Published date: Aug 10 2022

Journal Title: KnE Materials Science

Issue title: 1st International FibEnTech Congress (FibEnTech21) – New Opportunities for Fibrous Materials in the Ecological Transition

Pages: 15–24

DOI: 10.18502/kms.v7i1.11604

Francisca SilvaUniversity of Beira Interior, Covilhã, Portugal

Paulo FiadeiroFiber Materials and Environmental Technologies (FibEnTech-UBI) and University of Beira Interior, Covilhã, Portugal

Elsa Fonsecaefonseca@ubi.ptFiber Materials and Environmental Technologies (FibEnTech-UBI) and University of Beira Interior, Covilhã, Portugal

Studying the three-dimensional structure of paper fibrous networks is an important step towards understanding the relationship between manufacturing conditions and the resulting microstructural and mechanical properties. Digital holography is a promising three-dimensional imaging technique enabling quantitative phase evaluation of micro and nano-fibres. One of the advantages of this high-resolution method is the ability to perform numerical refocusing at several depths from a single shot acquisition. In this work, the suitability of 22 focusing functions to accurately identify the positions of cellulose microfibers, using digital holography, was inspected. The best performing metrics were identified and the trade-off between metric accuracy and robustness to variable conditions and their computational complexity were discussed.

Keywords: digital holography, autofocus, cellulose microfibre, morphology, tomography

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