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...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2010
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/92036 http://hdl.handle.net/10220/6470 |
| _version_ | 1811696311743807488 |
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| author | Tay, Cho Jui Fu, Yu |
| author2 | Temasek Laboratories |
| author_facet | Temasek Laboratories Tay, Cho Jui Fu, Yu |
| author_sort | Tay, Cho Jui |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T07:37:21Z |
| format | Journal Article |
| id | ntu-10356/92036 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T07:37:21Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | ntu-10356/920362020-09-26T22:19:18Z Determination of curvature and twist by digital shearography and wavelet transforms Tay, Cho Jui Fu, Yu Temasek Laboratories DRNTU::Science::Physics::Optics and light 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. Published version 2010-11-23T08:27:09Z 2019-12-06T18:16:11Z 2010-11-23T08:27:09Z 2019-12-06T18:16:11Z 2005 2005 Journal Article Tay. C. J., & Fu, Y. (2005). Determination of curvature and twist by digital shearography and wavelet transform. Optics Letters, 30(21), 2873-2875. 0146-9592 https://hdl.handle.net/10356/92036 http://hdl.handle.net/10220/6470 10.1364/OL.30.002873 en Optics Letters This paper was published in [Optics Letters] and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: [http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-30-21-2873]. Systematic or multiple reproduction or distribution to multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law. 3 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Tay, Cho Jui Fu, Yu Determination of curvature and twist by digital shearography and wavelet transforms |
| title | Determination of curvature and twist by digital shearography and wavelet transforms |
| title_full | Determination of curvature and twist by digital shearography and wavelet transforms |
| title_fullStr | Determination of curvature and twist by digital shearography and wavelet transforms |
| title_full_unstemmed | Determination of curvature and twist by digital shearography and wavelet transforms |
| title_short | Determination of curvature and twist by digital shearography and wavelet transforms |
| title_sort | determination of curvature and twist by digital shearography and wavelet transforms |
| topic | DRNTU::Science::Physics::Optics and light |
| url | https://hdl.handle.net/10356/92036 http://hdl.handle.net/10220/6470 |
| work_keys_str_mv | AT taychojui determinationofcurvatureandtwistbydigitalshearographyandwavelettransforms AT fuyu determinationofcurvatureandtwistbydigitalshearographyandwavelettransforms |