scholarly journals Preliminary assessment of shipping noise monitoring using Distributed Acoustic Sensing on an optical fiber telecom cable

2021 ◽  
Author(s):  
Diane Rivet ◽  
Benoit de Cacqueray ◽  
Anthony Sladen ◽  
Aurélien Roques ◽  
Gaëtan Calbris
Keyword(s):  
Optical Fiber ◽  
Preliminary Assessment ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing

scholarly journals Rose Parade Seismology: Signatures of Floats and Bands on Optical Fiber

2020 ◽  
Vol 91 (4) ◽  
pp. 2395-2398 ◽  
Author(s):  
Xin Wang ◽  
Ethan F. Williams ◽  
Martin Karrenbach ◽  
Miguel González Herráez ◽  
Hugo Fidalgo Martins ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing

Abstract The 2020 Rose Parade in Pasadena, California, was recorded by the Pasadena distributed acoustic sensing array, which utilizes the underground telecom fiber optic cables as sensors. The floats and bands generate remarkable broadband seismic signatures that can be captured at meters’ resolution.

Optical fiber hydrophone based on distributed acoustic sensing

2018 ◽  
Author(s):  
yang yang ◽  
Tuanwei Xu ◽  
Shengwen Feng ◽  
Jianfen Huang ◽  
Fang Li
Keyword(s):  
Optical Fiber ◽  
Acoustic Sensing ◽  
Distributed Acoustic Sensing

Precise Distributed Acoustic Sensing measurements by using seafloor optical fiber cable system for seismic monitoring

2020 ◽  
Author(s):  
Masanao Shinohara ◽  
Tomoaki Yamada ◽  
Takeshi Akuhara ◽  
KImihiro Mochizuki ◽  
Shin'ichi Sakai
Keyword(s):  
Optical Fiber ◽  
Single Mode ◽  
Gauge Length ◽  
Observation System ◽  
High Signal ◽  
Seismic Observation ◽  
Acoustic Sensing ◽  
Seafloor Observation ◽  
Optical Fiber Cable ◽  
Distributed Acoustic Sensing

<p>Distributed Acoustic Sensing (DAS) measurements which utilize an optical fiber itself as a sensor can be applied for various purposes. An observation of earthquakes using an optical fiber deployed on the seafloor with DAS technology is attractive because DAS measurements enable a dense seismic observation as a long linear array. Spatial resolution of the observation reaches a few meters. The length of the array is determined by the measurement range of the DAS interrogator deployed on the optical fiber, and a fine spatial sensor interval can be configured. DAS measurements have become increasingly accurate and the current state of technology exhibit high signal quality. Because DAS measurement is useful for earthquake observation, there were some trials for an observation of earthquakes using an optical fiber deployed on the land or the seafloor. However, There are few observations using DAS technology on seafloor until the present.</p><p>In 1996, a seafloor seismic tsunami observation system using an optical fiber cable was deployed off the coast of Sanriku by Earthquake Research Institute, the University of Tokyo. The system has three seismic stations and two tsunami-meters, and a length of the cable is approximately 115 km. The system has six spare (dark) optical fibers which are dispersion shifted single mode type, and have been incorporated for future extension of the observation system. We have started development of a seafloor seismic observation system utilizing DAS technology on the Sanriku cable observation system as a next generation of marine seismic observation system. In 2019, we performed DAS measurements using a dark fiber from Sanriku seafloor observation system three times. An interrogator was installed in the cable landing station temporarily. Data were recorded with various values of parameters, such as length of data collection (array aperture), gauge length, ping rate, acquisition offset, for evaluation of data quality and signal to noise ratios. The total recording period for three measurements was approximately three weeks. As a result, many earthquakes including micro-earthquakes were recorded. The obtained data will be used to develop data processing techniques for seismic observations utilizing DAS measurements.</p><p> </p>

scholarly journals Enhanced Optical Fiber for Distributed Acoustic Sensing beyond the Limits of Rayleigh Backscattering

iScience ◽  
2020 ◽  
Vol 23 (6) ◽  
pp. 101137 ◽  
Author(s):  
Paul S. Westbrook ◽  
Kenneth S. Feder ◽  
Tristan Kremp ◽  
Eric M. Monberg ◽  
Hongchao Wu ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Acoustic Sensing ◽  
Rayleigh Backscattering ◽  
Distributed Acoustic Sensing
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