Sensors | |
A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis | |
Aljaž PogaČnik1  Tomaž Por2  Mitjan Kalin2  | |
[1] Iskra Mehanizmi d.o.o., Lipnica 8, Kropa 4245, Slovenia; E-Mail:;Faculty of Mechanical Engineering, University of Ljubljana, AškerČeva 6, Ljubljana 1000, Slovenia; E-Mails: | |
关键词: micro-asperity; deformation; real contact area; roughness; polymer; creep; tribology; laser interferometry; homodyne detection; displacement; | |
DOI : 10.3390/s130100703 | |
来源: mdpi | |
【 摘 要 】
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.
【 授权许可】
CC BY
© 2013 by the authors; licensee MDPI, Basel, Switzerland.
【 预 览 】
Files | Size | Format | View |
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RO202003190039297ZK.pdf | 490KB | download |