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研究生： Nafiul Matiin
Nafiul - Matiin
論文名稱： 運用低同調性干涉儀於單多模光纖間之應變監測
Strain Sensing Comparison Between Single And Multimode Fibers Using Optical Low Coherence Interferometry
指導教授： 徐世祥
Shih-Hsiang Hsu
口試委員: 莊敏宏
Miin-Horng Juang
張勝良
Sheng-Lyang Jang
黃柏仁
Bohr-Ran Huang
學位類別： 碩士
Master
系所名稱： 電資學院 - 光電工程研究所
Graduate Institute of Electro-Optical Engineering
論文出版年： 2014
畢業學年度： 102
語文別： 英文
論文頁數： 69
中文關鍵詞： 光纖環光腔衰盪 、低同調性干涉儀 、應變感測
外文關鍵詞： FLRD, low coherence interferometry, strain sensor
相關次數： 點閱：282  下載：19 
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    • Fiber loop ring-down (FLRD) is a potential new generation of fiber optic sensor (FOS) which sensing mechanism is based on the ring-down time change of the fiber loop. FLRD takes advantage of cavity ring-down spectroscopy with high detection, fast response, and insensitivity to light source fluctuation for fiber optic sensing features of low cost, light weight and small footprint. FLRD strain sensing was characterized by the mechanical deformation from the fiber ring head sensor, which correlated the additional optical loss of a fiber ring with ring-down time. With this technique, the strain measurement could be demonstrated in a time domain by the ring-down time. Strain sensor with FLRD technique would be studied in this thesis.
    Optical low coherence interferometry is one of the accurate optical sensing technologies and widely utilized in various physical sensing properties. The system principle is to characterize the relative interferogram movement distance caused by the various strain on a sensing arm. An interferometric strain sensor from two-stage Mach-Zehnder interferometer was demonstrated for double sensitivity improvement. The strain performance comparison between single and multimode fibers will be analyzed for fiber sensing applications.
    The stepper motor was set up with a movement distance of 20 nm in every step and the velocity could achieve 10000 step/s. The fiber strain was characterized as 22.22 με on a 9-cm length. The experimental results demonstrated the multimode fiber sensitivity is higher than single mode fiber. Repeatability of both single and multimode are uncertain. The interferogram movement distance from the multimode fiber was higher than a single mode and demonstrates higher sensitivity.

    ABSTRACT ii ACKNOWLEDGEMENT iii TABLE OF CONTENTS iv LIST OF FIGURES vii LIST OF TABLES ix CHAPTER 1 INTRODUCTION 1 1.1 Background and Motivation 1 1.2 Objective 9 1.3 Organization of Thesis Report 9 CHAPTER 2 FIBER LOOP RING-DOWN (FLRD) THEORY 10 2.1 Introduction 10 2.2 Cavity Ring down Spectroscopy (CRDS) Principle 11 2.3 Fiber Loop Ring down (FLRD) 12 2.3.1 Fiber Ring Resonator 13 2.3.2 Basic Principle of FLRD 19 2.4 Mechanical Strain Principle 21 2.5 Fiber Loop Ring-down (FLRD) Strain Sensor 23 2.6 Fiber Loop Ring-down Sensor System 25 2.6.1 Trip time (tr) and ring-down time (τo) of the system 25 2.6.2 Sensitivity of FLRD 26 2.6.3 FLRD Sensor Set-Up 27   CHAPTER 3 LOW COHERENCE MACH-ZEHNDER INTERFEROMETRY STRAIN SENSOR THEORY 29 3.1 Introduction 29 3.2 Low Coherence Interferometry Principle 29 3.3 Mach Zehnder Interferometer 32 3.4 Optical Fibers 33 3.4.1 Single Mode Fiber 33 3.4.2 Multi Mode Fiber 33 3.5 Super Luminescent Light Emitting Diode (SLED) 35 3.6 Fiber Optics Strain Gauge 36 CHAPTER 4 RESEARCH DESIGN AND METODHOLOGY 40 4.1 Research Design 40 4.2 Experiment Set Up 42 4.3 Experimental Method 43 CHAPTER 5 RESULT AND DISCUSSION 45 5.1 Setting Interferometer System 45 5.1.1 Sensing Part 45 5.1.2 Analyzing Part 45 5.2 Strain Measurement System 47 5.2.1 Strain Characterization of Single Mode Fiber 47 5.2.2 Strain Characterization of Multimode Fiber 47 5.3 SMF and MMF Comparison 48 5.3.1 Sensitivity and repeatability 49 5.3.2 Transmission Loss and Noise 50 CHAPTER 6 CONCLUSION AND FUTURE WORK 52 6.1 Conclusion 52 6.2 Future Work 52 REFERENCE 54

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