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

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.

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

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 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

scholarly journals Tunable characteristics of low-frequency bandgaps in two-dimensional multivibrator phononic crystal plates under prestrain

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hai-Fei Zhu ◽  
Xiao-Wei Sun ◽  
Ting Song ◽  
Xiao-Dong Wen ◽  
Xi-Xuan Liu ◽  
...  
Keyword(s):  
Phononic Crystal ◽  
Real Life ◽  
Low Frequency ◽  
Acoustic Vibration ◽  
Crystal Plate ◽  
Frequency Noise ◽  
Two Dimensional ◽  
The Matrix ◽  
Noise Frequency ◽  
Realtime Control

AbstractIn view of the influence of variability of low-frequency noise frequency on noise prevention in real life, we present a novel two-dimensional tunable phononic crystal plate which is consisted of lead columns deposited in a silicone rubber plate with periodic holes and calculate its bandgap characteristics by finite element method. The low-frequency bandgap mechanism of the designed model is discussed simultaneously. Accordingly, the influence of geometric parameters of the phononic crystal plate on the bandgap characteristics is analyzed and the bandgap adjustability under prestretch strain is further studied. Results show that the new designed phononic crystal plate has lower bandgap starting frequency and wider bandwidth than the traditional single-sided structure, which is due to the coupling between the resonance mode of the scatterer and the long traveling wave in the matrix with the introduction of periodic holes. Applying prestretch strain to the matrix can realize active realtime control of low-frequency bandgap under slight deformation and broaden the low-frequency bandgap, which can be explained as the multiple bands tend to be flattened due to the localization degree of unit cell vibration increases with the rise of prestrain. The presented structure improves the realtime adjustability of sound isolation and vibration reduction frequency for phononic crystal in complex acoustic vibration environments.

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