Multi-point location algorithm for distributed optical fiber disturbances detection system

2013 ◽  
Author(s):  
He Wang ◽  
Qizhen Sun ◽  
Xiaolei Li ◽  
Jianghai Wo ◽  
Deming Liu
Keyword(s):  
Optical Fiber ◽  
Detection System ◽  
Point Location ◽  
Location Algorithm ◽  
Distributed Optical Fiber

Detection Research on Weak Stress Wave in Rock-Soil Based on Quasi Distributed Optical Fiber Sensing Technology

2012 ◽  
Vol 542-543 ◽  
pp. 933-936
Author(s):  
Chong Feng Sun ◽  
Zhi Hui Li ◽  
Su Min Jiao ◽  
Xue Mei Wang ◽  
Cai Hong Wang ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Dynamic Loading ◽  
Detection System ◽  
Michelson Interferometer ◽  
Low Pressure ◽  
Optical Fiber Sensors ◽  
Stress Sensitivity ◽  
Fiber Sensors ◽  
Set Up ◽  
Distributed Optical Fiber

To detect low-pressure dynamic loading in rock-soil, optical fiber Michelson interferometer was adopted to set up the sensing system. Polyurethane package was used to enhance stress sensitivity of optical fiber sensors that composed quasi distributed optical fiber detection system. The sensitivity of optical fiber senor reached -170dB, and met the measurement requirement of low pressure dynamic loading at 0.001MPa-0.01MPa. The results proved that it was feasible to detect low-pressure dynamic loading using the designed optical fiber sensors. It provides a new experiment method for research on response of low-pressure dynamic loading in geotechnical engineering.

Low Misstatement Rate Distributed Optical Fiber Fence Intrusion Detection System by Variety of Wavelet Decomposition Method

2011 ◽  
Vol 40 (11) ◽  
pp. 1692-1696 ◽  
Author(s):  
吴庥伟 WU Xiuwei ◽  
吴慧娟 WU Huijuan ◽  
饶云江 RAO Yunjiang ◽  
吴宇 WU Yu ◽  
赵天 ZHAO Tian
Keyword(s):  
Intrusion Detection ◽  
Optical Fiber ◽  
Intrusion Detection System ◽  
Decomposition Method ◽  
Wavelet Decomposition ◽  
Detection System ◽  
Distributed Optical Fiber

Optimization of a distributed optical fiber sensor system based on phase sensitive OTDR for disturbance detection

Sensor Review ◽  
2015 ◽  
Vol 35 (4) ◽  
pp. 382-388 ◽  
Author(s):  
Yage Zhan ◽  
Qiao Yu ◽  
Kun Wang ◽  
Fu Yang ◽  
Borui Zhang
Keyword(s):  
Optical Fiber ◽  
Detection System ◽  
Optical Fiber Sensor ◽  
Fiber Sensor ◽  
Detection Capability ◽  
Content Type ◽  
Distributed Optical Fiber Sensor ◽  
Phase Sensitive ◽  
Distributed Optical Fiber ◽  
Disturbance Detection

Purpose – The purpose of this paper is to theoretically analyze and experimentally demonstrate the investigation on and optimization of a distributed optical fiber sensor based on phase-sensitive optical time domain reflectometer (F-OTDR) for disturbance detection. Design/methodology/approach – The F-OTDR system is investigated and optimized in two aspects: the hardware parameter and the interrogation scheme. Findings – Based on the optimized hardware and the new interrogation scheme, the performances of the F-OTDR system have been improved greatly, compared with conventional F-OTDR system. A location accuracy of 2 m and a signal-to-noise ratio (SNR) of 16 dB have been achieved under a spatial resolution of 8 m. On the other hand, four disturbances at four different locations have been detected and located simultaneously, which is the most effective detection system with the maximum detection capability reported to date, to the best of the authors’ knowledge. Originality/value – Four disturbances at four different locations have been detected and located simultaneously, which is the most effective detection system with the maximum detection capability reported to date, to the best of the authors’ knowledge. With same hardware conditions, more existing disturbances can be detected by using the new interrogation scheme, which is helpful to reduce the miss report of disturbance.

The Study of On-Line Fiber Optic Monitoring for Pressure Component

2013 ◽  
Vol 330 ◽  
pp. 460-464
Author(s):  
Biao Xiao ◽  
Jun Si ◽  
Xiao Ming Luo ◽  
H.T. Wang ◽  
F.Z. Xuan
Keyword(s):  
Optical Fiber ◽  
Detection System ◽  
Fiber Grating ◽  
Piping System ◽  
Monitoring Methods ◽  
Engineering Structures ◽  
Advantages And Disadvantages ◽  
On Line ◽  
Implementation Method ◽  
Distributed Optical Fiber

The application of the distributed optical-fiber detection system and optical fiber grating detection system in the laboratory piping system leakage platform, was analyzed in this paper. Based on the on-line monitoring tests, the potential advantages and disadvantages of optical-fiber method using for engineering structures were summarized. The implementation method on the optical-fiber monitoring methods for pressure vessel and industrial piping system in service was proposed in the end.

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