Single-axis combined shearography and digital speckle photography instrument for full surface strain characterization
| dc.contributor.author | Groves, Roger M. | - |
| dc.contributor.author | Fu, S. | - |
| dc.contributor.author | James, Stephen W. | - |
| dc.contributor.author | Tatam, Ralph P. | - |
| dc.date.accessioned | 2011-07-25T23:07:59Z | |
| dc.date.available | 2011-07-25T23:07:59Z | |
| dc.date.issued | 2005-02-28T00:00:00Z | - |
| dc.description.abstract | Full characterization of the surface strain requires the measurement of six displacement gradient components of the surface strain tensor. The out-of-plane displacement gradient component may be directly measured using the full-field speckle interferometry technique of shearography, but to fully characterize the surface strain using shearography, a minimum of three illumination, or viewing, directions are required. The image processing technique of digital speckle photography (DSP) is sensitive to in-plane displacement for normal collinear illumination and viewing, with the displacement gradient components obtained by differentiation. A combination of shearography and digital speckle photography is used to perform full characterization of the surface strain using a single illumination and viewing direction. The increase in complexity compared with a standard single-channel shearography system lies predominantly in the additional image processing requirements. Digital speckle photography image processing is performed using the optical flow field technique and the advantages of this technique compared with correlation are discussed. The design of the instrument is described and full surface strain measurements made with the system are presented. | en_UK |
| dc.identifier.citation | R.M. Groves, S. Fu, S.W. James, R.P. Tatam, Single-axis combined shearography and digital speckle photography instrument for full surface strain characterization, Optical Engineering, Volume 44(2) Pages 025602-1-025602-6, 2004. | |
| dc.identifier.issn | 0091-3286 | - |
| dc.identifier.uri | http://dx.doi.org/10.1117/1.1842779 | - |
| dc.identifier.uri | http://dspace.lib.cranfield.ac.uk/handle/1826/5720 | |
| dc.language.iso | en_UK | en_UK |
| dc.publisher | Spie -- the Int Soc for Optical Engineering | en_UK |
| dc.rights | Copyright 2005 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. | |
| dc.subject | strain measurement limited optical access shearography digital speckle photography field-measurements image-correlation displacement interferometry algorithm | en_UK |
| dc.title | Single-axis combined shearography and digital speckle photography instrument for full surface strain characterization | en_UK |
| dc.type | Article | en_UK |
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