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Proceedings Paper

Pseudo spackle pattern photography algorithm development and experimental calibration
Author(s): Shan Fu; Phil E. Irving; Domenico Furfari
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Paper Abstract

The measurement of in-plane surface strain is very important in structural material research. The traditional strain measurement techniques, however, have their clear constaint and inconveniency in terms of both sensor system arrangement and data analysis. This paper presents the development of a novel technique for estimating the local surface strain over a region. The key element of the technique is a high accurate image displacement detection algorithm. This algorithm is based on the Optical Flow concept and implemented in a multi-scale analysis scheme. This technique is aiming at covering large viewing area and detecting small deformation components on the top of large translation with high accuracy. A numerical differentiation procedure is also discussed to derive strain field from the displacement field. The test procedure of this technique is also presented in this paper. The test procedure consists of absolute translation calibration and strain calibration against strain-gauge measurement. The experimental results show a very good agreement between the proposed technique and the well-established traditional measurement.

Paper Details

Date Published: 29 April 2003
PDF: 7 pages
Proc. SPIE 5058, Optical Technology and Image Processing for Fluids and Solids Diagnostics 2002, (29 April 2003); doi: 10.1117/12.509763
Show Author Affiliations
Shan Fu, Cranfield Univ. (United Kingdom)
Phil E. Irving, Cranfield Univ. (United Kingdom)
Domenico Furfari, Cranfield Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 5058:
Optical Technology and Image Processing for Fluids and Solids Diagnostics 2002
Gong Xin Shen; Soyoung S. Cha; Fu-Pen Chiang; Carolyn R. Mercer, Editor(s)

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