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Proceedings Paper

Digital speckle techniques applied to industrial precision measurements
Author(s): Roberto Daniel Torroba
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Paper Abstract

Digital speckle pattern interferometry (DSPI) is used to produce a fringe pattern representing speckle correlation changes. This fringe pattern has the same interpretation as that obtained with holographic interferometry. Remarkable features of this technique are the possibilities of real- time processing and software treatment. Due to these characteristics, DSPI becomes an attractive option to the non-destructive testing an evaluation. Through different analysis of the fringes, it is possible to get quantitative information about the correlation changes that gave rise to the pattern. We are going to introduce three alternatives of digital speckle to precision measurements: focal length (fringe positional changes), angle measurements (fringe visibility changes), and topography (digital fringe generation by moire). Theoretical demonstrations will be outlined and experimental results will be presented.

Paper Details

Date Published: 6 July 1999
PDF: 9 pages
Proc. SPIE 3572, 3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications, (6 July 1999); doi: 10.1117/12.358364
Show Author Affiliations
Roberto Daniel Torroba, Ctr. de Investigationes Opticas and Univ. Nacional de La Plata (Argentina)


Published in SPIE Proceedings Vol. 3572:
3rd Iberoamerican Optics Meeting and 6th Latin American Meeting on Optics, Lasers, and Their Applications
Angela Maria Guzman, Editor(s)

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