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Title:
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Temporal wavelet analysis for deformation and velocity measurement in speckle interferometry.
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Author:
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Fu, Yu.; Tay, Cho Jui.; Quan, Chenggen.; Chen, Lujie.
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Copyright year:
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2004 |
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Abstract:
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When a continuously deforming object is measured by electronic
speckle pattern interferometry (ESPI), the speckle pattern recorded
on a camera sensor changes constantly. These time-dependent
speckle patterns would provide the deformation history of the object.
Various objects are applied with both linearly and nonlinearly varying
loads and speckle patterns are captured using a high-speed CCD camera.
The temporal intensity variation of each pixel on the recorded images
is analyzed by a robust mathematical tool—Morlet wavelet transform
instead of conventional Fourier transform. The transient velocity
and displacement of each point can be retrieved without the necessity of
the temporal or spatial phase unwrapping process. The displacements
obtained are compared with those from a temporal Fourier transform,
and the results show that the wavelet transform minimizes the influence
of noise and provides better results for a linearly varying load. System
error in the wavelet analysis for nonlinear load is also discussed. |
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Subject:
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DRNTU::Science::Physics::Optics and light. |
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Type:
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Journal Article |
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Series/ Journal Title:
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Optical Engineering |
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Research Centre:
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Temasek Laboratories |
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Rights:
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Copyright 2004 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. |
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Version:
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Published version |
