Dissertation > Excellent graduate degree dissertation topics show

Multichannel Fiber Bragg Grating Monitoring System Based on DWDM

Author: XuTieLong
Tutor: LiuTieGen
School: Tianjin University
Course: Photonics technology
Keywords: Fiber Bragg Grating DWDM Engine Multichannel
CLC: TN253
Type: Master's thesis
Year: 2010
Downloads: 101
Quote: 0
Read: Download Dissertation


Fiber Bragg grating sensor is belonged to one of the Fiber sensors , it obtain sensing signal through the fiber Bragg wavelength which is affected by the physical quantity. As one of the wavelength optical-fiber sensor, it has powerful anti-disturbing capability and easy carrying, that is why the application of the fiber Bragg grating in sensor field has been widespread concern at home and abroad. There are some demodulation products for fiber grating sensors, which are mostly based on active demodulation technologies, and the sampling rate is between several hertz to several hundred hertz or so, can only meet the needs of static or quasi-static measurement, but is not enough to achieve the geological monitoring with high-speed and multichannel in dynamic environment. In order to adapt the requirement of dynamic measurement, increasing the sampling and transmission speed of the fiber grating demodulation is needed. As a result, the design of the high-speed fiber Bragg grating demodulation with multichannel based on DWDM is proposed in this paper. The design of optical path, circuit board and software is completed in this paper, which achieves the high-speed transmission with multichannel of fiber Bragg grating demodulation, the date processing, display, storage and analysis on computer.1、The demodulation for wavelength code in optical path is designed based on Dense Wavelength Division Multiplexing (DWDW). The performance test on DWDM is done, the experiment result shows that the effective interval in the every channel is from 1550.934nm to 1551.884nm, from 1553.280nm to 1554.205nm, from 1555.725nm to 1556.665nm and from 1558.365nm to 1559.265nm, and the sensitivity in each channel is arrived at 45dB/nm, which makes the response speed and wavelength resolution ratio rate high.2、The Complex Programmable Logic Device (CPLD) is used as the main chip in the design of the acquisition and data transmission, including the controlling of the high-speed multichannel A/D chip and the interface control circuit of USB in the project.3、The main interactive mode software is completed based on Labview 8.5, which achieves the function of the display, storage and analysis. 4、Completed encapsulation of the FBG sensors, which is packaged on the surface of the engine, and the other is packaged as the pressure sensor used for measuring the pressure of the engine.5、The monitoring system is build to analyze and research sampling rate, transmission performance, wavelength range, resolution and precision of the demodulation. The experiment results show that the sampling rate is 200 KHz for each channel, and dynamic signals on 20 KHz can be demodulated well. What is more, the relationship of surface-vibration and wavelength of the FBG sensor, and relationship of pressure of the engine and angle are researched.

Related Dissertations

  1. Study of the High Temperature Gas-Liquid Two Phase Flow Rate Proportional Conrtol Valve,V233.2
  2. High Speed Aerodynamic Convection and Coupled Heat Transfer of Complicated Bodies,V215.4
  3. Robust Control Research on Automotive Engine Idle-Speed,U464
  4. Research on Nozzle Plume Temperature Distribution Measurement System,V434
  5. Research and Realization on Automatic Generation of Computing Engine for Myocardial Cell Electrophysiological Simulation,R319
  6. High Pressure Common Rail Diesel Engine Fueled with Biodiesel test under different atmospheric pressure,TE667
  7. Applied Research of Emulsified Fuel on S195 Diesel Engine,TE626.24
  8. Design and Development of the Early-Warning System for Soil Pollution Based on .NET and ArcGIS Engine,X833
  9. Development of Tractor’s Virtual Instrument System Based on CAN Bus,S219.02
  10. Web search engine related technology research,G354
  11. Search Engine Provider Copyright Infringement Liability Standard Discussion,D923.41
  12. The mechanical hydraulic Confined Piston Engine multidisciplinary collaborative optimization design support environmental research,TP311.52
  13. The turbofan engine pneumatic runner Optimization Approach,V235.13
  14. The Research of Encryption Method Based on the Solid State Disk,TP309.7
  15. Web application system design based on Google's cloud computing platform and,TP393.09
  16. Research on Business Process Integration of Die & Mould Enterprise,TG76
  17. The Design and Implementation of Widget Architecture in Three-dimensional Graphics System,TP391.41
  18. The Research on 3G Transmission Network Panning Solution of China Telecom Lianyungang Branch,TN929.5
  19. Process Engine based automated testing for Web Services Research,TP311.52
  20. Direct3D-based 3D flight shooting game research,TP393.09
  21. MySQL storage Security Research and Implementation,TP311.13

CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
© 2012 www.DissertationTopic.Net  Mobile