scholarly journals Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing System

2019 ◽  
Author(s):  
Romain Zinsou ◽  
Xin Liu ◽  
Yu Wang ◽  
Jianguo Zhang ◽  
Yuncai Wang ◽  
...  
Keyword(s):  
Recent Progress ◽  
Performance Enhancement ◽  
Signal To Noise Ratio ◽  
Vibration Sensor ◽  
Sensor System ◽  
Sensing System ◽  
Vibration Sensing ◽  
Signal Demodulation ◽  
Phase Signal ◽  
Phase Sensitive

Recently, the phase-sensitive OTDR (Φ-OTDR) based vibration sensor system has gained the focus of many researchers and some efforts have been undertaken to push further the limitations imposed on the performance of the Φ-OTDR sensor system. Then, progress in the different areas of its performance evaluation factors such as: improvement of the signal-to-noise ratio (SNR), spatial resolution (SR) in the sub-meter range, enlargement of the sensing range, frequency response bandwidth over the conventional limit and phase signal demodulation for quantitative measurement have been realized. This paper presents an overview of the recent progress in the Φ-OTDR based vibration sensing system in the different areas mentioned above.

scholarly journals Recent Progress in the Performance Enhancement of Phase-Sensitive OTDR Vibration Sensing Systems

Sensors ◽  
2019 ◽  
Vol 19 (7) ◽  
pp. 1709 ◽  
Author(s):  
Romain Zinsou ◽  
Xin Liu ◽  
Yu Wang ◽  
Jianguo Zhang ◽  
Yuncai Wang ◽  
...  
Keyword(s):  
Recent Progress ◽  
Performance Enhancement ◽  
Signal To Noise Ratio ◽  
Time Domain Reflectometry ◽  
Vibration Sensor ◽  
Sensor Systems ◽  
Sensing Systems ◽  
Vibration Sensing ◽  
Signal Demodulation ◽  
Phase Sensitive

Recently, phase-sensitive Optical Time-Domain Reflectometry (Φ-OTDR)-based vibration sensor systems have gained the interest of many researchers and some efforts have been undertaken to push the performance limitations of Φ-OTDR sensor systems. Thus, progress in different areas of their performance evaluation factors such as improvement of the signal-to-noise ratio (SNR), spatial resolution (SR) in the sub-meter range, enlargement of the sensing range, increased frequency response bandwidth over the conventional limits, phase signal demodulation and chirped-pulse Φ-OTDR for quantitative measurement have been realized. This paper presents an overview of the recent progress in Φ-OTDR-based vibration sensing systems in the different areas mentioned above.

Research on FBG Vibration Sensing Technology

2013 ◽  
Vol 391 ◽  
pp. 340-343
Author(s):  
Zhi Yang ◽  
Wei Liu ◽  
Ting An
Keyword(s):  
Fiber Bragg Grating ◽  
High Performance ◽  
Vibration Sensor ◽  
Fiber Grating ◽  
Key Technology ◽  
Sensing System ◽  
Vibration Detection ◽  
Sensing Technology ◽  
Vibration Sensing ◽  
Signal Demodulation

With the progress of fiber grating sensing technology, FBG gradually become high-performance vibration sensor and has been widely used in vibration detection. Vibration sensing signal demodulation is the key technology for fiber Bragg grating sensing system. This paper details several fiber grating vibration sensor demodulation techniques and gives experiment result.

scholarly journals Performance Optimization for Phase-Sensitive OTDR Sensing System Based on Multi-Spatial Resolution Analysis

Sensors ◽  
2018 ◽  
Vol 19 (1) ◽  
pp. 83 ◽  
Author(s):  
Yuanyuan Shan ◽  
Wenbin Ji ◽  
Qing Wang ◽  
Lu Cao ◽  
Feng Wang ◽  
...  
Keyword(s):  
Spatial Resolution ◽  
Performance Optimization ◽  
Signal To Noise Ratio ◽  
Time Domain Reflectometry ◽  
Sensing System ◽  
Optical Time Domain Reflectometry ◽  
Resolution Analysis ◽  
Phase Sensitive ◽  
Optical Time ◽  
Qualitative Relationship

This paper proposes and demonstrates a phase-sensitive optical time domain reflectometry (Φ-OTDR) sensing system with multi-spatial resolution (MSR) analysis property. With both theoretical analysis and an experiment, the qualitative relationship between spatial resolution (SR), signal-to-noise ratio (SNR) and the length of the vibration region has been revealed, which indicates that choosing a suitable SR to analyze the vibration event can effectively enhance the SNR of a sensing system. The proposed MSR sensing scheme offers a promising solution for the performance optimization of Φ-OTDR sensing systems, which can restore vibration events of different disturbance range with optimum SNR in merely a single measurement while maintaining the same detectable frequency range.

scholarly journals Performance Enhancement Methods for the Distributed Acoustic Sensors Based on Frequency Division Multiplexing

Electronics ◽  
2019 ◽  
Vol 8 (6) ◽  
pp. 617 ◽  
Author(s):  
Yanzhu Hu ◽  
Zhen Meng ◽  
Mohammadmasoud Zabihi ◽  
Yuanyuan Shan ◽  
Siyi Fu ◽  
...  
Keyword(s):  
Performance Enhancement ◽  
Signal To Noise Ratio ◽  
Dead Zone ◽  
High Sensitivity ◽  
Time Domain Reflectometry ◽  
System Structure ◽  
Frequency Division Multiplexing ◽  
Frequency Division ◽  
Rayleigh Backscattering ◽  
Sensing System

The last years have witnessed the wide application of Distributed Acoustic Sensor (DAS) systems in several fields, such as submarine cable monitoring, seismic wave detection, structural health monitoring, etc. Due to their distributed measurement ability and high sensitivity, DAS systems can be employed as a promising tool for the phase sensitive optical time domain reflectometry (Φ-OTDR). However, it is also well-known that the traditional Φ-OTDR system suffers from Rayleigh backscattering (RBS) fading effects, which induce dead zones in the measurement results. Worse still, in practice it is difficult to achieve the optimum matching between spatial resolution (SR) and signal to noise ratio (SNR). Further, the overall frequency response range (FRR) of the traditional Φ-OTDR is commonly limited by the length of the fiber in order to prevent RBS signals from overlapping with each other. Additionally, it is usually difficult to reconstruct high frequency vibration signals accurately for long range monitoring. Aiming at solving these problems, we introduce frequency division multiplexing (FDM) that makes it easier to improve the system performance with less system structure changes. We propose several novel Φ-OTDR schemes based on Frequency Division Multiplexing (FDM) technology to solve the above problems. Experimental results showed that the distortion induced by fading effects could be suppressed to 1.26%; when the SR of Φ-OTDR is consistent with the length of the vibration region, the SNR of the sensing system is improved by 3 dB compared to the average SNR with different SRs; vibration frequencies up to 440 kHz have been detected along 330 m artificial microstructures. Thus, the proposed sensing system offers a promising solution for the performance enhancement of DAS systems that could achieve high SNR, broadband FRR and dead zone-free measurements at the same time.

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 Fiber Optic Based Distributed Mechanical Vibration Sensing

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4779
Author(s):  
Vít Novotný ◽  
Petr Sysel ◽  
Aleš Prokeš ◽  
Pavel Hanák ◽  
Karel Slavíček ◽  
...  
Keyword(s):  
Mechanical Vibration ◽  
Single Mode ◽  
Time Domain Reflectometry ◽  
Sensing System ◽  
Optical Time Domain Reflectometry ◽  
Measurement Results ◽  
Vibration Sensing ◽  
Phase Sensitive ◽  
Optical Time ◽  
Initial Measurement

The distributed long-range sensing system, using the standard telecommunication single-mode optical fiber for the distributed sensing of mechanical vibrations, is described. Various events generating vibrations, such as a walking or running person, moving car, train, and many other vibration sources, can be detected, localized, and classified. The sensor is based on phase-sensitive optical time-domain reflectometry (ϕ-OTDR). Related sensing system components were designed and constructed, and the system was tested both in the laboratory and in the real deployment, with an 88 km telecom optical link, and the results are presented in this paper. A two-fiber sensor unit, with a double-sensing range was also designed, and its scheme is described. The unit was constructed and the initial measurement results are presented.

Distributed Strain and Vibration Sensing System Based on Phase-Sensitive OTDR

2015 ◽  
Vol 27 (17) ◽  
pp. 1884-1887 ◽  
Author(s):  
Ling Zhou ◽  
Feng Wang ◽  
X.iangchuan Wang ◽  
Yun Pan ◽  
Zhenqin Sun ◽  
...  
Keyword(s):  
Sensing System ◽  
Vibration Sensing ◽  
Phase Sensitive ◽  
Distributed Strain

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.

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