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In order to study individual fibres and their orientation in detail a PIV-based measurement stand was built, which is capable of analysing the flow and the fibre orientation in the suspension quasi-simultaneously. To measure the fibre orientation, black light can be switched on so that the fibres are stimulated by phosphorescence and become visible in the fluid. A random forest algorithm is used to detect the fibres in the images. This machine learning method allows the fibres to be accurately detected with little training data and a short training and processing time. The results show that there is a strong orientation effect on the fibres the closer they are to the orbit in the vicinity of the interfering body. In addition, a rapidly occurring orientation can be determined in detail. This allows the velocity vector fields and the actual fibre motion to be combined and analysed in this work.<\/jats:p>","DOI":"10.1038\/s41598-025-25656-3","type":"journal-article","created":{"date-parts":[[2025,11,7]],"date-time":"2025-11-07T08:49:00Z","timestamp":1762505340000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Advanced optical measurement techniques for simultaneous fibre orientation and flow analysis complemented by machine learning"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-9193-4424","authenticated-orcid":false,"given":"Tim","family":"Vaupel","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Florian","family":"Gerland","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Schomberg","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Olaf","family":"W\u00fcnsch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,11,7]]},"reference":[{"key":"25656_CR1","doi-asserted-by":"crossref","unstructured":"Hoseini, A. 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