Dissertation > Excellent graduate degree dissertation topics show

Fringe Analysis Technology Based on Wavelet Ridge and Research on Its Application

Author: ZengHuiPing
Tutor: ZhongJinGang
School: Jinan University
Course: Optics
Keywords: Fringe analysis Window Fourier transform Multi-scale window fourier transform Wavelet Ridge Instantaneous frequency Phase
CLC: O438
Type: Master's thesis
Year: 2007
Downloads: 118
Quote: 1
Read: Download Dissertation

Abstract


The amplitude , phase and phase implies the frequency of the main characteristics of the optical fringe signal , characterized in size and variation are widely used in many scientific and engineering applications of precision measurement of displacement , strain and density , as well as radar , Biology , Medicine such as signal detection and diagnosis . This paper begins with wavelet ridge optical stripe signal instantaneous frequency and phase of the basic principles of explanation and put the Fourier transform method based on the instantaneous frequency gradient multi-scale window , and through theoretical analysis, computer simulation and experimental study of the method in three-dimensional measurement, time-frequency analysis of non-stationary signals and other related phase measurement . First , by theoretical analysis and computer simulation analysis of the validity of the instantaneous frequency and phase of the wavelet ridge detection fringe , through changes in the actual frequency and phase of the interference fringe pattern analysis shows that the fringe pattern detection can detect stripes empty discontinuous region , etc. . Secondly , elaborated on the basis of multi - scale window Fourier transform principle , the theoretical analysis the multiscale window Fourier transform time-frequency variation of the window and wavelet multiresolution analysis of the similarities and differences , research -based instantaneous frequency of multi-scale window Fourier transform in the measurement of three-dimensional objects . Accurate as possible in order to improve the frequency resolution and to improve the fundamental frequency extraction , according to the characteristics of the fringe analysis clearly put forward the concept of a stationary length of the local signal , the study of multiscale gradient based on the instantaneous frequency window Fourier transform in the three-dimensional measuring applications, to improve the accuracy of phase extraction and noise suppression . Again , the study based on the instantaneous frequency gradient multi-scale window Fourier transform analysis of non-stationary signals , time-frequency localization ability , and compared with the Winger - Ville distribution and wavelet transform method , given the results of the simulation and experimental analysis . Finally, the Fourier transform method based on the instantaneous frequency multi-scale window used in the analysis of non - stationary white light interference spectrum signal , demodulates the phase of the white light interference spectrum signal , in order to achieve the physical measurement of the film thickness .

Related Dissertations

  1. Research on Physical Properties and Data Processing in the Process of Removing Acid of LNG,TE644
  2. Investigation on Microstructure and Properties of Cadmium-Free Silver-Based Intermediate Temperature Filler Metals,TG425.2
  3. Research on the Integrated Grating Subdividing Digital Display Device Based on DSP,TH822
  4. Signal Detection Circuit Design for Slow-Light Optic Fiber Gyroscope,V241.5
  5. Study on Coupled Radiation-Phase Change Heat Transfer in Semi-Transparent Materials,V259
  6. Study of the High Temperature Gas-Liquid Two Phase Flow Rate Proportional Conrtol Valve,V233.2
  7. Influence of Inclined Secondary Air on Gas-Solid Flows in a W-Shaped Flame Boiler,TK229
  8. Study of Effect of High Temperature Seperator on Hydrodynamices in CFB Boiler Furance,TK229.66
  9. Study on Gas-Solid Two-Phase Flow in Spouted Beds,TK173
  10. Study on Drive and Control System of Five-Phase PMSM Based on FPGA,TM341
  11. Design of Long-Distance and Multi-Axis Driving Control System of Step Motor,TM383.6
  12. Design of Servo Control System with Linear Motor Based on Digital Filter Technology,TM359.4
  13. Grid-Side Converter Control and Wind Turbine Emulator in Direct Drive Wind Power System,TM46
  14. Research of Wavefront Transformation Based on Liquid Crystal Spatial Light Modulator,TN761
  15. Research on Ionosphere Contamination of High Frequency Radar Echoes and Time-Frequency Analysis Technology,TN958.93
  16. Research on Signal Receiving System of Phase Laser Range Finder,TN249
  17. Research on Improvement of DSSS Receiver Based on Phase Domain,TN914.42
  18. Study of Target Simulation and Signal Processing Algorithm for Skywave Over-The-Horizon Radar,TN958.93
  19. Design and Processing of Hybrid Modulated HF Radar Waveform,TN958.93
  20. Preparation, Evaluation, and Application of Several Natural Product Molecularly Imprinted Polymers,R284.1
  21. LF thermal state slag recycling desulfurization behavior of the process,X757

CLC: > Mathematical sciences and chemical > Physics > Optics > Information Optics
© 2012 www.DissertationTopic.Net  Mobile