Distributed vibration sensing of perimeter security based on space difference of Rayleigh backscattering

Ying, 尚盈 Shang; Chen, 王晨 Wang; Chang, 王昌 Wang; Xiaohui, 刘小会 Liu; Zhihui, 孙志慧 Sun; Jiasheng, 倪家升 Ni; Peng, Gang-Ding

doi:10.3788/irla201847.0522001

Cited by 4 publications

(2 citation statements)

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“…The working of DAS monitoring can be described as follows: a laser is used to send short light pulses down a single-mode optic fiber, part of which is backscattered due to local density fluctuations in the fiber [13] . Because of the light intensity of Fresnel reflection is 10 4 times higher than that of Rayleigh scattering [14] , the effective acoustic signal is covered.…”

Section: Optical Fiber End Anti-interference Technologymentioning

confidence: 99%

Research and application of distributed fiber optic monitoring technology in oil-water two-phase flow production profile testing

He,

Wu,

Zhu

et al. 2023

AOPC 2023: Optic Fiber Gyro

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Traditional production logging techniques are greatly affected by intermittent liquid production in low flow rate and unstable production situations. And the commonly used turbine structure testing instruments are impracticable in complex conditions such as small diameter casings and wellbore fluids. In response to those challenges, a new optical fiber testing system combines traditional instruments with distributed optical fibers was developed. The system integrated fiber and power cores into an optical-electrical composite logging cable and features a sealed connector to achieve high-pressure insulation and separation of the optical and power units in the cable. Moreover, Technique to mitigate the effects of Fresnel reflection was used at the end of small-diameter optical fibers. The signal loss or distortion zone caused by the reflection was reduced to 3m. In addition, a testing process for optical and electrical integration system in casing tubing annulus was developed, allowing for simultaneous traditional logging and optical data acquisition in a single trip into the well. The new integrated logging technique has been applied; the accuracy of the optical fiber depth correction is less than 1.5m by using magnetic positioning curve to ensure accurate depth. Low-frequency Distributed fiber Acoustic Sensing (DAS) data was used to evaluate production profile of the well. The results from optic fiber were validate via traditional production logging data, indicating that fiber optic monitoring technology is feasible for evaluating production profiles of low-yield oil and water wells.

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Section: Optical Fiber End Anti-interference Technologymentioning

confidence: 99%

Research and application of distributed fiber optic monitoring technology in oil-water two-phase flow production profile testing

He,

Wu,

Zhu

et al. 2023

AOPC 2023: Optic Fiber Gyro

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show abstract

“…It offers high sensitivity and does not have blind spots, as every point along the fiber is a sensitive unit. DAS has been widely applied in various fields such as perimeter security [1], pipeline monitoring [2][3], and railway safety monitoring [4][5]. Therefore, the application of distributed optical fiber sensing technology in the monitoring of operational safety in subway tunnels has become a new research hotspot.…”

Section: Introductionmentioning

confidence: 99%

Application and Research of Distributed Acoustic Sensing in Vibration Monitoring of Subway Tunnels

Gao,

Wang,

Yang

et al. 2024

J. Phys.: Conf. Ser.

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With the booming development of the rail transit industry and the increase in the construction and operation of mileage, the health status of infrastructure such as vehicles, tracks, and trains, as well as operational safety, have received widespread attention. Distributed optical fiber sensing technology has the characteristics of long monitoring distance, strong real-time performance, and highly economical, and has broad prospects in rail transit applications. This paper adopts Distributed Acoustic Sensing technology to obtain vibration information along the subway tunnel, analyzes the time-domain signal and frequency-domain energy characteristics of train vibration, as well as the passing time, direction, and location of the train, providing technical support for the safe operation of the subway.

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Discussion on the sensitivity of optical cables based on distributed acoustic sensing

Shang

Wang

et al. 2019

Opt Rev

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Distributed vibration sensing of perimeter security based on space difference of Rayleigh backscattering

Cited by 4 publications

References 0 publications

Research and application of distributed fiber optic monitoring technology in oil-water two-phase flow production profile testing

Research and application of distributed fiber optic monitoring technology in oil-water two-phase flow production profile testing

Application and Research of Distributed Acoustic Sensing in Vibration Monitoring of Subway Tunnels

Discussion on the sensitivity of optical cables based on distributed acoustic sensing

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