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东南大学工程力学系 陈凡秀

Department of Engineering Mechanics, Southeast University, Nanjing,Jiangsu 210096 China. Application of Wavelet Transform for Analyzing Instantaneous Contour of Continual Deformation Object. 东南大学工程力学系 陈凡秀. Method of 3D profilometry. Moire topography:

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东南大学工程力学系 陈凡秀

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  1. Department of Engineering Mechanics, Southeast University, Nanjing,Jiangsu 210096 China Application of Wavelet Transform for Analyzing Instantaneous Contour of Continual Deformation Object 东南大学工程力学系 陈凡秀

  2. Method of 3D profilometry • Moire topography: Proposed by Meadows and Takasaki in the early 1970’s

  3. Fourier transform Fourier transform Filter Inverse Fourier transform Phase Unwrapping

  4. Phase shifting method Limited to surface contouring of static object only • Temporal phase-analysis and temporal phase-unwrapping techniques(late 1990’s) The Fourier-transform method become a popular method • Wavelet transform method (Continuous wavelet transform, CWT)

  5. Continuous wavelet transform (CWT) CWT: (1) Morlet wavelet: (2)

  6. d CCD camera Light source L α γ p Grating α′ γ′ h (x, y) Object (x, y) Fig. 1 Optical geometry Theoretical analysis

  7. (3) (4) (5)

  8. ζ=ω0 / a (6) (7) (8)

  9. Simulation

  10. High-Speed CCD camera White-light source Z X Grating Object Computer Mobile Stage Fig. 3 Experimental setup Experiment and Results

  11. Sample and parameters Fig. 4 Typical moiré fringe patterns of cantilever beam k=22.347 P= 5 lines/mm

  12. Conclusion Fig. 5 The instantaneous contour of T1=0.0025 s and T2=0.047 s.

  13. Thank You For Your Concern!

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