Note for Fibre Optic Instrumentation - FOI By vtu rangers

Topics ( 12 )

Text from page-1

EI 2404 FIBRE OPTICS AND LASER INSTRUMENTS A Course Material on Fiber optics and Laser instruments By Mrs. A.Saranya Assistant PROFESSOR DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING SASURIE COLLEGE OF ENGINEERING VIJAYAMANGALAM – 638 056 5 SCE DEPARTMENT OF ELECTRICAL AND ELCTRONICS ENGINEERING

Text from page-2

EI 2404 FIBRE OPTICS AND LASER INSTRUMENTS QUALITY CERTIFICATE This is to certify that the e-course material Subject Code Subject Class : EI2404 : Fibre Optics And Laser Instruments : III Year EEE being prepared by me and it meets the knowledge requirement of the university curriculum. Signature of the Author Name: Designation: This is to certify that the course material being prepared by MrsA.Saranya is of adequate quality. She has referred more than five books among them minimum one is from aboard author. Signature of HD Name: SEAL 6 SCE DEPARTMENT OF ELECTRICAL AND ELCTRONICS ENGINEERING

Text from page-3

EI 2404 FIBRE OPTICS AND LASER INSTRUMENTS CONTENTS OPTICAL FIBERS AND THEIR PROPERTIES CHAPTER 1 1.1 Introduction 14 1.2 Construction of optical fiber cable 14 1.2.1 Guiding mechanism in optical fiber 14 1.2.2 Basic component of optical fiber communication 15 Principle of light propagation through a fiber 16 1.3.1 16 1.3 1.4 1.5 1.6 1.7 1.8 1.9 Total internal reflection 1.3.2 Acceptance angle (θa) 18 1.3.3 Numerical aperture 18 1.3.4 Skew mode. 20 Different types of fibers and their properties 21 1.4.1 Single and multimode fibers 21 1.4.2.Step index and graded index fibers 22 Fiber characteristics 23 1.5.1 23 Mechanical characteristics 1.5.2 Transmission characteristics 24 Scattering losses 25 1.6.1 Linear scattering losses 26 1.6.2 Nonlinear scattering losses 27 Dispersion 28 1.7.1 Types of dispersion 28 Splicers 29 1.8.1Types of splicing 29 Connectors and fiber termination 30 1.10 Optical sources 31 7 SCE DEPARTMENT OF ELECTRICAL AND ELCTRONICS ENGINEERING

Text from page-4

EI 2404 FIBRE OPTICS AND LASER INSTRUMENTS 1.10.1 Light Emitting Diode (LED) 31 1.11 Photo detectors 32 1.11.1 PIN Diode 31 CHAPTER 2 INDUSTRIAL APPLICATION OF OPTICAL FIBERS 2.1 Introduction 33 2.2 Fiber optic sensor 33 2.2.1Fiber optic sensor principles 34 2.2.2 Types of fiber optics sensor 34 2.3 2.4 2.5 2.2.2.1 Intrinsic sensor- Temperature/ Pressure sensor 34 2.2.2.2 Extrinsic sensors 36 2.2.2.3 Phase Modulated Fibre Optic Sensor 37 2.2.2.4 Displacementsensor (Extrinsic Sensor) 38 Fiber Optic Instrumentation System 39 2.3.1ntroduction 39 2.3.2 Measurement of attenuation (by cut back method) 39 2.3.3 Optical domain reflectometers 40 2.3.4 Fiber Scattering loss Measurement 41 2.3.5 Fiber Absorption Measurement 42 2.3.6 Fiber dispersion measurements 43 2.3.7 End reflection method 44 2.3.8 Near field scanning techniques 45 Classification of optical modulators 45 2.4.1 Electro-optic modulator (EOM) 45 Measurement using fiber optics sensor 49 2.5.1 Measurement of pressure 49 2.5.2 Measurement of temperature 49 8 SCE DEPARTMENT OF ELECTRICAL AND ELCTRONICS ENGINEERING