A5080507148- Underwater Acoustics Research
- Seismic Waves and Analysis
- Underwater Vehicles and Communication Systems
- Advanced Fiber Optic Sensors
- Marine animal studies overview
- Advanced Fiber Laser Technologies
- Arctic and Antarctic ice dynamics
- Photonic and Optical Devices
- Oceanographic and Atmospheric Processes
- Photonic Crystal and Fiber Optics
- Geophysics and Sensor Technology
- Seismic Imaging and Inversion Techniques
Norwegian University of Science and Technology
2022
Uninett (Norway)
2021
Norwegian University of Life Sciences
2021
We demonstrate distributed acoustic sensing (DAS) by interrogation of Rayleigh backscattering from fibers with long linearly frequency modulated pulses and coherent detection. This system provides sustained real-time phase demodulation without inline amplification over a range 148 km in standard single mode fiber up to 171 low-loss OFS TeraWave SCUBA 125 fiber. is the longest reported for DAS measurements. The optical dynamic recording 57 dB. With 10 fiber, we obtain record-low noise above...
Abstract Our oceans are critical to the health of our planet and its inhabitants. Increasing pressures on marine environment triggering an urgent need for continuous comprehensive monitoring stressors, including anthropogenic activity. Current ocean observational systems expensive have limited temporal spatial coverage. However, there exists a dense network fibre-optic (FO) telecommunication cables, covering both deep coastal areas around globe. FO cables untapped potential advanced acoustic...
In a post-industrial whaling world, flagship and charismatic baleen whale species are indicators of the health our oceans. However, traditional monitoring methods provide spatially temporally undersampled data to evaluate mitigate impacts increasing climatic anthropogenic pressures for conservation. Here we present first case wildlife using distributed acoustic sensing (DAS). By repurposing globally-available infrastructure sub-sea telecommunication fiber optic (FO) cables, DAS can (1)...
Distributed acoustic sensing (DAS) transforms submarine telecommunication cables into densely sampled seismic receivers. To demonstrate DAS applications for imaging, we have used an optical cable on the seafloor in Trondheimsfjord, Norway, to record data generated by a controlled source. The are simultaneously recorded towed hydrophone array and fiber-optic cable. Following our processing methods, can produce images of underlying geologic structures from data. We find that comparable...
Distributed acoustic sensing (DAS) leverages an ocean-bottom telecommunication fiber-optic cable into a densely sampled array of strain sensors. We demonstrate DAS applications to passive monitoring through experiment on submarine in Longyearbyen, Svalbard, Norway. find that can measure many types signals the frequency range from 0.01 20 Hz generated by dynamics atmosphere, ocean, and solid earth. These include loading pressure fluctuation ocean surface waves storms, winds, airflow...
In a post-industrial whaling world, flagship and charismatic baleen whale species are indicators of the health our oceans. However, traditional monitoring methods provide spatially temporally undersampled data to evaluate mitigate impacts increasing climatic anthropogenic pressures for conservation. Here we present first case wildlife using distributed acoustic sensing (DAS). By repurposing globally-available infrastructure sub-sea telecommunication fiber optic (FO) cables, DAS can (1)...
Summary For this extended abstract, a 120 km long fibre-optic cable has been used to enhance the Signal-to-Noise Ratio of recorded P- and S-wave signals from local earthquake estimate hypocenter location. The Distributed Acoustic Sensing (DAS) technique provides unique possibility increase receiver density globally. It can, for example, improve detection rate small, induced earthquakes in CO2 storage sites or producing oil gas fields. This work shows how DAS alone can be locate small...
Our oceans are critical to the health of our planet and its inhabitants. Increasing pressures on marine environment triggering an urgent need for continuous comprehensive monitoring stressors, including anthropogenic activity. Current ocean observational systems expensive have limited temporal spatial coverage. However, there exists a dense network Fibre-Optic (FO) telecommunication cables, covering
Distributed acoustic sensing (DAS) transforms submarine telecommunication cables into densely sampled seismic receivers. To demonstrate DAS applications for imaging, we use an optical cable on the seafloor in Trondheim Fjord, Norway, to record data generated by a controlled source. The are simultaneously recorded towed hydrophone array and fiber optic cable. Following our processing methods, can produce images of underlying geological structures from both data. We find that have comparable...
We demonstrate sustained real-time phase-recording distributed acoustic sensing (DAS) in 148 km standard SMF28e and 171 low-loss OFS TeraWave SCUBA 125 fibers without inline amplification. Low noise high optical dynamic range are obtained by combining swept frequency interrogation a very low phase laser.
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Oceans. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]Observation atmospheric oceanic dynamics using ocean-bottom distributed acoustic sensingAuthorsKittinatTaweesintananoniDMartinLandrøiDStåle EmilJohansenJohn...