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Fiber Bragg Gratings

Fiber Bragg Gratings
A Book

by Raman Kashyap

  • Publisher : Academic Press
  • Release : 2009-10-23
  • Pages : 632
  • ISBN : 9780080919911
  • Language : En, Es, Fr & De
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Provides an overview of Fiber Bragg Gratings (FBGs), from fundamentals to applications Evaluates the advantages and disadvantages of particular applications, methods and techniques Contains new chapters on sensing, femtosecond laser writing of FBGs and poling of glass and optical fibers Includes a special version of the photonic simulator PicWave(tm), allowing the reader to make live simulations of many of the example devices presented in the book. This fully revised, updated and expanded second edition covers the substantial advances in the manufacture and use of FBGs in the years since the publication of the pioneering first edition. It presents a comprehensive treatise on FBGs and addresses issues such as the merits of one solution over another; why particular fabrication methods are preferred; and what advantages a user may gain from certain techniques. Beginning with the principles of FBGs, the book progresses to discuss photosensitization of optical fibers, Bragg grating fabrication and theory, properties of gratings, specific applications, sensing technology, glass poling, advances in femtosecond laser writing of Bragg gratings and FBG measurement techniques. In addition to material on telecommunications usage of FBGs, application areas such as fiber lasers and sensors are addressed in greater detail. This special version of Picwave is limited to modelling only the passive fibre devices covered in this book. However the full PicWave package is capable of modelling other non-linear and active devices such as laser diodes and SOAs as discussed in Chapter 8. More information about PicWave can be found at www.photond.com/products/picwave.htm. In addition to researchers, scientists, and graduate students, this book will be of interest to industrial practitioners in the field of fabrication of fiber optic materials and devices. Raman Kashyap, Canada Research Chair holder on Future Photonics Systems, and Professor at École Polytechnique, University of Montréal since 2003, has researched optical fibers and devices for over 30 years. He pioneered the fabrication of FBGs and applications in telecommunications and photonics. Provides an overview of Fiber Bragg Gratings (FBGs), from fundamentals to applications Evaluates the advantages and disadvantages of particular applications, methods and techniques Contains new chapters on sensing, femtosecond laser writing of FBGs and poling of glass and optical fibers Includes a special version of the photonic simulator PicWave(tm), allowing the reader to make live simulations of many of the example devices presented in the book

Fiber Bragg Gratings

Fiber Bragg Gratings
Fundamentals and Applications in Telecommunications and Sensing

by Andreas Othonos,Kyriacos Kalli

  • Publisher : Artech House Optoelectronics L
  • Release : 1999
  • Pages : 422
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Fiber Bragg gratings are flexible, cost-effective and highly efficient, with a vast range of potential applications. This timely new work provides a comprehensive description of the principles and practical applications of this latest technology, which has the potential to revolutionize telecommunications and significantly impact optical fiber sensing. Here the authors explain the underlying physics and practical aspects in a clear and unambiguous manner.

Polymer Optical Fiber Bragg Gratings

Polymer Optical Fiber Bragg Gratings
Fabrication and Sensing Applications

by Ricardo Oliveira,Lucia Maria Botas Bilro,Rogerio Nunes Nogueira

  • Publisher : CRC Press
  • Release : 2019-11-12
  • Pages : 226
  • ISBN : 1000733661
  • Language : En, Es, Fr & De
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Polymer optical fibers (POFs) have been regarded as a viable alternative to silica fibers in a variety of sensing applications. Fiber optic sensors offer key advantages over other sensing technologies, which include immunity to electromagnetic interference, compact, lightweight, multiplexing capability, and higher sensitivity. This book gives an overview of the polymer optical fiber Bragg grating (POFBG) technology over the last 20 years, covering aspects related to the fiber Bragg grating fabrication and also sensing applications. The book is split into five chapters, and it is written in such a way that can provide a comprehensive and simple route to new users, scientists and engineers working or wishing to work in the field of POFBGs: Describes the systems commonly employed for producing fiber Braggs gratings (FBGs) in silica fibers that can be used for the production of POFBGs; Explores different laser sources for the inscription of POFBGs; Explores the capability of using this technology at the visible and infrared region, in different fiber types (e.g., step-index, microstructured, unclad, highly birefringent) and in fibers composed of different polymer materials such as PMMA, doped PMMA, PS and ZEONEX; Reports the fabrication of different types of POF gratings, such as uniform, phase-shifted, tilted, chirped, and long-period gratings; Shows the opportunities of POFBGs for a variety of sensing applications. The insight to the use of POFBGs provides a vision for the opportunities of this fiber optic technology.

Full Matlab Code for Synthesis and Optimization of Bragg Gratings

Full Matlab Code for Synthesis and Optimization of Bragg Gratings
A Book

by Fethallah Karim

  • Publisher : Cambridge Scholars Publishing
  • Release : 2018-11-07
  • Pages : 578
  • ISBN : 1527521192
  • Language : En, Es, Fr & De
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This book presents a theoretical description of fiber Bragg gratings, focusing on channels’ densification and the tunability of Bragg filters. It also includes a full Matlab code for the synthesis and optimization of several kinds of fiber Bragg gratings by using the directed tabu search, the simulated annealing method and the genetic algorithm. Physical and optical parameters of uniform, chirped and sampled fiber Bragg gratings are then reconstructed with these algorithms.

Fiber Bragg Gratings: Channels'densification and Tunability

Fiber Bragg Gratings: Channels'densification and Tunability
A Book

by Fethallah Karim

  • Publisher : LAP Lambert Academic Publishing
  • Release : 2014-03
  • Pages : 68
  • ISBN : 9783659220432
  • Language : En, Es, Fr & De
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This book gives an overview of Fiber Bragg gratings and specially on sampled gratings which are used in WDM transmission links. In this document, several methods for channel's densification are presented. We focus also on channel's tunability by applying strain and temperature effects. Finally, multiplexeurs and demultiplexers based on uniform Bragg gratings are presented and analyzed at the end of this manuscript.

Tunable Fiber Bragg Grating Using Evanescent Field Coupling

Tunable Fiber Bragg Grating Using Evanescent Field Coupling
A Book

by Jae-yoon Jeong

  • Publisher : Unknown Publisher
  • Release : 2001
  • Pages : 264
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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In this work, we present experimental results on tenability of fiber Bragg grating incorporating evanescent field coupling. Evanescent field is the exponentially decaying part of an optical mode formed in a waveguide. A section of fiber with a Bragg grating written in it is side-polished until most of the cladding is removed. The evanescent field is modified by applying different index matching oil and by placing a dielectric material on the polished area of the fiber. A tunability as much as 5 nm was demonstrated as the applied index matching oil varied from n = 1.40 to n = 1.45. Polarization dependent behavior of the device was also measured and it was found out that the polarization component that is perpendicular to the polished surface experiences severe loss. A prototype tunable grating device incorporating a MEMS structure is also discussed.

Fiber Bragg Gratings

Fiber Bragg Gratings
Theory, Fabrication, and Applications

by Marcelo Martins Werneck,Regina Célia da Silva Barros Allil,Fábio Vieira Batista de Nazaré

  • Publisher : SPIE-International Society for Optical Engineering
  • Release : 2017
  • Pages : 242
  • ISBN : 9781510613850
  • Language : En, Es, Fr & De
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"This Tutorial Text delivers essential information concerning fiber Bragg gratings to professionals and researchers with an approach based on rules of thumb and practical aspects, enabling quick access to the main principles and techniques, and allowing readers to set up their own laboratory or application. It provides detailed information about how to operate and use these novel sensors, particularly with respect to the required infrastructure, daily operation, and possible applications. After a discussion of the primary concepts, practical aspects regarding the development of a FBG laboratory and how these components are manufactured and used in practical applications are presented. The following chapters outline the operation of Bragg gratings and, for instance, discuss how measurement information can be retrieved (interrogation techniques), calibration methods, and how to prepare and deploy the devices in real monitoring conditions. The final chapters present several successful, real-world applications of the technology"--

Comparison of Resistance-based Strain Gauges and Fiber Bragg Gratings in the Presence of Electromagnetic Interference Emitted from an Electric Motor

Comparison of Resistance-based Strain Gauges and Fiber Bragg Gratings in the Presence of Electromagnetic Interference Emitted from an Electric Motor
A Book

by Douglas Keller (jr.)

  • Publisher : Unknown Publisher
  • Release : 2018
  • Pages : 102
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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This thesis reports a performance analysis of resistance based strain gauges and fiber optic fiber Bragg gratings in an environment contaminated by high levels of electromagnetic interference. The obtained results are directly applicable to the development of aerospace vehicles propelled by electrical motors. An area of importance in this relatively new technology is characterizing the mechanical loadings coming off a propulsion device in a stationary setup. This characterization is usually accomplished through the utilization of load cells. The majority of the load cells used in such an application are based on measurements acquired through resistance strain gauges. However, electric motors are known to radiate electromagnetic interference (EMI), which in the case of brushless DC motors is pulsing, alternating, square waves. This EMI severely degrades the signal produced by the resistance strain gauge. This degradation is due to the gauge's metallic construction, acting as an antenna for the EMI. To evaluate the performance of alternative strain measuring methods, a load cell implementing both the resistance strain gauge and fiber Bragg grating sensor, the latter of which is immune to EMI, was designed as a test article. The load cell was calibrated and demonstrated a thrust load sensitivity of 1.93 ±0.04 lbf through the strain gauge system and 0.56 ±0.56 lbf through the fiber Bragg grating system. The device was subjected to both mechanical loading and EMI to quantify the effect of the EMI on the resistance strain gauge. Testing of the device included operating a brushless DC motor, with a coupled flywheel, attached to the load cell at a range of angular velocities from 500 to 2400 RPM. During laboratory testing the resistance strain gauge signal exhibited an important amount of signal spikes and electrical noise, introduced by the EMI contamination; the fiber Bragg grating did not. The spikes increased linearly with the speed of the motor. The electrical noise required bandpass filtering to extract the mechanical signal, which was obtained without noise in the fiber Bragg grating signal. The resistance strain gauge signal, at a maximum, had a signal to noise ratio of 0.0443; the fiber Bragg grating signal, at a minimum, had a signal to noise ratio of 2.0114. These results demonstrated the fiber Bragg grating is more applicable in an EMI contaminated environment.

Fibre Bragg Gratings in Harsh and Space Environments

Fibre Bragg Gratings in Harsh and Space Environments
Principles and Applications

by Brahim Aïssa,Emile I. Haddad,Wes R. Jamroz,Roman V. Kruzelecky

  • Publisher : Materials, Circuits and Device
  • Release : 2019-07-16
  • Pages : 232
  • ISBN : 9781785619809
  • Language : En, Es, Fr & De
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This book addresses the critical challenge of developing Fibre Bragg Gratings (FBGs) for applications as sensors in harsh and space environment. Coverage ranges from the basic principles through design, fabrication, and testing to their industrial implementation.

Developing a Fiber Optic Magnetic Field Sensor: Fiber Bragg Gratings and the Magnetorefractive Effect

Developing a Fiber Optic Magnetic Field Sensor: Fiber Bragg Gratings and the Magnetorefractive Effect
A Book

by Scott Strutner Strutner

  • Publisher : Unknown Publisher
  • Release : 2016
  • Pages : 216
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Optical fiber Bragg gratings (FBGs) have been shown to provide sensing of strain and temperature at 100's of points along a fiber's path. This work extended that to 1000's of points, and added discrete sensing of magnetic field along the fiber. The first was achieved via an extension of the optical frequency domain reflectometery (OFDR) de-multiplexing method. This was done by treating FBG segments as a series of concatenated FBGs instead of one discrete FBG. Such treatment allows for the resolution of even a micro-crack's strain fields in a pressurized composite overwrapped pressure vessel (COPV), which are on the 0.5 mm scale. The second advancement of FBGs, magnetic sensing, was added via an assembly to transduce magnetic attraction into fiber strain. This assembly allowed multiplexed magnetically sensitive FBG sensors for the first time. Stringing pieces of magnetic material onto a fiber and gluing that fiber onto a structure is an easy method and largely uses off-the-shelf components. This will prove simple to expand and utilize to solve actual engineering problems. To further improve, by removing the strain transduction and thus reduce vibrational sensitivity, a new magneto-optical material is needed. An investigation into the magnetorefractive effect (MRE), and characterization of the shift of index of refraction in the material La1-xSrxMnO3 (LSMO) with magnetic field and temperature was performed. The index of refraction of the LSMO was found to shift with magnetic field. This was leveraged to create a magnetometer interferometer. That device did not function though, as the absorption of the magneto-optic LSMO used prevented light's transmission through that active material. This highlights the complex, i.e. non-real, index of refraction of LSMO an aspect which would warrant further investigation.

Multimode Optical Fiber Bragg Gratings

Multimode Optical Fiber Bragg Gratings
Modeling, Simulation and Experiments

by Jinsong Zhang

  • Publisher : Unknown Publisher
  • Release : 2004
  • Pages : 328
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Optical Fiber Sensor Technology

Optical Fiber Sensor Technology
Advanced Applications - Bragg Gratings and Distributed Sensors

by K. T. V. Grattan,L.S. Grattan,B. T. Meggitt

  • Publisher : Springer Science & Business Media
  • Release : 2000-09-30
  • Pages : 385
  • ISBN : 9780792379461
  • Language : En, Es, Fr & De
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Optical Fiber Sensor Technology, Advanced Applications - Bragg Gratings and Distributed Sensors, builds upon the foundations of the subject in the preceding four volumes of this series, concentrating as they do upon both applications and the technology of advanced optical fiber sensors. Previous volumes have covered the fundamentals of the field, devices and systems and chemical and environmental monitoring. This volume deals with a range of highly topical sensor devices and commercial systems, with considerable emphasis upon one of the most important areas, Bragg gratings in fibers, their fabrication and applications in advanced sensor systems and the principles and use of distributed fiber optic sensors. The volume is well illustrated and referenced, pointing to hundreds of key publications accessible in the open literature. It draws upon a group of authors with an international reputation for their work in the area, carefully edited into a coherent and logical text by the editors, based on their considerable experience in the field. This book series will provide an invaluable source for researchers, engineers and advanced students in the field of optical fibers, optoelectronics and measurement and sensing.

Fiber Bragg Grating

Fiber Bragg Grating
Bimetal Temperature Sensor for Solar Panel Inverters

by Mohd Afiq Ismail

  • Publisher : Unknown Publisher
  • Release : 2011
  • Pages : 140
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The Fabrication of Multiple Fiber Bragg Gratings on a Single Mode Fiber Using One Phase-mask

The Fabrication of Multiple Fiber Bragg Gratings on a Single Mode Fiber Using One Phase-mask
A Thesis ...

by Nigel Sayers

  • Publisher : Unknown Publisher
  • Release : 2003
  • Pages : 322
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Simulations of Step-like Bragg Gratings in Silica Fibers Using COMSOL

Simulations of Step-like Bragg Gratings in Silica Fibers Using COMSOL
A Book

by Rasika Dahanayake

  • Publisher : Unknown Publisher
  • Release : 2016
  • Pages : 87
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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The purpose of the research was to build a model for simulations of Fiber Bragg Grating (FBG) sensors under harsh conditions. In this thesis we were studying the 2D model of a fiber under different wavelength EM radiation (530 nm, 1310 nm, and 1530 nm), also we introduced a novel 3D model of FBG. The 3D model of the FBG is used to study the modes of the fiber under varying grating period (1310 nm, 908.62 nm, and 454.31 nm) and with varying number of slabs in the grating (10, 50, and 100). The novelty of this work is an introduction of step-like profile in FBGs. Potentially, this approach may be used for experimental high temperature sensing under harsh conditions.

Dispersion Compensation Using Fiber Bragg Gratings

Dispersion Compensation Using Fiber Bragg Gratings
A Book

by Salil Karkarey

  • Publisher : Unknown Publisher
  • Release : 2010
  • Pages : 134
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Current Trends in Short- and Long-period Fiber Gratings

Current Trends in Short- and Long-period Fiber Gratings
A Book

by Christian Cuadrado-Laborde

  • Publisher : BoD – Books on Demand
  • Release : 2013-05-15
  • Pages : 196
  • ISBN : 9535111310
  • Language : En, Es, Fr & De
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In this book the reader will find a collection of chapters written by different experts around the world, describing the current research trends in both short- and long-period fiber grating technology. This work is mainly addressed to researchers already working in this area, but it is also accessible to anyone with a scientific background who desires to have an updated overview of the recent progress in this domain. It will also be valuable to scientist and engineers who have become newly involved in this field. Each chapter is self-contained and can be read independently of the others. This book intends to provide highlights of the current research in this area, showing the recent advances in the field of fiber gratings.

Damage Prognosis with Embedded Fiber Bragg Gratings

Damage Prognosis with Embedded Fiber Bragg Gratings
A Book

by Jordan Ye

  • Publisher : Unknown Publisher
  • Release : 2019
  • Pages : 116
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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This paper aims to use structural health monitoring (SHM) on fiberglass reinforced plastic (FRP) panels subject to fatigue loading. The testing procedure will assess the structural integrity and predict the remaining serviceability of a panel. Fiber optic sensors embedded into the specimens collect readings after discrete fatigue cycle damage level increments which are then transformed into multidimensional damage sensitive features. The features are then placed in a mahalanobis distance space where they are examined under a positive feedback relationship. Constraints on the model, linearize the method, and finally, a data driven approach produces probabilistic time of failure predictions at each damage phase.

Development of Highly Sensitive Fiber Bragg Grating-based Sensor for Measuring Patellar Tendon Bar Pressure

Development of Highly Sensitive Fiber Bragg Grating-based Sensor for Measuring Patellar Tendon Bar Pressure
A Book

by Ebrahim Ali Ahmed Al-Fakih

  • Publisher : Unknown Publisher
  • Release : 2011
  • Pages : 178
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Temperature Sensing of Micron Scale Polymer Fibers Using Fiber Bragg Gratings

Temperature Sensing of Micron Scale Polymer Fibers Using Fiber Bragg Gratings
A Book

by Anonim

  • Publisher : Unknown Publisher
  • Release : 2015
  • Pages : 329
  • ISBN : 9876543210XXX
  • Language : En, Es, Fr & De
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Abstract: Highly conductive polymer fibers are key components in the design of multifunctional textiles. Measuring the voltage/temperature relationships of these fibers is very challenging due to their very small diameters, making it impossible to rely on classical temperature sensing techniques. These fibers are also so fragile that they cannot withstand any perturbation from external measurement systems. We propose here, a non-contact temperature measurement technique based on fiber Bragg gratings (FBGs). The heat exchange is carefully controlled between the probed fibers and the sensing FBG by promoting radiation and convective heat transfer rather than conduction, which is known to be poorly controlled. We demonstrate our technique on a highly conductive Poly(3, 4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS)-based fiber. A non-phenomenological model of the sensing system based on meaningful physical parameters is validated towards experimental observations. The technique reliably measures the temperature of the polymer fibers when subjected to electrical loading.