20.500.12556/RUL-129506 A homodyne quadrature laser interferometer for micro-asperity deformation analysis We report on the successful realization of a contactless, non-perturbing, displacement-measuring system for characterizing the surface roughness of polymer materials used in tribological applications. A single, time-dependent, scalar value, dubbed the collective micro-asperity deformation, is extracted from the normal-displacement measurements of normally loaded polymer samples. The displacement measurements with a sub-nanometer resolution are obtained with a homodyne quadrature laser interferometer. The measured collective micro-asperity deformation is critical for a determination of the real contact area and thus for the realistic contact conditions in tribological applications. The designed measuring system senses both the bulk creep as well as the micro-asperity creep occurring at the roughness peaks. The final results of our experimental measurements are three time-dependent values of the collective micro-asperity deformation for the three selected surface roughnesses. These values can be directly compared to theoretical deformation curves, which can be derived using existing real-contact-area models. polymers tribology micro-asperity deformation laser interferometry homodyne detection displacement real contact area roughness creep polimeri tribologija mikro vršički deformacija laserska interferometrija homodinska detekcija pomik true false true Angleški jezik Slovenski jezik Članek v reviji 2021-09-02 13:43:41 2021-09-02 13:43:42 2022-09-08 04:08:55 0000-00-00 00:00:00 2013 0 0 Str. 703-720 iss. 1 Vol. 13 2013 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539.92:531.715 1424-8220 10.3390/s130100703 12590619 RAZ_Pogacnik_Aljaz_2013.pdf RAZ_Pogacnik_Aljaz_2013.pdf 1 BDA6095B54CE553647D3C5BFBC9D9C08 b303fc1df938a7cce9df68907d12724802a9428457c4b49e9f501fa2f638d05d 325a7294-0be3-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=146493 https://www.mdpi.com/1424-8220/13/1/703 0 0ebc084c-0be3-11ec-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=146492 Fakulteta za strojništvo 0 0 0