Performance Evaluation of Fiber Bragg Grating Temperature Sensor

Performance Evaluation of Fiber Bragg Grating Temperature Sensor

Author: Taha Ali Alian

Publisher: LAP Lambert Academic Publishing

Published: 2014-08-11

Total Pages: 108

ISBN-13: 9783659585906

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In this work, different FBG temperature sensors are simulated and evaluated with various apodization profiles. A New apodization function is proposed with a remarkable performance compared even with the Gaussian profile. Also, and for the first time, we introduce the Nuttall apodization profile with detailed analysis. Evaluation is done under a wide range of controlling design parameters like sensor length and refractive index modulation amplitude, targeting a remarkable temperature sensing performance. New judgment techniques are introduced such as apodization window roll-off rate, asymptotic sidelobe decay level, number of sidelobes, average sidelobe level and channel isolation. Evaluation techniques like reflectivity, Full Width at Half Maximum (FWHM), and Sidelobe Suppression Ratio are also used. A study is performed on including an unapodized sensor among apodized sensors in a quasi-distributed sensing system. The obtained results demonstrated the importance of investigating the previous controlling parameters and consequently the precise control on the FBG temperature sensor various characteristics to get the optimum sensor performance according to the application needs.


Structural Sensing, Health Monitoring, and Performance Evaluation

Structural Sensing, Health Monitoring, and Performance Evaluation

Author: D. Huston

Publisher: CRC Press

Published: 2010-09-21

Total Pages: 664

ISBN-13: 1420012355

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Structural health monitoring (SHM) uses one or more in situ sensing systems placed in or around a structure, providing real-time evaluation of its performance and ultimately preventing structural failure. Although most commonly used in civil engineering, such as in roads, bridges, and dams, SHM is now finding applications in other engineering envir


Fiber Bragg Gratings

Fiber Bragg Gratings

Author: Andreas Othonos

Publisher: Artech House Publishers

Published: 1999

Total Pages: 448

ISBN-13:

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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.


Fiber Bragg Grating Based Sensors and Systems

Fiber Bragg Grating Based Sensors and Systems

Author: Oleg Morozov

Publisher: MDPI

Published: 2021-08-18

Total Pages: 228

ISBN-13: 3036512861

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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.


Fiber Bragg Gratings

Fiber Bragg Gratings

Author: Raman Kashyap

Publisher: Academic Press

Published: 2009-10-23

Total Pages: 634

ISBN-13: 008091991X

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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


Effect of Strain Or Stress Applied Using Fiber Bragg Grating Sensor with the Analysis of Apodization on the Performance of the Sensor

Effect of Strain Or Stress Applied Using Fiber Bragg Grating Sensor with the Analysis of Apodization on the Performance of the Sensor

Author: Shilpa Shankar

Publisher:

Published: 2015

Total Pages: 32

ISBN-13: 9781339292922

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Abstract: This project is aimed at designing and optimizing the performance of a Fiber Bragg Grating strain sensor using different apodization profiles. FBG sensors are based on the principle that the Bragg wavelength changes with the change in grating period, length, and reflectivity. Hence, any physical parameter like stress, strain, pressure and temperature that causes a shift in the Bragg wavelength can be measured using an FBG. Ideally to use an FBG in strain sensing applications, it should have high reflectivity, low sidelobe levels and narrow full-width half maximum (FWHM). Based on this theory, an investigation of different apodization profiles on evaluation parameters such as reflectivity, sidelobes, and FWHM is performed. Blackman profile is found to be the best apodization profile, which can be used in sensing applications with the maximum reflectivity of 99.43%, minimum sidelobe levels, and narrow FWHM.


Current Trends in Short- and Long-period Fiber Gratings

Current Trends in Short- and Long-period Fiber Gratings

Author: Christian Cuadrado-Laborde

Publisher: BoD – Books on Demand

Published: 2013-05-15

Total Pages: 198

ISBN-13: 9535111310

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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.