Monitoring moisture distribution in textile materials using grating interferometry and ptychographic X-ray imaging. Issue 1 (January 2015)

• Record Type: Journal Article
• Authors: Esmaeili, Morteza; Fløystad, Jostein B; Hipp, Alexander; Willner, Marian; Bech, Martin; Diaz, Ana; Røyset, Arne; Andreasen, Jens W; Pfeiffer, Franz; Breiby, Dag W
• Is Part Of: Textile research journal. Volume 85:Issue 1(2015)
• Page Start: 80
• Page End: 90
• Publication Date: 2015-01
• Subjects: ptychography -- talbot imaging -- coherent scattering -- tomography -- textiles -- wool -- cotton; Textile industry -- Periodicals; Textile fabrics -- Periodicals; Textile research -- Periodicals; Textiles et tissus -- Industrie et commerce -- Périodiques; Textiles et tissus -- Périodiques; Textiles et tissus -- Recherche -- Périodiques; Electronic journals; 677.005
• DOI: 10.1177/0040517514538693
• Languages: English
• ISSNs: 0040-5175

Abstract

Employing two recently developed X-ray imaging techniques, we investigated methods for observing moisture at different length scales in organic fibers and textiles. Using the coherent diffractive imaging technique of ptychographic tomography, structural features in a single coated wool fiber in both dry and humid conditions were observed at about 200 nm resolution. The reconstructed three-dimensional images yield quantitative information about the spatial density distribution in the fiber, showing that the fiber swells laterally by 8–9% in humid conditions. We further explore the applicability of grating interferometry, also known as Talbot imaging, for studying humidity transport in woven cotton, with a resolution on the order of 100 µm and a field of view of a few square centimeters. Grating interferometry inherently gives access to three complementary imaging modalities, namely absorption-, phase- and dark-field contrast, and we demonstrate that all of them are valuable and provide complementary information for the purpose of monitoring moisture in textiles.