Leakage detection and location analysis of tap water pipe based on distributed optical fiber temperature measurement

2018 ◽  
Author(s):  
ya zhao ◽  
qiang wang ◽  
zhangwei ling
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Tap Water ◽  
Location Analysis ◽  
Leakage Detection ◽  
Water Pipe ◽  
Distributed Optical Fiber

A review of previous studies on dam leakage based on distributed optical fiber thermal monitoring technology

Sensor Review ◽  
2021 ◽  
Vol 41 (4) ◽  
pp. 350-360
Author(s):  
Xiao Fang ◽  
Yajie Zeng ◽  
Feng Xiong ◽  
Jiang Chen ◽  
Fei Cheng
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Monitoring System ◽  
Temperature Data ◽  
Thermal Monitoring ◽  
Monitoring Technology ◽  
Content Type ◽  
Fiber Sensing ◽  
Optical Fiber Sensing ◽  
Distributed Optical Fiber

Purpose Seepage of the dam is an important safety problem, which may cause internal erosion of the structure. In the field of seepage monitoring in civil engineering, the distributed optical fiber sensing technology based on the temperature tracing method has been paid more attention due to its unique advantages of high sensitivity, good stability and high resolution. The purpose of this paper is to make a review of the existing related research, so as to facilitate the later scholars to understand and further study more systematically. Design/methodology/approach In this paper, three kinds of commonly used distributed fiber temperature measurement technologies are introduced. Based on the working principle, monitoring system, theoretical analysis, experimental research and engineering application of the fiber seepage monitoring technology, the present situation of dam seepage monitoring based on distributed fiber is reviewed in detail and their advantages and disadvantages are compared. Findings The thermal monitoring technology of seepage measurement depends on the accuracy of optical fiber temperature measurement (including the accuracy of the system and the rationality of the discrimination method), the correct installation of optical fiber and the quantitative analysis of temperature data. The accuracy of the current monitoring system can basically meet the existing measurement requirements, but the correct installation of optical fiber and the calibration of temperature data need to be further studied for different discrimination methods, and this field has great research value. Originality/value At present, there are many applications and research studies of optical fiber sensing in the field of structural health monitoring, and there are also reviews of related aspects. However, there is little or no review only in the field of seepage monitoring. This paper summarizes the research and application of optical fiber sensing in the field of seepage monitoring. The possibility of the gradient method to find its new prospect with the development of monitoring systems and the improvement of temperature resolution is discussed. The idea of extending the seepage monitoring method based on distributed optical fiber thermal monitoring technology to other monitoring fields is also given in the paper.

scholarly journals Experimental Study of Leakage Monitoring of Diaphragm Walls Based on Distributed Optical Fiber Temperature Measurement Technology

Sensors ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 2269 ◽  
Author(s):  
Tao Liu ◽  
Wenjing Sun ◽  
Hailei Kou ◽  
Zhongnian Yang ◽  
Qingsheng Meng ◽  
...  
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Heating Power ◽  
Measurement Technology ◽  
Seepage Velocity ◽  
Stable Temperature ◽  
Heating Cable ◽  
Diaphragm Walls ◽  
Leakage Monitoring ◽  
Distributed Optical Fiber

In geotechnical engineering seepage of diaphragm walls is an important issue which may cause engineering disasters. It is therefore of great significance to develop reliable monitoring technology to monitor the leakage. The purpose of this study is to explore the application of a distributed optical fiber temperature measurement system in leakage monitoring of underground diaphragm walls using 1 g model tests. The principles of seepage monitoring based on distributed optical fiber temperature measurement technology are introduced. Fiber with heating cable was laid along the wall to control seepage flow at different speeds. The temperature rise of the fiber during seepage was also recorded under different heating power conditions. In particular the effect of single variables (seepage velocity and heating power) on the temperature rise of optical fibers was discussed. Test results indicated that the temperature difference between the seepage and non-seepage parts of diaphragm wall can be monitored well using fiber-optic external heating cable. Higher heating power also can improve the resolution of fiber-optic seepage. The seepage velocity had a linear relationship with the final stable temperature after heating, and the linear correlation coefficient increases with the increase of heating power. The stable temperature decreased with the increase of flow velocity. The findings provide a basis for quantitative measurement and precise location of seepage velocity of diaphragm walls.

Research for Thermal Drift of APD Gain in Distributed Temperature Sensing System Based on the Raman Back-Scattering

2012 ◽  
Vol 571 ◽  
pp. 716-720
Author(s):  
Lei Sang ◽  
Jie Zhang ◽  
Xin Qun Wang
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Bias Voltage ◽  
Laser Pulses ◽  
Distributed Temperature Sensing ◽  
Temperature Bias ◽  
Back Scattering ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber ◽  
Anti Stokes

In the temperature measurement system of distributed optical fiber based on Raman back-scattering, the temperature measurement depends on a series of laser pulses in the optical fiber, which produces anti-stokes and stokes lights of Raman back-scattering at various points. By using the ratio of them, the measurement of temperature field space can be realized. But the signals that can be gained are quite weak in practice, and there are interferences of noises and external signals, therefore APD is selected (Avalance Photodiode) to amplify the weak signals. Because the gain characteristics of APD are vulnerable to the influences of temperature and bias voltage, so in this paper the experiments were carried on about the effects of temperature, bias voltage, incident power etc. on APD, and a substantive discussion was discussed.

Numerical and experimental study on leakage detection for buried gas pipelines based on distributed optical fiber acoustic wave

2021 ◽  
Vol 32 (12) ◽  
pp. 125209
Author(s):  
Jia Zhang ◽  
Zhanghua Lian ◽  
Zhaoming Zhou ◽  
Jian Zhang ◽  
Ming Xiong ◽  
...  
Keyword(s):  
Experimental Study ◽  
Acoustic Wave ◽  
Optical Fiber ◽  
Leakage Detection ◽  
Gas Pipelines ◽  
Distributed Optical Fiber

Research on Novel Distributed Optical Fiber Pipeline Leakage Detection Technology and Location Method

2008 ◽  
Vol 28 (1) ◽  
pp. 123-127 ◽  
Author(s):  
杭利军 Hang Lijun ◽  
何存富 He Cunfu ◽  
吴斌 Wu Bin ◽  
蔡栋生 Cai Dongsheng ◽  
宋晏蓉 Song Yanrong
Keyword(s):  
Optical Fiber ◽  
Leakage Detection ◽  
Location Method ◽  
Detection Technology ◽  
Distributed Optical Fiber

Distributed Optical Fiber Raman Temperature Measurement System Based on the Dynamic Multi-section Temperature Calibration

2011 ◽  
Vol 40 (9) ◽  
pp. 1297-1302
Author(s):  
金钟燮 JIN Zhong-xie ◽  
崔海军 CUI Hai-jun ◽  
宁枫 NING Feng ◽  
李小琴 LI Xiao-qin ◽  
朱永 ZHU Yong
Keyword(s):  
Optical Fiber ◽  
Temperature Measurement ◽  
Measurement System ◽  
Temperature Calibration ◽  
Temperature Measurement System ◽  
Distributed Optical Fiber
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