Download or read book Novel Methods for Interrogation of Fiber Bragg Gratings and Their Applications for Developing New Optical Sensors written by Shay Keren and published by . This book was released on 2003 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Fiber Bragg Gratings written by Marcelo Martins Werneck and published by SPIE-International Society for Optical Engineering. This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A history of FBG device development -- Fiber Bragg grating theory and models -- How to set up a fiber Bragg grating laboratory -- Inscribing fiber Bragg gratings in optical fibers -- Calibrating fiber Bragg gratings for temperature and strain -- Encapsulation and bonding -- Compensation of induced thermal effects -- Structural health monitoring with fiber Bragg gratings -- Temperature measurements -- Measurement of the coefficient of thermal expansion of materials / Leandro Alves Garção and Marceli Nunes Gonçalves -- Measuring strain and displacement -- Voltage measurement / Marceli Nunes Gonçalves -- Interrogation techniques of fiber Bragg gratings -- Current measurements -- Gas measurements / Bruno Cerqueira Rente Ribeiro.
Download or read book Analysis and Modelling of a Novel Approach for the Interrogation Unit of Fiber Bragg Grating Sensors Using Optical Frequency Domain Reflectometry Techniques written by Deniz Pala and published by . This book was released on 2014 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main purpose of this thesis is to demonstrate the feasibility of using polarization properties of FBGs interrogated by OFDR for quasi-distributed sensing applications. A fiber Bragg grating (FBG) is a constant and periodic refractive index value modulation within the core along an optical fiber. This modification is generally obtained by exposing the fiber core of a photosensitive optical fiber to an intense ultraviolet (UV) interference pattern. At the fabrication process of Bragg gratings, only one side of the fiber expose to UV light. As a result, refractive index change is not constant at the cross section of fiber. This non-uniformity on the refractive index gives rise to photo-induced birefringence which combines with the birefringence resulting from the slightly elliptical shape of the optical fiber and creates a global birefringence value. In the presence of the birefringence, the reflection (transmission) spectrum of Bragg grating is degenerated into two reflection (transmission) spectra corresponding to a pair of orthogonal polarization modes (x and y modes). The ratio between maximum and minimum optical transmitted power of these modes are defined as Polarization Dependent Loss (PDL). We analyzed the reflection spectrum, transmission spectrum and the PDL of the cascaded FBGs interrogated by an OFDR by the way of simulations. Based on the simulation results, we demonstrated the feasibility of a novel FBG interrogation method which can be implemented in quasi-distributed strain sensors embedded into composite materials.
Download or read book Fiber Bragg Gratings written by Raman Kashyap and published by Academic Press. This book was released on 2009-10-23 with total page 634 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Fiber Bragg Gratings written by Marcelo Martins Werneck and published by SPIE-International Society for Optical Engineering. This book was released on 2017 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt: "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"--
Download or read book Fiber Bragg Grating Sensors Development and Applications written by Hisham K. Hisham and published by CRC Press. This book was released on 2019-06-19 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the basic principles of optical sensor technology in line with the tremendous development in the concept of optical fibers. In the first four chapters, the book discusses the basic principles of optical sensor technology in a simplified manner, making it suitable for all levels of study and research. The seven remaining chapters are concerned with the practical applications of optical sensor technology in all fields such as oil and gas, civil engineering, medical and military fields and harsh environments.
Download or read book Fiber Bragg Grating Based Sensors and Systems written by Oleg Morozov and published by MDPI. This book was released on 2021-08-18 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is a collection of papers that originated as a Special Issue, focused on some recent advances related to fiber Bragg grating-based sensors and systems. Conventionally, this book can be divided into three parts: intelligent systems, new types of sensors, and original interrogators. The intelligent systems presented include evaluation of strain transition properties between cast-in FBGs and cast aluminum during uniaxial straining, multi-point strain measurements on a containment vessel, damage detection methods based on long-gauge FBG for highway bridges, evaluation of a coupled sequential approach for rotorcraft landing simulation, wearable hand modules and real-time tracking algorithms for measuring finger joint angles of different hand sizes, and glaze icing detection of 110 kV composite insulators. New types of sensors are reflected in multi-addressed fiber Bragg structures for microwave–photonic sensor systems, its applications in load-sensing wheel hub bearings, and more complex influence in problems of generation of vortex optical beams based on chiral fiber-optic periodic structures. Original interrogators include research in optical designs with curved detectors for FBG interrogation monitors; demonstration of a filterless, multi-point, and temperature-independent FBG dynamical demodulator using pulse-width modulation; and dual wavelength differential detection of FBG sensors with a pulsed DFB laser.
Download or read book Optical Fiber Sensor Technology written by L.S. Grattan and published by Springer Science & Business Media. This book was released on 1997-12-31 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: Progress in optical fiber sensors The field of optical fiber sensor technology is one that continues to expand and develop at a rate that could barely have been predicted a few years ago. The wealth of publications appearing in the technical literature and the burgeoning number of papers presented at the now well-established series of national and international conferences, which are attended by a wide selection of technically qualified optoelectronics professionals, gives a clear indication of both the range and scale of the devices and applications now seen in the subject. Such a rapid expansion makes it very difficult for the scientist and engineer, under pressure to be both informed and effective for an employer, to attend all these meetings, selectively read the appropriate literature and be able quickly to gain the knowledge in those specific areas which will give the best advantage for the work in hand. To that end, this volume has been planned and carefully designed to provide an essential overview, and detailed specific information, on those novel and exciting aspects of optical fiber sensor technology that have recently emerged, with particular focus on the devices and the exciting applications of this part of optoelectronic technology in the vast international measurement and instrumentation area.
Download or read book Fiber Bragg Grating Sensors Recent Advancements Industrial Applications and Market Exploitation written by Andrea Cusano and published by Bentham Science Publishers. This book was released on 2011 with total page 331 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is an exciting source of information for individuals interested in learning about and marketing sensors. The book focuses on scientific and commercial advances in Fiber Bragg Grating (FBG) sensor technology since its discovery over 30 years ago.
Download or read book Current Trends in Short and Long period Fiber Gratings written by Christian Cuadrado-Laborde and published by BoD – Books on Demand. This book was released on 2013-05-15 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Polymer Optical Fiber Bragg Gratings written by Ricardo Oliveira and published by CRC Press. This book was released on 2019-11-12 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Sensors and Their Applications XII written by S. J. Prosser and published by CRC Press. This book was released on 2003-09-01 with total page 657 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sensors and Their Applications XII discusses novel research in the areas of sensors and transducers and provides insight into new and topical applications of this technology. It covers the underlying physics, fabrication technologies, and commercial applications of sensors. Some of the topics discussed include optical sensing, sensing materials, no
Download or read book Fiber Bragg Grating Interrogation Systems written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis work deals with the development of three different categories of interrogation techniques for Fiber Bragg Grating based sensor networks. Such networks are used for structural health monitoring and other applications. A bulk grating based interrogation system is described first, which includes an optical source, switch, circulator, embedded controller, and software. The center wavelength determination technique employed is detailed and is shown to be highly accurate from test data. The comparison with resistance strain gauges is presented which shows that the system developed provides an accurate strain reconstruction. The system is also compared with a commercial optical spectrum analyzer and is found to exhibit good accuracy and fidelity. The system has been field tested on an aircraft structure with 14 sensors spread over 4 channels. Strain data reconstruction from these tests is shown to accurately reproduce the loading conditions. A second system developed is based on the matched filter technique using a mechanical fiber stretcher; the details of this system are presented with a mathematical treatment of the technique. The design of the fiber stretcher is also described. This design is regarded to be novel since it tries to provide large interrogation bandwidths using a parallel topology. The results of tests have shown good resolution and comparative tests with resistance strain gauges have shown accurate reproduction of strain. Finally, an interrogation system based on a wavelength tunable source is presented. This system is a precursor to a time division multiplexed interrogation system, which has also been described. Three laser configurations have been set up and characterized. The laser sweep tests have been performed on two configurations and a sensor grating reconstruction test has also been carried out.
Download or read book Springer Handbook of Experimental Solid Mechanics written by William N. Sharpe, Jr. and published by Springer Science & Business Media. This book was released on 2008-12-04 with total page 1100 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Springer Handbook of Experimental Solid Mechanics documents both the traditional techniques as well as the new methods for experimental studies of materials, components, and structures. The emergence of new materials and new disciplines, together with the escalating use of on- and off-line computers for rapid data processing and the combined use of experimental and numerical techniques have greatly expanded the capabilities of experimental mechanics. New exciting topics are included on biological materials, MEMS and NEMS, nanoindentation, digital photomechanics, photoacoustic characterization, and atomic force microscopy in experimental solid mechanics. Presenting complete instructions to various areas of experimental solid mechanics, guidance to detailed expositions in important references, and a description of state-of-the-art applications in important technical areas, this thoroughly revised and updated edition is an excellent reference to a widespread academic, industrial, and professional engineering audience.
Download or read book Fiber Bragg Grating Sensors written by Oleg G Morozov and published by . This book was released on 2024-07-16 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This reprint aims to explore one of the most popular trends of relevance to sensors, which represents an influential platform for the exchange of scientific knowledge in the field of FBGs from the point of view of its recent advances and future perspectives. We are opening small, but very interesting pages in FBGs' 35-year history. The first section is devoted to the modernization of FBG basics and its performance in various conditions: line-by-line inscription of tilted FBGs, radiation effects on FBGs, and short-term creep effect on strain transfer from fiber-reinforced polymer strips. The second one details new approaches to interrogation methods: a detailed algorithm of FBG spectrum distortion correction for classical OSA with CCD elements and noise analysis of new microwave photonic interrogation of fiber-based sensors. The next section reflects the results of using FBGs in aviation systems: noise cancellation of helicopter blade deformations, design of a high-precision shape sensor for wing shape reconstruction, and development of a medium-frequency accelerometer based on flexible hinges. We separately discuss the transfer of FBG technologies to new devices based on integral photonics and new mediums in which FBGs can gain new life: modeling a fully integrated micro-ring-based photonic system for liquid refractometry and designing wavelength-tunable vortex beam emitters based on silicon micro-rings and twisted few-mode optical fibers with improved height of quasi-step refractive index profiles.
Download or read book Development of Fiber Bragg Grating Strain Thermal and Magnetic Sensors for Smart Structure Applications written by Michael Christian Emmons and published by . This book was released on 2012 with total page 448 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optical fiber Bragg gratings offer great potential for sensing pertinent phenomena in a wide range of applications. Such range is demonstrated in this dissertation with the utilization of fiber Bragg gratings (FBGs) in two different fields of research. Both of these fields are encompassed by an overarching goal of developing smart structures capable of providing necessary feedback to enhance performance and safety. FBGs are employed in the field of structural health monitoring by measuring strain and detecting damage when embedded within AS4/3501-6 quasi-isotropic composites. The grating sensors are also utilized in the field of ferroic materials to explore novel methods of coupling external phenomena to the optical fiber reflection signal. The desire to create smart structures is carried out by developing the Bragg grating measurements system created by NASA Dryden Flight Research Center. This development involves studying the validity of strain measurements provided by embedded Bragg gratings and expanding the capabilities of the measurement system by coupling the sensors to additional types of external phenomena such as magnetic fields. Theoretical and experimental work is carried out for both phases of the dissertation. In the strain sensing phase, photoelasticity, electromagnetic wave propagation, and coupled mode theory are applied to understand the theoretical behavior of FBGs. Mechanical loads are applied to composite specimens with embedded FBGs to monitor the response of the reflection signal. Finite element analysis is then performed to further clarify how the load is transferred from the host composite to the embedded fiber. In the thermal and magnetic sensing phase, a description is given for the fabrication and experimental results of coating FBGs with thin film ferroic materials. Next, a more extensive electromagnetic wave propagation theory is described in the context of manipulating various fiber characteristics for magnetic field coupling. A FBG magnetometer is then fabricated and a magneto-optic coupling is demonstrated experimentally with an externally applied magnetic field.
Download or read book Fiber Bragg Gratings written by Evangelos Vasilios Diatzikis and published by . This book was released on 1998 with total page 244 pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: Bragg gratings were written into the core of an optical fiber using a phase mask and a continuous wave ultraviolet laser. The gratings exhibited a temperature induced shift in the Bragg wavelength. Fiber samples were exposed to hydrogen loading which resulted in enhanced photosensitivity of the fiber core, shorter writing times, and higher reflecting gratings. Phase shifted Bragg gratings were fabricated by utilizing the spatial modes of the ultraviolet laser during writing. A demodulation technique for fiber Bragg grating sensors is presented. It is based on the generation of an electrical carrier by using a modulated multimode laser diode to illuminate the fiber grating. The change in Bragg wavelength is measured by tracking the phase of the carrier at the detector output in either an open or a closed loop scheme. Experimental data was obtained for both strain and temperature measurements. The system showed a strong immunity to optical power fluctuations. The application of this demodulation scheme to a multiplexed sensing system is also demonstrated.
