A homodyne quadrature laser interferometer for micro-asperity deformation analysis

Pogačnik, Aljaž (author), Požar, Tomaž (author), Kalin, Mitjan (author), Možina, Janez (author)

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.

• Language: English
• Keywords: polymers, tribology, micro-asperity, deformation, laser interferometry, homodyne detection, displacement, real contact area, roughness, creep
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2013
• Number of pages: Str. 703-720
• Numbering: Vol. 13, iss. 1
• PID: 20.500.12556/RUL-129506
• UDC: 539.92:531.715
• ISSN on article: 1424-8220
• DOI: 10.3390/s130100703
• COBISS.SI-ID: 12590619
• Publication date in RUL: 02.09.2021

POGAČNIK, Aljaž, POŽAR, Tomaž, KALIN, Mitjan and MOŽINA, Janez, 2013, A homodyne quadrature laser interferometer for micro-asperity deformation analysis. Sensors [online]. 2013. Vol. 13, no. 1, p. 703–720. [Accessed 26 April 2025]. DOI 10.3390/s130100703. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=129506

Record is a part of a journal

• Title: Sensors
• Shortened title: Sensors
• Publisher: MDPI
• ISSN: 1424-8220
• COBISS.SI-ID: 10176278

Licences

• License: CC BY 3.0, Creative Commons Attribution 3.0 Unported
• Link: https://creativecommons.org/licenses/by/3.0/deed.en
• Description: You are free to reproduce and redistribute the material in any medium or format. You are free to remix, transform, and build upon the material for any purpose, even commercially. You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.
• Licensing start date: 07.01.2013

Secondary language

• Language: Slovenian
• Keywords: polimeri, tribologija, mikro vršički, deformacija, laserska interferometrija, homodinska detekcija, pomik

Projects

• Funder: EC - European Commission
• Funding programme: European Social Fund