Determination of curvature and twist by digital shearography and wavelet transforms
A new technique based on digital shearography for determining the transient curvature and twist of a continuously deforming object from a series of speckle patterns is presented. The intensity variation of each pixel is analyzed along the...
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| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/92036 http://hdl.handle.net/10220/6470 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | A new technique based on digital shearography for determining the transient curvature and twist of a continuously
deforming object from a series of speckle patterns is presented. The intensity variation of each
pixel is analyzed along the time axis by using a complex Morlet wavelet transform. The absolute sign of the
phase variation is determined by introduction of a temporal carrier when the speckle patterns are captured
by a high-speed camera. A high-quality spatial distribution of the deflection derivative is extracted at any
instant without the need for temporal or spatial phase unwrapping. The continuous Haar wavelet transform
is subsequently processed as a differentiation operator to reconstruct the instantaneous curvature and twist
of a continuously deforming object. |
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