Sensors 2013, 13(1), 703-720; doi:10.3390/s130100703
Article

A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis

Received: 31 October 2012; in revised form: 18 December 2012 / Accepted: 24 December 2012 / Published: 7 January 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract: 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.
Keywords: micro-asperity; deformation; real contact area; roughness; polymer; creep; tribology; laser interferometry; homodyne detection; displacement
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MDPI and ACS Style

Pogačnik, A.; Požar, T.; Kalin, M.; Možina, J. A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis. Sensors 2013, 13, 703-720.

AMA Style

Pogačnik A, Požar T, Kalin M, Možina J. A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis. Sensors. 2013; 13(1):703-720.

Chicago/Turabian Style

Pogačnik, Aljaž; Požar, Tomaž; Kalin, Mitjan; Možina, Janez. 2013. "A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis." Sensors 13, no. 1: 703-720.

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