Simple Power Transformer Fiber Bragg Grating Temperature Sensor
Simple Power Transformer Fiber Bragg Grating Temperature Sensor

Author: Faezeh Mobasheri

Publisher:

Published: 2016

Total Pages: 78

ISBN-13:

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This study has designed, developed, and tested a high temperature sensor based on Fiber Bragg grating. The new introduced interrogation system makes the sensor suitable for installation inside the power transformer. Unlike the existing fiber Bragg grating based temperature sensors, the interrogation system of the sensor is based on amplitude modulation (AM). The distinctive characteristics of the designed temperature sensor, in addition to inherent advantages of FBG is, its real-time monitoring, small size, and low cost. The sensor is tested in harsh environment at temperature starting from -27 ºC to 400 ºC. The long-term stability and reliability of the designed sensors of one sensor head is tested in furnace at 400 ºC for 338 hours. Furthermore, the sensor head was under test in 600 ºC for about 18 hours. The sensor head which is used in this experiment is fiber Bragg grating Corning SMF-28, Ge-doped optical fibers with 4% Ge content in its core. It was loaded with hydrogen prior to writing with 248 nm excimer laser. The Bragg wavelength of the two prepared sensors head for this work is around 1530 nm and 1550 nm. In this study, we used Amplified spontaneous emission (ASE) light source as an input light for the sensor head. ASE light source makes it possible to have linear input light in two different ranges with 4 nm span. The sensors head Bragg wavelength is designed in the range in which the ASE light source spectrum is linear. The sensor has the Photodiode (PD) to convert the Bragg reflected spectrum power into its equivalent current.

Optical Temperature Monitoring of Electrical Power Transformer Networks
Optical Temperature Monitoring of Electrical Power Transformer Networks

Author: Sanathanan Velaswamy Thangaraj

Publisher:

Published: 2012

Total Pages: 142

ISBN-13:

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This thesis presents an optical sensor network model designed to monitor temperature of transformers at multiple substations from one central location. Fiber Bragg Grating (FBG) has been used as the optical sensing element for transformer temperature monitoring. Suitable FBG parameters and specifications have been investigated and modeled that fit best for this application. Optical sensor network is laid on top of the transmission line network. This reduced the cost of fiber installation. The wavelengths of backscattered light at different temperatures for the modeled Fiber Bragg Grating have been obtained. These values are used as a reference to find the actual temperature of the transformers from the central station. Different network topologies that can be implemented for such applications are presented and the most suitable one is assessed for link budget and cost analysis of the optical sensor network. The temperature sensing range is from 30°C to 90°C. The minimum temperature accuracy that can be achieved is about 0.010C. Time Division Multiplexing (TDM) is employed to identify individual transformers in the network at the central station. A Model to find an optimal node to place the optical sources is also presented. The temperature monitoring of standard IEEE transmission networks has been obtained.

Optical Sensing in Power Transformers
Optical Sensing in Power Transformers

Author: Jun Jiang

Publisher: John Wiley & Sons

Published: 2020-12-07

Total Pages: 256

ISBN-13: 1119765293

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A cutting-edge, advanced level, exploration of optical sensing application in power transformers Optical Sensing in Power Transformers is filled with the critical information and knowledge on the optical techniques applied in power transformers, which are important and expensive components in the electric power system. Effective monitoring of systems has proven to decrease the transformer lifecycle cost and increase a high level of availability and reliability. It is commonly held that optical sensing techniques will play an increasingly significant role in online monitoring of power transformers. In this comprehensive text, the authors—noted experts on the topic—present a scholarly review of the various cutting-edge optical principles and methodologies adopted for online monitoring of power transformers. Grounded in the authors’ extensive research, the book examines optical techniques and high-voltage equipment testing and provides the foundation for further application, prototype, and manufacturing. The book explores the principles, installation, operation, condition detection, monitoring, and fault diagnosis of power transformers. This important text; Provides a current exploration of optical sensing application in power transformers Examines the critical balance and pros and cons of cost and quality of various optical condition monitoring techniques Presents a wide selection of techniques with appropriate technical background Extends the vision of condition monitoring testing and analysis Treats condition monitoring testing and analysis tools together in a coherent framework Written for researchers, technical research and development personnel, manufacturers, and frontline engineers, Optical Sensing in Power Transformers offers an up-to-date review of the most recent developments of optical sensing application in power transformers.

Optical Fiber Sensor Technology
Optical Fiber Sensor Technology

Author: L.S. Grattan

Publisher: Springer Science & Business Media

Published: 1997-12-31

Total Pages: 464

ISBN-13: 9780412782909

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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.

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.

Fiber Bragg Grating Sensors: Development and Applications
Fiber Bragg Grating Sensors: Development and Applications

Author: Hisham Hisham

Publisher: CRC Press

Published: 2019-06-19

Total Pages: 137

ISBN-13: 1000021343

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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.

Optical Sensing in Power Transformers
Optical Sensing in Power Transformers

Author: Jun Jiang

Publisher: John Wiley & Sons

Published: 2020-12-02

Total Pages: 256

ISBN-13: 1119765307

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A cutting-edge, advanced level, exploration of optical sensing application in power transformers Optical Sensing in Power Transformers is filled with the critical information and knowledge on the optical techniques applied in power transformers, which are important and expensive components in the electric power system. Effective monitoring of systems has proven to decrease the transformer lifecycle cost and increase a high level of availability and reliability. It is commonly held that optical sensing techniques will play an increasingly significant role in online monitoring of power transformers. In this comprehensive text, the authors—noted experts on the topic—present a scholarly review of the various cutting-edge optical principles and methodologies adopted for online monitoring of power transformers. Grounded in the authors' extensive research, the book examines optical techniques and high-voltage equipment testing and provides the foundation for further application, prototype, and manufacturing. The book explores the principles, installation, operation, condition detection, monitoring, and fault diagnosis of power transformers. This important text: Provides a current exploration of optical sensing application in power transformers Examines the critical balance and pros and cons of cost and quality of various optical condition monitoring techniques Presents a wide selection of techniques with appropriate technical background Extends the vision of condition monitoring testing and analysis Treats condition monitoring testing and analysis tools together in a coherent framework Written for researchers, technical research and development personnel, manufacturers, and frontline engineers, Optical Sensing in Power Transformers offers an up-to-date review of the most recent developments of optical sensing application in power transformers.

Optical Fiber Sensor Technology
Optical Fiber Sensor Technology

Author: L.S. Grattan

Publisher: Springer Science & Business Media

Published: 2012-12-06

Total Pages: 445

ISBN-13: 1461557879

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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.

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.