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3D-3C speckle interferometry: Optical device for measuring complex structures
| Content Provider | Semantic Scholar |
|---|---|
| Author | Goudemand, Nicolas |
| Copyright Year | 2005 |
| Abstract | We use here the term of 3D-3C specklo interferornetry to refer to the application of speckle interferometry for the measurement, on three-dimensional surfaces, of the thrce components of the thrce-dimensional displacement field. The goal of this work was to develop a specklc interferornetric rneasurement device for investigating the deformation behavior of complex shaped structures made of innovative materials. This development implied a theorctieal analysis of speckle interferometry applied to three-dimensional hardly eurved surfaces, the design of speeific measurernent equipmcnt and the implementation of original irnage proeessing and ealibration routines. A thorough error analysis of the whole measuring schemc was pcrformed, which put into relief the necessity of a proeise calibration of the set-up geornetry and apreeise mapping of the measuring space, including a modelization of the imaging process and a measuremcnt of the three-dimcnsional shape of the analyzed surface, The loeal variation of the sensitivity vector (which relates the measured phase differenee to the wanted displacement) can thus be taken into consideration very accurately, It was also recognized that dcfoeusing errors could affeet the measurement results, sinee the displacement field given by the standard equation corrcsponds to the displacements of the specklos in the focused plane and not necessarily to the surface displacements. It is consequently adviscd to find a compromiso for the speckle dimension, i. c. for the numerical apertute of the carnera. An all-fiber set-up was developed, which allows both the rneasurement of the |
| File Format | PDF HTM / HTML |
| DOI | 10.3929/ethz-a-005011210 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/99772/eth-27996-01.pdf;jsessionid=6399345ABCB3BEB44E0CC85077E7B7DC?sequence=1 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/99772/eth-27996-01.pdf;jsessionid=1B100BDE882E6FB51000F3A08DA3EDA2?sequence=1 |
| Alternate Webpage(s) | https://www.research-collection.ethz.ch/bitstream/handle/20.500.11850/99772/eth-27996-01.pdf?isAllowed=y&sequence=1 |
| Alternate Webpage(s) | https://doi.org/10.3929/ethz-a-005011210 |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
