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Proceedings Paper

Speckle correlation used for measuring microstructural changes in paper
Author(s): Mikael Sjodahl; Linda Larsson
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Paper Abstract

In this paper the use of laser speckle correlation as a mean to measure the micro-structural changes in paper exposed to a changing environment will be presented. Of particular interest will be changes in humidity and crack propagation. Speckle correlation is a technique that calculates the local structural change in a speckle pattern as the object deforms in real time. The response of the technique is the local rate of micro-structural change in the material. Speckle correlation is hence a complement to other speckle metrology techniques. The paper starts with a short introduction to speckle correlation but will focus on applications of the technique on paper. Results from studies of wetting of printing paper at the flock scale, dynamic response in copy paper when exposed to a sudden change in humidity and crack propagation in a notched sheet of Kraftliner are included.

Paper Details

Date Published: 27 May 2003
PDF: 6 pages
Proc. SPIE 4933, Speckle Metrology 2003, (27 May 2003); doi: 10.1117/12.516572
Show Author Affiliations
Mikael Sjodahl, Lulea Univ. of Tehnology (Sweden)
Linda Larsson, Lulea Univ. of Tehnology (Sweden)


Published in SPIE Proceedings Vol. 4933:
Speckle Metrology 2003
Kay Gastinger; Ole Johan Lokberg; Svein Winther, Editor(s)

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