Load and Damage Monitoring of Intelligent Structures Based on Optical Fibers

In this paper we study on a novel method to distinguish the loading location on structures based on optical fiber network. The principle of detection and monitoring system is illustrated in the paper and the experiments of loading position judgment are conducted. The experimental data and curves meet preferably to the analysis of theory. The results obtained are encouraging offering the possibilities of employing this novel method of loading position judgment in intelligent composite structures. The system of monitoring and analysis is approved to be real-time, effective and reliable and the research in this paper offers a new way of application of the special optical intelligent structure.

Download Full-text

Damage detection in laminar thermoplastic composite materials by means of embedded optical fibers

Hemijska industrija ◽

10.2298/hemind0608176k ◽

2006 ◽

Vol 60 (7-8) ◽

pp. 176-179

Author(s):

Aleksandar Kojovic ◽

Irena Zivkovic ◽

Ljiljana Brajovic ◽

Dragan Mitrakovic ◽

Radoslav Aleksic

Keyword(s):

Composite Materials ◽

Optical Fiber ◽

Real Time ◽

Optical Fibers ◽

Impact Damage ◽

Experimental Testing ◽

Low Energy ◽

Thermoplastic Composite ◽

Woven Fabric ◽

The Impact

This paper investigates the possibility of applying optical fibers as sensors for investigating low energy impact damage in laminar thermoplastic composite materials, in real time. Impact toughness testing by a Charpy impact pendulum with different loads was conducted in order to determine the method for comparative measurement of the resulting damage in the material. For that purpose intensity-based optical fibers were built in to specimens of composite materials with Kevlar 129 (the DuPont registered trade-mark for poly(p-phenylene terephthalamide)) woven fabric as reinforcement and thermoplastic PVB (poly(vinyl butyral)) as the matrix. In some specimens part of the layers of Kevlar was replaced with metal mesh (50% or 33% of the layers). Experimental testing was conducted in order to observe and analyze the response of the material under multiple low-energy impacts. Light from the light-emitting diode (LED) was launched to the embedded optical fiber and was propagated to the phototransistor-based photo detector. During each impact, the signal level, which is proportional to the light intensity in the optical fiber, drops and then slowly recovers. The obtained signals were analyzed to determine the appropriate method for real time damage monitoring. The major part of the damage occurs during impact. The damage reflects as a local, temporary release of strain in the optical fiber and an increase of the signal level. The obtained results show that intensity-based optical fibers could be used for measuring the damage in laminar thermoplastic composite materials. The acquired optical fiber signals depend on the type of material, but the same set of rules (relatively different, depending on the type of material) could be specified. Using real time measurement of the signal during impact and appropriate analysis enables quantitative evaluation of the impact damage in the material. Existing methods in most cases use just the intensity of the signal before and after the impact, as the measure of damage. This method could be used to monitor the damage in real time, giving warnings before fatal damage occurs.

Download Full-text

A real-time network monitoring system of urban infrastructure facilities utilized for optical fiber aimed at general management system

10.1117/12.620587 ◽

2005 ◽

Author(s):

Masahiro Nakano ◽

Masatomi Okuno ◽

Susumu Sasaki ◽

Shigehiro Shimodaira

Keyword(s):

Optical Fiber ◽

Real Time ◽

Monitoring System ◽

Management System ◽

Network Monitoring ◽

Urban Infrastructure ◽

General Management

Download Full-text

Application of Optical Fiber Sensing Real-Time Monitoring Technology Using in Ripley Landslide

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.610.199 ◽

2014 ◽

Vol 610 ◽

pp. 199-204 ◽

Cited By ~ 1

Author(s):

Xiao Fei Zhang ◽

Zhong Hu Lv ◽

Xian Wei Meng ◽

Fan Jiang ◽

Qing Zhang

Keyword(s):

Optical Fiber ◽

Real Time ◽

Monitoring System ◽

Landslide Monitoring ◽

Real Time Monitoring ◽

The Real ◽

Fiber Sensing ◽

Sensing Technology ◽

Database Technology ◽

Optical Fiber Sensing

Nowadays, fiber optic technology has been used in sensing. Using the distributed optical fiber sensing technology in the landslide monitoring, the linear strain distribution information of the whole landslide can be obtained, and adopting the Fiber Bragg Grating sensing technology in the landslide monitoring, the key pot strain and displacement information can be gained. This paper firstly reviews the basic principle of optical fiber sensing, and then describes the optical fiber sensing real-time monitoring system by combining with FBG technology, BOTDR technology, database technology and web server technology, and finally presents a field application experiment using the real-time monitoring system in Ripley landslide in Canada. The experiment indicated that the real-time monitoring system can be realized real-time monitoring of FBG and BOTDR for landslide, and the experience can be extended to other landslide.

Download Full-text

A prototype real-time dose distribution monitoring system using plastic scintillators connected to optical fiber for interventional radiology

2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS/MIC) ◽

10.1109/nssmic.2013.6829657 ◽

2013 ◽

Keyword(s):

Interventional Radiology ◽

Optical Fiber ◽

Real Time ◽

Monitoring System ◽

Dose Distribution ◽

Plastic Scintillators ◽

Time Dose

Download Full-text

Long-Range Distributed Solar Irradiance Sensing Using Optical Fibers

Sensors ◽

10.3390/s20030908 ◽

2020 ◽

Vol 20 (3) ◽

pp. 908 ◽

Cited By ~ 1

Author(s):

Regina Magalhães ◽

Luis Costa ◽

Sonia Martin-Lopez ◽

Miguel Gonzalez-Herraez ◽

Alejandro F. Braña ◽

...

Keyword(s):

Solar Energy ◽

Optical Fiber ◽

Real Time ◽

Long Range ◽

Optical Fibers ◽

Solar Irradiance ◽

High Sensitivity ◽

Ground Level ◽

Solar Simulator ◽

Distributed Sensor

Until recently, the amount of solar irradiance reaching the Earth surface was considered to be a steady value over the years. However, there is increasing observational evidence showing that this quantity undergoes substantial variations over time, which need to be addressed in different scenarios ranging from climate change to solar energy applications. With the growing interest in developing solar energy technology with enhanced efficiency and optimized management, the monitoring of solar irradiance at the ground level is now considered to be a fundamental input in the pursuit of that goal. Here, we propose the first fiber-based distributed sensor able of monitoring ground solar irradiance in real time, with meter scale spatial resolutions over distances of several tens of kilometers (up to 100 km). The technique is based on an optical fiber reflectometry technique (CP-ϕOTDR), which enables real time and long-range high-sensitivity bolometric measurements of solar radiance with a single optical fiber cable and a single interrogator unit. The method is explained and analyzed theoretically. A validation of the method is proposed using a solar simulator irradiating standard optical fibers, where we demonstrate the ability to detect and quantify solar irradiance with less than a 0.1 W/m2 resolution.

Download Full-text

Study on Oil and Gas Pipeline Leakage Real-Time Inspection System Based on Distributed Optical Fiber

2008 7th International Pipeline Conference, Volume 1 ◽

10.1115/ipc2008-64011 ◽

2008 ◽

Author(s):

Hao Feng ◽

Shijiu Jin ◽

Yan Zhou ◽

Zhoumo Zeng ◽

Pengchao Chen

Keyword(s):

Optical Fiber ◽

Real Time ◽

Optical Fibers ◽

Oil And Gas ◽

New Technology ◽

Inspection System ◽

System Construction ◽

Fiber System ◽

Distributed Optical Fiber ◽

The Cost

A distributed optical fiber system used to detect pipeline leakage and lawless excavation is put forward in this paper. This system is based on Mach-Zehnder optical fiber interferometer theory, which uses three monomode fibers in one optical fiber cable to compose two Mach-Zehnder interferometers. Vibrations from leakage point and lawless excavation along the pipeline can be acquired by the optical fibers, so the vibrations occurred on the pipeline can be detected in real time. In this paper, the principle and the system construction are introduced, and the way of the fiber cable to influence the sensitivity is studied. And also, the polarization on the optical path is studied in this paper, and a new technology to eliminate “Polarization Debilitating” is put forward. With principle analysis and experimental results, it is demonstrated that the detection system’s measuring sensitivity and location accuracy for detecting leakage and lawless excavation are greatly improved when adopting this technology, and furthermore the cost is very low.

Download Full-text

Study on Oil and Gas Pipeline Leakage Real-Time Inspection System Based on Distributed Optical Fiber

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.381-382.447 ◽

2008 ◽

Vol 381-382 ◽

pp. 447-450 ◽

Cited By ~ 2

Author(s):

Y. Zhou ◽

Shi Jiu Jin ◽

H. Feng ◽

Z.M. Zeng ◽

Z.G. Qu

Keyword(s):

Optical Fiber ◽

Real Time ◽

Optical Fibers ◽

Oil And Gas ◽

Single Mode ◽

Vibration Sensor ◽

Inspection System ◽

System Construction ◽

Detection Technology ◽

Distributed Optical Fiber

A new distributed optical fiber pipeline leakage detection technology based on Mach-Zehnder optical fiber interferometer theory is put forward. When using this technology, an optical fiber cable is laid along the pipeline. Noise from leaking point on the pipeline can be acquired by the optical fiber vibration sensor which was composed of three single mode optical fibers, thus, leakage occurred on the pipeline can be detected in real time. The detection principle and system construction are explained and in-site testing data is analyzed. With principle analysis and experimental results, it is demonstrated that the detection system’s measuring sensitivity and location accuracy for detecting leakage are high when adopting this technology.

Download Full-text

Backbone Optical Fiber Analysis at 1310 nm and 1550 nm

Journal of Optical Communications ◽

10.1515/joc-2018-0042 ◽

2018 ◽

Vol 0 (0) ◽

Author(s):

Nandhakumar P ◽

Arun Kumar

Keyword(s):

Optical Fiber ◽

Real Time ◽

Optical Fibers ◽

Single Mode ◽

Optical Fiber Communication ◽

Long Distance ◽

Fiber Communication ◽

The Real ◽

Optical Time Domain Reflectometer ◽

Optic Communication

AbstractOptical fiber communication is the backbone of the entire telecommunication industries in the world. In this work, the real-time backbone long-distance optical fibers (single mode) are tested and analyzed with two different wavelengths (1,310 nm and 1,550 nm) with the help of optical time domain reflectometer. Using these two different wavelengths, how the losses and events of the backbone optical fibers are changing are compared and analyzed. This work will give a way to study the nature of long-distance backbone optical fiber and understand the real-time application of the fiber optic communication.

Download Full-text