Modelling of optical fibre long-period grafting sensors.

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Hou, Rujie.;
  • Publisher: Sheffield Hallam University,

In this thesis a mathematical model of the long-period fibre grating (LPG) sensor has been developed. Numerical simulation of the LPG transmission spectrum behavior is studied when changing the refractive index of the ambient. The attenuation bands are seen to shift to ... View more
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    2 F I B R E B R A G G G R A T IN G P R O P E R T Y A N D T H E O R Y ................ 8

    I n tr o d u c tio n .......................................................................................................... 8

    Photosensitivity and F abrication o f Fibre G r a ti n g ...........................................8 2.2.1 Photosensitivity in optical f i b r e ......................................................... 8 2.2.2 Physical m echanism behind ph o to sen sitiv ity................................... 9 2.2.2.1 C olour-Centre m o d e l ............................................................ 9 2 .2 2 .2 P erm a n en t electric dipole m o d e l ..................................... 12 2.2.2.3 E n h a n ced p h o to sen sitiv ity in silica o p tica l f i b r e s by hydrogen loading...................................................................14 2.2.3 Fabrication o f fibre grating................................................................15 2.2.3.1 H olographic interferom eter te c h n o l o g y ......................... 16 2.2.3.2 P h a se-m a sk te c h n o lo g y .....................................................17 2.2.3.3 P oint by p o in t w r i t i n g ........................................................ 18

    CHAPTER 4 LONG-PERIOD FIBRE GRATING SENSORS................................. 62 4.1 Introduction.........................................................................................................62 4.2 Temperature Sensor............................................................................................64 4.3 Axial Strain Sensor.............................................................................................66 4.4 Index o f Refraction Sensor................................................................................ 67

    CHAPTER 6 CONCLUSION AND FUTURE WORK ...........................................127 6.1 Conclusion......................................................................................................... 127 6.2 Future Work....................................................................................................... 129

    A PPENDICES.......................................................................................................................137 Appendix 1 Abstract o f Conference Presentation..............................................139 Appendix 2 Submitted Paper..................................................................................140 Appendix 3 MATLAB Codes................................................................................ 148 Appendix 4 General Coupled Mode Theory Formalism....................................167

    Fig. 3.2. Typical FBG temperature sensor [After Kersey, et al 1997].............................. 42

    Fig. 3.3. Temperature response o f FBG sensor [Rastogi 1997]........................................ 44

    Fig. 3.4. Strain response o f FBG sensor [Rastogi 1997].................................................... 45

    Fig. 3.6. Schematic o f typical EDFA with long-period grating gain flattening filter.

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