Results 11 to 20 of about 8,553,533 (250)

Distributed acoustic sensing with Michelson interferometer demodulation [PDF]

Photonic Sensors, 2016
The distributed acoustic sensing (DAS) has been extensively studied and widely used. A distributed acoustic sensing system based on the unbalanced Michelson interferometer with phase generated carrier (PGC) demodulation was designed and tested.
Xiaohui Liu, Chen Wang, Ying Shang, Chang Wang, Wenan Zhao, Gangding Peng, Hongzhong Wang   +6 more
doaj   +2 more sources

Application of Distributed Acoustic Sensing in Vessel Detection [PDF]

EPJ Web of Conferences
Distributed Acoustic Sensing (DAS) leverages the sensitivity of optical fibers to detect environmental vibrations. This study demonstrates the capability of DAS to identify and characterize the acoustic signatures of passing vessels, highlighting its ...
van Golde Ilmer, Silva Susana, Sousa Ricardo, Pinto Paulo, Cândido Miguel, Frazão Orlando   +5 more
doaj   +2 more sources

Distributed Optical Fiber Acoustic Wave Sensing and Its Progress [PDF]

Guangtongxin yanjiu
Distributed optical fiber sensing technology uses optical fiber as the sensing transmission medium to obtain sound wave amplitude and phase along the optical fiber and process the corresponding information.
WANG Longsheng, XIE Xin, YAO Meng, ZOU Hui   +3 more
doaj   +2 more sources

Near‐Field Acoustic Imaging Using Fiber‐Optic Distributed Acoustic Sensing and Beamforming Techniques [PDF]

Advanced Science
Distributed acoustic sensors (DAS) detect mechanical vibrations along optical fibers with meter‐scale spatial resolution, capturing the waves directly reaching the fiber. Deploying dense fiber nets in two or three dimensions for spatially‐precise sensing
Marcelo A. Soto, Diego Badillo‐San‐Juan   +1 more
doaj   +2 more sources

Comparative Study of Distributed Acoustic Sensing Responses in Telecommunication Optical Cables [PDF]

Sensors
Distributed Acoustic Sensing (DAS) transforms conventional optical fibres into large-scale acoustic sensor arrays. While existing telecommunication cables are increasingly considered for DAS-based monitoring, their performance depends strongly on cable ...
Abdulfatah A. G. Abushagur, Mohd Ridzuan Mokhtar, Noor Shafikah Md Rodzi, Khazaimatol Shima Subari, Siti Azlida Ibrahim, Zulkifli Mahmud, Zulfadzli Yusoff, Andre Franzen, Hairul Abdul Rashid   +8 more
doaj   +2 more sources

Near-Wellbore Fracture Diagnosis via Strain Decoupling from Integrated In-Well LF-DAS and DTS Data [PDF]

Sensors
The low-frequency distributed acoustic sensing (LF-DAS) data acquired through fiber-optic cables cemented behind the fracturing well casing can dynamically capture the hydraulic fracturing process.
Jiayi Song, Weibo Sui, Huan Guo, Jiwen Li   +3 more
doaj   +2 more sources

Airborne Sound Sensing System Based on DAS and Ultra-Simple Transducer Structure

Photonics, 2022
Fiber-distributed optical fiber acoustic sensor (DAS) is generally used in distributed long-distance acoustic/vibration measurement. Recently, DAS is also used in weak airborne sound detection.
Jianfang Tang, Minghao Hu, Gan Jiang, Xuanyu Zheng, Fei Peng   +4 more
doaj   +1 more source

Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry

Sensors, 2021
A microwave photonics method has been developed for measuring distributed acoustic signals. This method uses microwave-modulated low coherence light as a probe to interrogate distributed in-fiber interferometers, which are used to measure acoustic ...
Liwei Hua, Xuran Zhu, Baokai Cheng, Yang Song, Qi Zhang, Yongji Wu, Lawrence C. Murdoch, Erin R. Dauson, Carly M. Donahue, Hai Xiao   +9 more
doaj   +1 more source

The cornerstone of fiber-optic distributed vibration/acoustic sensing: Ф-OTDR

Opto-Electronic Advances, 2023
Fiber-optic distributed vibration/acoustic sensing (DVS/DAS) technology achieves breakthrough performance and explores broad cornerstone industrial applications.
Yunjiang Rao
doaj   +1 more source

Distributed acoustic sensing recordings of low-frequency whale calls and ship noise offshore Central Oregon [PDF]

JASA Express Letters, 2023
Distributed acoustic sensing (DAS) is a technique that measures strain changes along an optical fiber to distances of ∼100 km with a spatial sensitivity of tens of meters.
William S. D. Wilcock, Shima Abadi, Bradley P. Lipovsky   +2 more
doaj   +1 more source