CAPTEUR DE TEMPERATURE A FIBRE PAR EFFET MODAL PDF Download

Author: TIOMAN.. AKA
Publisher:
ISBN:
Category :
Languages : fr
Pages :

View

Book Description
CERTAINS PHENOMENES PHYSIQUES PROPRES A UN MILIEU PEUVENT ETRE DETECTES ET MESURES PAR MODULATION EN PHASE, INTENSITE, POLARISATION, FREQUENCE, DE LA LUMIERE CIRCULANT DANS UNE FIBRE OPTIQUE PLONGEE DANS CE MILIEU. POUR REALISER UN CAPTEUR A FIBRE OPTIQUE A PARTIR DE CES POSSIBILITES, IL FAUT SEPARER LES EFFETS OPTIQUES DES DIFFERENTS PARAMETRES PHYSIQUES AGISSANT CONJOINTEMENT SUR UNE FIBRE OPTIQUE. NOUS PROPOSONS UNE METHODE ABOUTISSANT A UN DISPOSITIF DE TYPE CAPTEUR INTRINSEQUE A FIBRE OPTIQUE DE TEMPERATURE. POUR CELA, NOUS ANALYSONS D'ABORD LES PERTES RESULTANT DE VARIATIONS CONJOINTES DE LA TEMPERATURE ET DE LA COURBURE D'UNE FIBRE OPTIQUE. NOUS EN DEDUISONS LES FONCTIONS RELIANT LA LUMIERE TRANSMISE PAR UNE FIBRE A SA TEMPERATURE EN PRENANT EN COMPTE LES VARIATIONS D'INDICE DE LA GAINE OPTIQUE ET DU CUR PAR EFFET DE COURBURE. NOUS DEMONTRONS ENSUITE LA FAISABILITE DU CAPTEUR PAR UNE APPROCHE THEORIQUE ET EXPERIMENTALE. LE CAPTEUR OBTENU A UNE SENSIBILITE DE 10##2#OC AUX TEMPERATURES USUELLES ET EST INSENSIBLE AUX VARIATIONS DE PRESSION ET DES AUTRES PARAMETRES PHYSIQUES DANS UN DOMAINE D'EXPLOITATION SUFFISAMMENT LARGE POUR CONCLURE A UNE POSSIBILITE D'INDUSTRIALISATION

Author: Philippe Di Bin
Publisher:
ISBN:
Category :
Languages : fr
Pages : 192

View

Book Description
LES COMPOSANTS A FIBRES OPTIQUES MULTIMODES PRESENTENT DES CARACTERISTIQUES OPTIQUES DEPENDANT DU CONTENU MODAL EN LIGNE. UNE PREMIERE PARTIE DE NOTRE ETUDE PORTE SUR LE DEVELOPPEMENT DE MOYENS THEORIQUES ET EXPERIMENTAUX D'EVALUATION DU COMPORTEMENT MODAL DE COMPOSANTS MULTIMODES. LA REALISATION D'UN BANC DE MESURES COMPORTANT UNE SOURCE MODALE SELECTIVE A PERMIS LA CARACTERISATION DE CONNECTEURS, DE COUPLEURS ET DE COMPOSANTS REFLECTIFS. UNE NOUVELLE METHODE DE MESURE DES EXCENTREMENTS ENTRE LES FIBRES D'UNE CONNEXION EST PROPOSEE. LES ENSEIGNEMENTS ISSUS DE L'ANALYSE MODALE ONT ETE MIS A PROFIT POUR LA CONCEPTION D'UN CAPTEUR A FIBRE OPTIQUE DE TYPE REFLECTIF DESTINE A LA MESURE ANALOGIQUE DE LA TEMPERATURE. SUR UNE PLAGE ALLANT DE 20C A +150C, LA PRECISION DE CE CAPTEUR EST DE L'ORDRE DE 1C. IL EST ADAPTE A UN FONCTIONNEMENT EN RESEAU DANS LEQUEL LES INFORMATIONS ISSUES DE CHACUN DES POINTS DE MESURES SONT MULTIPLEXEES TEMPORELLEMENT

Author: Mohamed Benbouzid
Publisher: MDPI
ISBN: 3039282786
Category : Technology & Engineering
Languages : en
Pages : 174

View

Book Description
The worldwide potential of electric power generation from marine tidal currents, waves, or offshore winds is enormous. The high load factor resulting from the fluid properties and the predictable resource characteristics make tidal and wave energy resources attractive and advantageous for power generation and advantageous when compared to other renewable energies. The technologies are just beginning to reach technical and economic viability to make them potential commercial power sources in the near future. While only a few small projects currently exist, the technology is advancing rapidly and has huge potential for generating bulk power. Moreover, international treaties related to climate control and dwindling fossil fuel resources have encouraged us to harness energy sustainably from such marine renewable sources. Several demonstrative projects have been scheduled to capture tidal and wave energies. A number of these projects have now reached a relatively mature stage and are close to completion. However, very little is known to the academic world about these technologies beyond the basics of their energy conversion principles. While research emphasis is more towards hydrodynamics and turbine design, very limited activities are witnessed in power conversion interface, control, and power quality aspects. Regarding this emerging and promising area of research, this book aims to present recent results, serving to promote successful marine renewable energies integration to the grid or to standalone microgrids.

Author: Sofiane Bououden
Publisher: Springer Nature
ISBN: 9811564035
Category : Technology & Engineering
Languages : en
Pages : 1257

View

Book Description
This book gathers papers presented during the 4th International Conference on Electrical Engineering and Control Applications. It covers new control system models, troubleshooting tips and complex system requirements, such as increased speed, precision and remote capabilities. Additionally, the papers discuss not only the engineering aspects of signal processing and various practical issues in the broad field of information transmission, but also novel technologies for communication networks and modern antenna design. This book is intended for researchers, engineers and advanced postgraduate students in the fields of control and electrical engineering, computer science and signal processing, as well as mechanical and chemical engineering.

Author: North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Structures and Materials Panel. Meeting
Publisher:
ISBN: 9789283600374
Category : Airplanes
Languages : en
Pages : 190

View

Book Description

Author: Amiya Ranjan Mohanty
Publisher: CRC Press
ISBN: 1466593059
Category : Science
Languages : en
Pages : 282

View

Book Description
Find the Fault in the Machines Drawing on the author’s more than two decades of experience with machinery condition monitoring and consulting for industries in India and abroad, Machinery Condition Monitoring: Principles and Practices introduces the practicing engineer to the techniques used to effectively detect and diagnose faults in machines. Providing the working principle behind the instruments, the important elements of machines as well as the technique to understand their conditions, this text presents every available method of machine fault detection occurring in machines in general, and rotating machines in particular. A Single-Source Solution for Practice Machinery Conditioning Monitoring Since vibration is one of the most widely used fault detection techniques, the book offers an assessment of vibration analysis and rotor-dynamics. It also covers the techniques of wear and debris analysis, and motor current signature analysis to detect faults in rotating mechanical systems as well as thermography, the nondestructive test NDT techniques (ultrasonics and radiography), and additional methods. The author includes relevant case studies from his own experience spanning over the past 20 years, and detailing practical fault diagnosis exercises involving various industries ranging from steel and cement plants to gas turbine driven frigates. While mathematics is kept to a minimum, he also provides worked examples and MATLAB® codes. This book contains 15 chapters and provides topical information that includes: A brief overview of the maintenance techniques Fundamentals of machinery vibration and rotor dynamics Basics of signal processing and instrumentation, which are essential for monitoring the health of machines Requirements of vibration monitoring and noise monitoring Electrical machinery faults Thermography for condition monitoring Techniques of wear debris analysis and some of the nondestructive test (NDT) techniques for condition monitoring like ultrasonics and radiography Machine tool condition monitoring Engineering failure analysis Several case studies, mostly on failure analysis, from the author’s consulting experience Machinery Condition Monitoring: Principles and Practices presents the latest techniques in fault diagnosis and prognosis, provides many real-life practical examples, and empowers you to diagnose the faults in machines all on your own.

Author: Fuh-Gwo Yuan
Publisher: Woodhead Publishing
ISBN: 0081001584
Category : Technology & Engineering
Languages : en
Pages : 516

View

Book Description
Structural Health Monitoring (SHM) in Aerospace Structures provides readers with the spectacular progress that has taken place over the last twenty years with respect to the area of Structural Health Monitoring (SHM). The widespread adoption of SHM could both significantly improve safety and reduce maintenance and repair expenses that are estimated to be about a quarter of an aircraft fleet’s operating costs. The SHM field encompasses transdisciplinary areas, including smart materials, sensors and actuators, damage diagnosis and prognosis, signal and image processing algorithms, wireless intelligent sensing, data fusion, and energy harvesting. This book focuses on how SHM techniques are applied to aircraft structures with particular emphasis on composite materials, and is divided into four main parts. Part One provides an overview of SHM technologies for damage detection, diagnosis, and prognosis in aerospace structures. Part Two moves on to analyze smart materials for SHM in aerospace structures, such as piezoelectric materials, optical fibers, and flexoelectricity. In addition, this also includes two vibration-based energy harvesting techniques for powering wireless sensors based on piezoelectric electromechanical coupling and diamagnetic levitation. Part Three explores innovative SHM technologies for damage diagnosis in aerospace structures. Chapters within this section include sparse array imaging techniques and phase array techniques for damage detection. The final section of the volume details innovative SHM technologies for damage prognosis in aerospace structures. This book serves as a key reference for researchers working within this industry, academic, and government research agencies developing new systems for the SHM of aerospace structures and materials scientists. Provides key information on the potential of SHM in reducing maintenance and repair costs Analyzes current SHM technologies and sensing systems, highlighting the innovation in each area Encompasses chapters on smart materials such as electroactive polymers and optical fibers

Author: Gustav Gautschi
Publisher: Springer Science & Business Media
ISBN: 3662047322
Category : Technology & Engineering
Languages : en
Pages : 271

View

Book Description
For the first time, this book covers the entire field of piezoelectric sensors for mechanical measurands. It gives extensive practical advice along with an overview of the most important piezoelectric materials and their properties, plus consistent terminology for describing sensors.

Author: Nasser Ashgriz
Publisher: Springer Science & Business Media
ISBN: 1441972641
Category : Technology & Engineering
Languages : en
Pages : 922

View

Book Description
Atomization and sprays are used in a wide range of industries: mechanical, chemical, aerospace, and civil engineering; material science and metallurgy; food; pharmaceutical, forestry, environmental protection; medicine; agriculture; meteorology and others. Some specific applications are spray combustion in furnaces, gas turbines and rockets, spray drying and cooling, air conditioning, powdered metallurgy, spray painting and coating, inhalation therapy, and many others. The Handbook of Atomization and Sprays will bring together the fundamental and applied material from all fields into one comprehensive source. Subject areas included in the reference are droplets, theoretical models and numerical simulations, phase Doppler particle analysis, applications, devices and more.

Author: J. Belle
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 146

View

Book Description