical fiber Bragg gratings (FBGs).
Qingxin Deng, Hongjing Li, Qi Song, Zhiqiang Liu, Jingzheng Huang, Guihua Zeng   +5 more
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Horse Gait Identification Using Distributed Acoustic Sensing

IEEE Sensors Journal, 2021
In this paper field measurements are carried out using a distributed acoustic sensing system (DAS) for the identification of horse gait. The DAS system has a spatial resolution of 1 m, frequency range of 1–5 kHz and the fiber length is of about 70 m. The optical fiber cable lays down into trench of 15 cm of depth.
Uilian Jose Dreyer, Guilherme Dutra, Guilherme Heim Weber, Rafael Jose Daciuk, Manoel Feliciano da Silva, Ricardo Munoz Freitas, Daniel Rodrigues Pipa, Jean Carlos Cardozo da Silva, Marco Jose da Silva, Cicero Martelli   +9 more
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