Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis
A temporal wavelet analysis method is proposed for velocity, displacement, and three-dimensional surface-profile measurement of a continuously deforming object by use of the shadow moire´ technique. A grating is placed close to a deformin...
| 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/10356/92039 http://hdl.handle.net/10220/6472 |
| _version_ | 1811678987351490560 |
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| author | Tay, Cho Jui Quan, Chenggen Fu, Yu Huang, Yuanhao |
| author2 | Temasek Laboratories |
| author_facet | Temasek Laboratories Tay, Cho Jui Quan, Chenggen Fu, Yu Huang, Yuanhao |
| author_sort | Tay, Cho Jui |
| collection | NTU |
| description | A temporal wavelet analysis method is proposed for velocity, displacement, and three-dimensional
surface-profile measurement of a continuously deforming object by use of the shadow moire´ technique.
A grating is placed close to a deforming object, and its shadow is observed through the grating. The
moire´ fringe patterns, generated by the interference of the grating lines and their shadows, are captured
by a high-speed CCD camera with a telecentric gauging lens. Instantaneous frequency of gray-value
variation is evaluated point by point with the continuous wavelet transform. From the instantaneous
frequency of each point on the object, the velocity, displacement, and high-quality surface profile at
different instants can be retrieved. In this application, two specimens are tested to demonstrate the
validity of the proposed method: One is a small coin with a rigid body motion, and the other is a simply
supported beam subjected to a central point load. The results are compared with those obtained from
temporal Fourier-transform and mechanical stylus methods. |
| first_indexed | 2024-10-01T03:01:59Z |
| format | Journal Article |
| id | ntu-10356/92039 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:01:59Z |
| publishDate | 2010 |
| record_format | dspace |
| spelling | ntu-10356/920392020-09-26T22:16:42Z Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis Tay, Cho Jui Quan, Chenggen Fu, Yu Huang, Yuanhao Temasek Laboratories DRNTU::Science::Physics::Optics and light A temporal wavelet analysis method is proposed for velocity, displacement, and three-dimensional surface-profile measurement of a continuously deforming object by use of the shadow moire´ technique. A grating is placed close to a deforming object, and its shadow is observed through the grating. The moire´ fringe patterns, generated by the interference of the grating lines and their shadows, are captured by a high-speed CCD camera with a telecentric gauging lens. Instantaneous frequency of gray-value variation is evaluated point by point with the continuous wavelet transform. From the instantaneous frequency of each point on the object, the velocity, displacement, and high-quality surface profile at different instants can be retrieved. In this application, two specimens are tested to demonstrate the validity of the proposed method: One is a small coin with a rigid body motion, and the other is a simply supported beam subjected to a central point load. The results are compared with those obtained from temporal Fourier-transform and mechanical stylus methods. Published version 2010-11-23T08:51:51Z 2019-12-06T18:16:16Z 2010-11-23T08:51:51Z 2019-12-06T18:16:16Z 2004 2004 Journal Article Tay, C. J., Quan, C. G., Fu, Y., & Huang, Y. H. (2004). Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis. Applied Optics, 43(21), 4164-4171. 0003-6935 https://hdl.handle.net/10356/92039 http://hdl.handle.net/10220/6472 10.1364/AO.43.004164 en Applied Optics This paper was published in [Applied Optics] 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/ao/abstract.cfm?uri=ao-43-21-4164]. 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. 8 p. application/pdf |
| spellingShingle | DRNTU::Science::Physics::Optics and light Tay, Cho Jui Quan, Chenggen Fu, Yu Huang, Yuanhao Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title_full | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title_fullStr | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title_full_unstemmed | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title_short | Instantaneous velocity displacement and contour measurement by use of shadow moiré and temporal wavelet analysis |
| title_sort | instantaneous velocity displacement and contour measurement by use of shadow moire and temporal wavelet analysis |
| topic | DRNTU::Science::Physics::Optics and light |
| url | https://hdl.handle.net/10356/92039 http://hdl.handle.net/10220/6472 |
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