Geohazard Prevention and Pipeline Deformation Monitoring Using Distributed Optical Fiber Sensing

2013 ◽  
Author(s):  
Fabien Ravet ◽  
Carlos Borda ◽  
Etienne Rochat ◽  
Marc Niklès
Keyword(s):  
Soil Erosion ◽  
Design Guidelines ◽  
Deformation Monitoring ◽  
Lessons Learned ◽  
Temperature Sensing ◽  
Strain Sensing ◽  
Geotechnical Monitoring ◽  
Environmental Threat ◽  
Pipeline Monitoring ◽  
Distributed Optical Fiber

The present work introduces the technology background at the origin of FOPIMS (Fiber Optic Pipeline Integrity Monitoring Systems) with an emphasis on geotechnical monitoring. It shows how temperature sensing can be implemented to control soil erosion or dune migration through event localization and spatial quantification. Arctic pipeline monitoring project illustrates the application of soil erosion detection. Direct measurement of strain in soil also enhances environmental threat detection. Combined with temperature sensing, strain sensing composes the geotechnical monitoring system. Transandean pipeline monitoring examples are presented where the DITEST AIM was implemented for geohazard prevention. These study cases concern new pipeline installation as well as retrofit of existing lines. The technique successfully evidenced early events and allowed preventive measures to be taken. In some applications actual pipeline deformation need to be monitored. Such operation is achieved by measuring distributed strain along sensing cables attached to the structure. We show how such measurements complement the geotechnical measurements. We also describe a real implementation in seismic active area. As a whole, the work focuses on the technique principles, the installation and how the system is being implemented for pipeline preventive maintenance. We intend to present a comprehensive set of design guidelines based on real results and lessons learned from the various projects in what concerns geohazard detection and pipeline deformation monitoring.

Pipeline Monitoring With Geotechnical Optical Fiber

2017 ◽  
Author(s):  
Christian Silva ◽  
Fabien Ravet
Keyword(s):  
Optical Fiber ◽  
Fiber Optic ◽  
Large River ◽  
Temperature Sensing ◽  
Fiber Optic Cable ◽  
Right Of Way ◽  
Geotechnical Monitoring ◽  
Pipeline Monitoring ◽  
Operating Company ◽  
Abnormal Temperature

The 408 km × 34" PERULNG pipeline (operated by Hunt LNG Operating Company) is monitored in its first 62 km by a geotechnical fiber optic cable, since these first 62 km are exposed to major geohazard threats such as landslides, large river crossings, high slopes, bofedales, etc. The fiber optic cable geotechnical monitoring relies on the measurement of strain and temperature in the pipeline right-of-way. Due to the continuous and real-time monitoring of the duct, it was possible to detect a tension cracking near KP 25 + 600 as an abnormal temperature change was captured by the temperature sensing cable; also near KP 27 + 900 and KP 34 + 750 unusual cable stresses were detected which announced landslides of the rotational type in both locations. In these three cases, protection decisions could be taken to secure pipeline’s integrity.

Experimental Research of Distributed Optical Fiber Sensor Monitors the Embankment Hidden Hazard

2012 ◽  
Vol 226-228 ◽  
pp. 2132-2136 ◽  
Author(s):  
Hua Lei ◽  
Ping Yu Zhu ◽  
Hong Qiang Liang ◽  
Guo Qin Hou
Keyword(s):  
Optical Fiber ◽  
Optical Fiber Sensor ◽  
Deformation Monitoring ◽  
Fiber Sensor ◽  
Good Effect ◽  
Strain Identification ◽  
Strain Sensing ◽  
Long Distance ◽  
Distributed Optical Fiber Sensor ◽  
Distributed Optical Fiber

Distributed optical fiber sensor as the basis for temperature difference and strain identification, it has some advantages on deformation monitoring and seepage monitoring of the dams relying on long distance, continuous monitoring ability, distributed performance, strong anti-interference ability and other characteristics that traditional sensors do not have advantages. Taking layout of layered installation for example, this paper studies the relationship between laying bending radius and the strain sensing characteristics of the optical fiber sensor. The test of through the indoor simulated experiment and the outdoor dam model monitoring shows that the distributed optical fiber sensor for dam danger monitoring has good effect and promising applications. The dam model provides experimental platform to further study early warning criterion of dam hidden disaster.

Fully-physically crosslinked silk fibroin/poly(hydroxyethyl acrylamide) hydrogel with high transparency and adhesive properties for wireless sensing and low-temperature strain sensing

2021 ◽  
Vol 9 (6) ◽  
pp. 1880-1887
Author(s):  
Xia Sun ◽  
Shaoshuai He ◽  
Mengmeng Yao ◽  
Xiaojun Wu ◽  
Haitao Zhang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Silk Fibroin ◽  
Temperature Sensing ◽  
Wireless Sensing ◽  
Strain Sensitivity ◽  
Strain Sensing ◽  
Adhesive Properties ◽  
High Transparency ◽  
Physically Crosslinked ◽  
Temperature Strain

Fully-physically crosslinked hydrogels with strain sensitivity and anti-freezing properties for wireless sensing and low temperature sensing were prepared.

Functional Requirements for Effective Decision Making in Humanrobot Teams: Lessons Learned from Operational Settings

2005 ◽  
Vol 49 (3) ◽  
pp. 452-456
Author(s):  
James Tittle ◽  
William Elm ◽  
Scott Potter
Keyword(s):  
Decision Making ◽  
Information Seeking ◽  
Reference Frames ◽  
Broad Class ◽  
Design Guidelines ◽  
Lessons Learned ◽  
Point Of View ◽  
Functional Requirements ◽  
Urban Search And Rescue ◽  
Robot Teams

Many environments require humans and robots operating together to accomplish complex and dangerous tasks, but technology-centered designs often support robot navigation but not the mission goals of the organization using the robot. Urban Search and Rescue (USAR) is a particularly valuable domain to identify general functional requirements for effective HRI, and our purpose in this paper is to demonstrate how a CSE approach can lead to valuable design guidelines that more effectively support decision making within Human-Robot teams. Our analysis of HRI in USAR lead us to identify several important guidelines for supporting effective coordination for Human-Robot teams: including (i) enable individual problem holders to have direct control over point-of-view to facilitate active information seeking, and (ii) create common reference frames on shared imagery so different problem holders can remotely coordinate information and actions. Designs based on these guidelines will support a broad class of coordinated activities between team members.

CHARACTERIZING ANOMALIES IN DISTRIBUTED STRAIN MEASUREMENTS OF CAST-IN-SITU BORED PILES

2016 ◽  
Vol 78 (8-5) ◽  
Author(s):  
Hisham Mohamad ◽  
Bun Pin Tee ◽  
Koh An Ang ◽  
Mun Fai Chong
Keyword(s):  
Load Transfer ◽  
Load Test ◽  
Strain Sensing ◽  
Strain Profile ◽  
A New Technique ◽  
Optical Time ◽  
Distributed Optical Fiber ◽  
Non Destructive ◽  
Distributed Strain

This paper describes the method of identifying typical defects of bored cast-in-situ piles when instrumenting using Distributed Optical Fiber Strain Sensing (DOFSS). The DOFSS technology is based on Brillouin Optical Time Domain Analyses (BOTDA), which has the advantage of recording continuous strain profile as opposed to the conventional discrete based sensors such as Vibrating Wire strain gauges. In pile instrumentation particularly, obtaining distributed strain profile is important when analysing the load-transfer and shaft friction of a pile, as well as detecting any anomalies in the strain regime. Features such as defective pile shaft necking, discontinuity of concrete, intrusion of foreign matter and improper toe formation due to contamination of concrete at base with soil particles, among others, may cause the pile to fail. In this study, a new technique of detecting such defects is proposed using DOFSS technology which can potentially supplement the existing non-destructive test (NDT) methods. Discussion on the performance of instrumented piles by means of maintained load test are also presented

Fibre optic temperature sensing: A new tool for temperature measurements in boreholes

Geophysics ◽  
1996 ◽  
Vol 61 (4) ◽  
pp. 1065-1067 ◽  
Author(s):  
Stephan Großwig ◽  
Eckart Hurtig ◽  
Katrin Kühn
Keyword(s):  
Temperature Monitoring ◽  
Temperature Sensing ◽  
Temperature Measurements ◽  
New Approach ◽  
Temperature Probe ◽  
Stop And Go ◽  
First Results ◽  
Optical Fiber Sensing ◽  
Distributed Optical Fiber ◽  
Fiber Optic Temperature

Usually, the temperature in boreholes is determined using a standard temperature probe. The logging technique is either “stop and go”, or the probe is lowered as a moving probe into the borehole using a controlled speed. Distributed temperature probe arrays installed permanently in a borehole are an alternative to moving probes and can be applied especially for temperature monitoring even under conditions where moving probes cannot be used. The distributed optical fiber sensing technique represents a new approach for temperature measurements. The basis for this method is given in Boiarski (1993), Dakin et al. (1985), Farries and Rogers (1984), Hartog and Gamble (1991), Rogers (1988), Rogers (1993). First results using fiber optic temperature sensing in boreholes and temperature monitoring for studying geotechnical and environmental problems (e.g., waste deposits) are published in Hurtig et al. (1993; 1994; 1995) and Hurtig and Schrötter (1993).

scholarly journals Experimental Study on Deformation Monitoring of Bored Pile Based on BOTDR

2019 ◽  
Vol 9 (12) ◽  
pp. 2435 ◽  
Author(s):  
Lei Gao ◽  
Chuan Han ◽  
Zhongquan Xu ◽  
Yingjie Jin ◽  
Jianqiang Yan
Keyword(s):  
Optical Fiber ◽  
Noise Removal ◽  
Deformation Monitoring ◽  
Optical Time Domain Reflectometer ◽  
Fiber Sensing ◽  
Bored Pile ◽  
Sensing Technology ◽  
Optical Fiber Sensing ◽  
Unbiased Risk ◽  
Distributed Optical Fiber

In order to study the deformation of bored pile, it is necessary to monitor the strain of the pile. The distributed optical fiber sensing technology realizes the integration of sensing and transmission, which is incomparable with traditional point monitoring method. In this paper, the Brillouin optical time domain reflectometer (BOTDR) distributed optical fiber sensing technology is used to monitor the deformation of the bored pile. The raw data monitored by BOTDR is processed by the wavelet basis function, that can perform noise removal processing. Three different methods of noise removal are chosen. Through the processing, the db5 wavelet is used to decompose the deformation data of bored pile monitored by BOTDR into two layers. The decomposed high-frequency signal is denoised by the Stein-based unbiased risk threshold, rigrsure. The decomposed data is smoothed by the translational mean method, and the final data after denoising and smoothing processing is real and reliable. The results of this study will provide data support for the deformation characteristics of bored pile, and also show the advantages of distributed optical fiber sensing technology.

Advances in Brillouin-based distributed optical fiber temperature sensing

2005 ◽  
Author(s):  
Yongqian Li ◽  
Fucai Zhang ◽  
Yujun He ◽  
Zhi Yang ◽  
Toshihiko Yoshino
Keyword(s):  
Optical Fiber ◽  
Temperature Sensing ◽  
Distributed Optical Fiber
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