Sensitivity of high Rayleigh scattering fiber in acoustic/vibration sensing using phase-OTDR

2018 ◽  
Author(s):  
Oleg V. Butov ◽  
Yuri K. Chamorovskii ◽  
Konstantin M. Golant ◽  
Andrei A. Fotiadi ◽  
Johan Jason ◽  
...  
Keyword(s):  
Rayleigh Scattering ◽  
Acoustic Vibration ◽  
Vibration Sensing

scholarly journals Optical Fibres for Condition Monitoring of Railway Infrastructure—Encouraging Data Source or Errant Effort?

2020 ◽  
Vol 10 (17) ◽  
pp. 6016 ◽  
Author(s):  
Ivan Vidovic ◽  
Stefan Marschnig
Keyword(s):  
Rayleigh Scattering ◽  
Acoustic Vibration ◽  
Optical Fibres ◽  
Maintenance Planning ◽  
Root Cause ◽  
Railway Tracks ◽  
Railway Infrastructure ◽  
Vibration Sensing ◽  
Data Source ◽  
Asset Data

The condition of railway infrastructure is currently assessed by track recording cars, wayside equipment, onboard monitoring techniques and visual inspections. These data sources deliver valuable information for infrastructure managers on the asset’s condition but are mostly carried out in time-based intervals. This paper examines the potential of fibre optic cables, which are already installed in cable troughs alongside railway tracks, to monitor railway infrastructure conditions. The sensing technique, known as distributed acoustic/vibration sensing (DAS/DVS), relies on the effect of Rayleigh scattering and transforms the optical fibre into an array of “virtual microphones” in the thousands. This sensing method has the ability to be used over long distances and thus provide information about the events taking place in the proximity of the monitored asset in real-time. This study outlines the potential of DAS for the identification of different track conditions and isolated track defects. The results are linked to asset data of the infrastructure manager to identify the root cause of the detected signal anomalies and pattern. A methodology such as this allows for condition-based and component-specific maintenance planning and execution and avoids the installation of additional sensors. DAS can pave the way toward a permanent and holistic assessment of railway tracks.

Noise Analysis of φ-OTDR Vibration Sensing System

2014 ◽  
Vol 687-691 ◽  
pp. 459-462
Author(s):  
Li Ma ◽  
Yong Qian Li
Keyword(s):  
Rayleigh Scattering ◽  
Noise Analysis ◽  
Vibration Sensor ◽  
Noise Amplitude ◽  
Matlab Simulation ◽  
High Noise ◽  
Sensing System ◽  
Effective Suppression ◽  
Vibration Sensing ◽  
Suppression Method

The interference principle of backscattering light in the optical fiber is analyzed theoretically and the sensing mechanism of φ-OTDR vibration sensor system is introduced briefly in this paper. The trace of backward Rayleigh scattering is obtained by MATLAB simulation, and it is compared to the scattering curve by experiment. The result shows that noise is inevitable in the experiment, and the desired signal is difficult to be detected for the high noise amplitude. For obtaining high SNR in the experiment, the compositions and causes of the noise is introduced and the effective suppression method are put forward.

scholarly journals Cost-effective solution for phase-OTDR distributed acoustic/vibration sensing

2019 ◽  
Author(s):  
Vasily V. Spirin ◽  
Cesar A. López-Mercado ◽  
Johan Jason ◽  
José L. Bueno-Escobedo ◽  
Patrice Mégret ◽  
...  
Keyword(s):  
Cost Effective ◽  
Acoustic Vibration ◽  
Effective Solution ◽  
Vibration Sensing

scholarly journals Vibration Sensor Based on Hollow Biconical Fiber

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1023
Author(s):  
Yingfang Zhang ◽  
Ben Xu ◽  
Dongning Wang ◽  
Yun Guo ◽  
Min Chen ◽  
...  
Keyword(s):  
Transmission Loss ◽  
Signal To Noise Ratio ◽  
Sound Intensity ◽  
Single Mode ◽  
Acoustic Vibration ◽  
Single Mode Fiber ◽  
Vibration Sensor ◽  
Acoustic Frequency ◽  
Compact Size ◽  
Vibration Sensing

A hollow biconical fiber is proposed and experimentally demonstrated for vibration sensing. It is fabricated by creating an air micro-cavity in single-mode fiber, followed by tapering it. Experimental results show that the device is highly sensitive to bending with a sensitivity of 21.30 dB/m−1. When it is exposed to vibration, its transmission loss is modulated periodically, then based on the measured transmission, the vibration frequency can be demodulated accurately. The acoustic vibration testing results show that the proposed device can detect and demodulate the exciting acoustic frequency accurately and distinguish its sound intensity, and the maximum signal to noise ratio (SNR) achieves up to 59 dB. Moreover, cantilever beam testing proves its performance reliable. Additionally, the sensing head has the advantages of a lightweight, compact size (with a total length of less than 250 μm), and insensitivity of temperature. All these features indicate the proposed sensor has a promising potential in the engineering field.

Research of Optical Fiber Fabry-Perot Acoustic Vibration Sensing Demodulation System Based on Dual Tunable Lasers

2016 ◽  
Vol 53 (4) ◽  
pp. 042801
Author(s):  
樊茁 Fan Zhuo ◽  
王双 Wang Shuang ◽  
刘铁根 Liu Tiegen ◽  
刘琨 Liu Kun ◽  
何盼 He Pan ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Acoustic Vibration ◽  
Tunable Lasers ◽  
Fabry Perot ◽  
Vibration Sensing

Double Cladding Fiber for Acoustic Vibration Sensing

2018 ◽  
Author(s):  
Guanghui Sui ◽  
Huanhuan Liu ◽  
Fufei Pang ◽  
Jiajing Cheng ◽  
Tingyun Wang
Keyword(s):  
Acoustic Vibration ◽  
Vibration Sensing

RAYLEIGH SCATTERING OF MÖSSBAUER RADIATION ON VAPOUR-QUENCHED Te

1979 ◽  
Vol 40 (C2) ◽  
pp. C2-140-C2-141 ◽  
Author(s):  
F. M. Wagner ◽  
F. J. Litterst ◽  
G. M. Kalvius
Keyword(s):  
Rayleigh Scattering
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