Fringe Location By Means Of A Zero Crossing Algorithm

K. J. Gasvik; K. G. Robbersmyr; T. Vadseth

doi:10.1117/12.962782

20 November 1989 Fringe Location By Means Of A Zero Crossing Algorithm

K. J. Gasvik, K. G. Robbersmyr, T. Vadseth

Proceedings Volume 1163, Fringe Pattern Analysis; (1989) https://doi.org/10.1117/12.962782
Event: 33rd Annual Technical Symposium, 1989, San Diego, United States

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.

Citation Download Citation

K. J. Gasvik, K. G. Robbersmyr, and T. Vadseth "Fringe Location By Means Of A Zero Crossing Algorithm", Proc. SPIE 1163, Fringe Pattern Analysis, (20 November 1989); https://doi.org/10.1117/12.962782

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