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Proceedings Paper

Fringe Location By Means Of A Zero Crossing Algorithm
Author(s): K. J. Gasvik; K. G. Robbersmyr; T. Vadseth
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Paper Abstract

Moire technique using projected fringes is a suitable method for full field measurements of out-of plane deformations and object contouring. In many applications however, the sensitivity of the method is often too low. To overcome this problem, one solution is to apply interpolation tech-niques by means of precise location of the fringe maxima. In this paper we present a method of fringe location by means of a zero crossing algorithm. The system is based on a digital image processing module plugged into a PC/AT using a CCD camera as the imaging sensor. In this way, the positions of the maxima are located with an accuracy of a fraction of one pixel width.

Paper Details

Date Published: 20 November 1989
PDF: 7 pages
Proc. SPIE 1163, Fringe Pattern Analysis, (20 November 1989); doi: 10.1117/12.962782
Show Author Affiliations
K. J. Gasvik, SINTEF and The University of Trondheim (Norway)
K. G. Robbersmyr, SINTEF and The University of Trondheim (Norway)
T. Vadseth, SINTEF and The University of Trondheim (Norway)

Published in SPIE Proceedings Vol. 1163:
Fringe Pattern Analysis
Graeme T. Reid, Editor(s)

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