Removing the image-doubling in shearography by reconstruction of the displacement field
| Autor: | Stephan Waldner |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Physics
business.industry Strain measurement Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Interferometry Speckle pattern Optics Shearography Fringe pattern Displacement field Measuring instrument Electrical and Electronic Engineering Physical and Theoretical Chemistry Shearing interferometer business |
| Zdroj: | Optics Communications. 127:117-126 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/0030-4018(96)00109-5 |
| Popis: | In shearography a doubled speckle pattern is used to measure an approximation to the displacement derivative of a deformed object. In this paper a method is presented that reconstructs the original displacement field from a shearographic recording. The phase value representing the displacement of a point is calculated by adding the phase values of certain points in the shearogram. Applying this summation to all image points results in a fringe pattern that represents the displacement field with the effect of shear distance (i.e. the image-doubling) removed. Experiments performed with a simulated as well as with a measured shearogram show that the theoretically derived method works in practice. Since a shearography set-up with a single illuminating beam is used for recording and the result of the subsequent procedure is a displacement field, this method could be considered the realization of a single-beam electronic speckle pattern interferometer. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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