Dissertation > Excellent graduate degree dissertation topics show

Flow measurement system of fiber grating

Author: WuDengE
Tutor: LvGuoHui
School: Heilongjiang University
Course: Physical Electronics
Keywords: Fiber Bragg Grating Vortex Flow Sensor Wavelength demodulation fluent Software
CLC: TN253
Type: Master's thesis
Year: 2010
Downloads: 95
Quote: 0
Read: Download Dissertation

Abstract


The flow measurement plays an essential role in the petrochemical field. Since most of the measured medium is not only flammable, explosive and corrosive but used in a poor environment. Because it is difficult to fight off the possible explosion of the traditional electronic flow-meter, along with a relatively low level in automation of mechanical flow-meter, so this kind of field need a flow measurement system urgently, this is of high intelligence as well as good security. Focusing on meeting the actual demand, this research made use of fiber grating sensor that is corrosion-resistant and safe intrinsically to achieve new flow measurement system.Based on a deep study of theoretical measurement of flow and sensing principle, this paper had an analysis of the advantages and disadvantages in different types of flow measurement methods. According to the structural characteristics of fiber grating sensors, the combination of fiber grating and vortex flow sensor was carried out to achieve the flow measurement. This fiber Vortex flow-meter has the advantages that include simple structure, convenient installation and precise measurement. Some theoretical analysis about vortex flow sensor and the basic principles of fiber grating sensor were made. Additionally, we also conduct a dynamic analysis in vortex flow field, using dedicated fluid simulation software FLUENT, numerical simulation of the vortex formation and transfer process, and got the curve of the pressure of the point with force-time, namely, indirectly obtain the information upon frequency generated by vortex. We designed and produced a fiber grating Vortex Flow sensor system, including sensor package flange, uniform intensity cantilever, vortex generating body et al and other critical sensing units. There is a high-speed dynamic demodulation of the high-frequency vortex signal by fiber Bragg grating sensor perceived in the experiment, which took advantage of the Coarse Wavelength Division Multiplexing (CWDM). Through the air flow measurement calibration system, the fiber grating Vortex Flow Measuring System has been tested and calibrated successfully, and the flow and the curve of vortex street information upon frequency was observed by us. Experimental data and theoretical values proved a good match, and a curve of the sensor output owned a good linear relationship. It was well-demonstrated in the test and calibration results that the fiber grating can replace piezoelectric devices to achieve vortex flow measurement. Occupying certain advantageous features such as simple structure, low cost and the high-speed wavelength demodulation, this system has a broad application in the flow and measurement field.

Related Dissertations

  1. Optical packet switching in optical code marking technology research,TN929.1
  2. Method for Reducing Crosstalk Interference in an Inline Fabry-Perot Based Fiber Bragg Grating Sensor Array Based on Layer Peeling Algorithm,TP212
  3. Optical Properties of Amplitude Sampled Fiber Gratings Fabricated by Splicing Technology,TN253
  4. Carbon fiber reinforced composites embedded fiber Bragg grating sensing research,TN253
  5. Analysis of the Apodization Technique for Chirped Fiber Bragg Grating,TN253
  6. Multichannel Fiber Bragg Grating Monitoring System Based on DWDM,TN253
  7. The Study of Cable’s Temperature Monitoring Systm Using Distributed Fiber Bragg Grating Based on ARM,TM247
  8. Approach of Fiber Grating Sensing Technology for Dynamic Strain and Cylinder Pressure of Internal Combustion Engine,TK407
  9. A hollow cylinder structure - based fiber Bragg grating under - rotating coaxial cylinder viscometer,TH836
  10. Based shaft seal diaphragm structure fiber Bragg grating target flow sensor,TH814
  11. Applied stress strain fiber Bragg grating temperature sensor,TP212.11
  12. Discuss the Hydrodynamics and Mooring System of a New Type Wave Buoy,P715.2
  13. The Hydrodynamic Characteristic Experiment and Flow Field Simulation Research of Anaerobic Baffled Reactor,X703
  14. Research on Demodulation Technique of Fiber Bragg Grating Sensor Based on Simulated Annealing Algorithm,TP212.14
  15. Study on Temperature Field Measurement in Biomembrane Reactor Based on the Method of Fiber Bragg Grating,X703
  16. Experimental Research and Numerical Simulate the Hydraulic Characteristics of Two Levels Stilling Spillway,TV135
  17. The Research of Multi-user Experiment and Multi-rate Simulation in Two-dimensional OCDMA System,TN929.533
  18. Research on Distributed Fiber Bragg Grating Sensing System,TP212.14
  19. Study of Fiber Bragg Grating Sensor System Based on IWDM/TDM,TP212.9
  20. Fiber Bragg Grating Sensor System Based on CDMA Technology,TP212.14
  21. Study on Sensing Signal Demodulation System for Fiber Bragg Grating Based on LabVIEW,TP212.14

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