| Abstract | 第3-5页 |
| 摘要 | 第6-11页 |
| 扩展中文摘要 | 第11-24页 |
| Chapter 1 Introduction | 第24-48页 |
| 1.1 Research Background | 第24-26页 |
| 1.2. State-of-the-art of long-range and high spatial resolution BOTDA sensors | 第26-46页 |
| 1.2.1 Long-range sensing | 第27-32页 |
| 1.2.2 Review of some high spatial resolutions sensing techniques based on BOTDA | 第32-46页 |
| 1.2.2.1 DPP-BOTDA | 第34-36页 |
| 1.2.2.2 High spatial resolution using simultaneously gain and loss pump pules | 第36-40页 |
| 1.2.2.2.1 Principle of functioning of ODPA | 第36-40页 |
| 1.2.2.3 Stokes and anti-Stokes differential pulse with pair interacting with a three-tone probe wave | 第40-42页 |
| 1.2.2.4 High spatial resolution based on the acoustic wave pre-excitation | 第42-46页 |
| 1.3 Significance and objective | 第46-47页 |
| 1.4 Organization of the thesis | 第47-48页 |
| Chapter 2 Theory of light scattering in the optical fiber | 第48-68页 |
| 2.1 Introduction | 第48页 |
| 2.2 Light scattering | 第48-49页 |
| 2.3 Spontaneous and stimulated light scattering | 第49页 |
| 2.4 Different types of scattering and their characteristics | 第49-51页 |
| 2.5 Fluctuation and distribution of the optical properties | 第51-54页 |
| 2.5.1 Thermodynamic approach of scalar light scattering | 第52页 |
| 2.5.2 Scalar scattering in optical fiber | 第52-53页 |
| 2.5.3 Density variations and light scattering | 第53-54页 |
| 2.6 Brillouin scattering and optical fiber sensing | 第54-61页 |
| 2.6.1 Intensity | 第56页 |
| 2.6.2 Frequency Shift | 第56-57页 |
| 2.6.3 Linewidth | 第57页 |
| 2.6.4 Temperature and strain effects | 第57-58页 |
| 2.6.5 Acoustic waves and Brillouin scattering | 第58页 |
| 2.6.6 Thermal motion and acoustic phonons | 第58-59页 |
| 2.6.7 Acoustic wave propagation | 第59-61页 |
| 2.7 Electrostriction | 第61-62页 |
| 2.7.1 Stimulated Brillouin scattering induced by electrostriction | 第61-62页 |
| 2.7.1.1 Brillouin generator and Brillouin amplifier | 第61-62页 |
| 2.8 Theoretical formulation of stimulated Brillouin scattering | 第62-67页 |
| 2.9 SBS power threshold | 第67页 |
| 2.10 Summary | 第67-68页 |
| Chapter 3 Theoretical study of Brillouin gain spectrum in the optical fiber | 第68-86页 |
| 3.1 Theoretical analysis of Brillouin gain spectrum | 第69-71页 |
| 3.2 Numerical validation | 第71-84页 |
| 3.2.1 BGS provided by single pulse BOTDA | 第72-74页 |
| 3.2.2 BGS provided by DPP-BOTDA | 第74-76页 |
| 3.2.3 Double-peak BGS | 第76-84页 |
| 3.3 Summary | 第84-86页 |
| Chapter 4 Detecting cm scale events using the double-peak BGS technique based on DPP-BOTDA | 第86-104页 |
| 4.1 Introduction | 第86-87页 |
| 4.2 Experimental validation of the Double-Peak BGS technique | 第87-92页 |
| 4.2.1 Experimental setup | 第87-89页 |
| 4.2.2 Results and discussions | 第89-92页 |
| 4.3 Double-peak BGS based on DPP-BOTDA for cm-scale events detection in long sensing range | 第92-103页 |
| 4.3.1 Detecting 5cm perturbation over 6km-long SMF fiber by using the double-peak BGS based on DPP-BOTDA | 第93-97页 |
| 4.3.2 Detecting a 5cm hotspot at the far end of 24km-long SMF using the double-peak BGS based on DPP-BOTDA technique | 第97-103页 |
| 4.4 Summary | 第103-104页 |
| Chapter 5 Conclusion | 第104-108页 |
| References | 第108-117页 |
| Papers published during the doctoral study | 第117页 |
| Patents | 第117-119页 |
| Acknowledgements | 第119页 |
