Next Article in Journal
Performance Comparison of Two Sensors Based on Surface Plasmon Resonance in a Plastic Optical Fiber
Next Article in Special Issue
Low-Loss Hollow Waveguide Fibers for Mid-Infrared Quantum Cascade Laser Sensing Applications
Previous Article in Journal
Analysis of Detection Enhancement Using Microcantilevers with Long-Slit-Based Sensors
Previous Article in Special Issue
Absorption Measurements of Periodically Poled Potassium Titanyl Phosphate (PPKTP) at 775 nm and 1550 nm
Sensors 2013, 13(1), 703-720; doi:10.3390/s130100703
Article

A Homodyne Quadrature Laser Interferometer for Micro-Asperity Deformation Analysis

1
,
2
,
2
 and
2,*
1 Iskra Mehanizmi d.o.o., Lipnica 8, Kropa 4245, Slovenia 2 Faculty of Mechanical Engineering, University of Ljubljana, Aškerčeva 6, Ljubljana 1000, Slovenia
* Author to whom correspondence should be addressed.
Received: 31 October 2012 / Revised: 18 December 2012 / Accepted: 24 December 2012 / Published: 7 January 2013
(This article belongs to the Special Issue Laser Sensing and Imaging)
View Full-Text   |   Download PDF [490 KB, uploaded 21 June 2014]   |   Browse Figures
SciFeed

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 micro-asperity; deformation; real contact area; roughness; polymer; creep; tribology; laser interferometry; homodyne detection; displacement
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Share & Cite This Article

Further Mendeley | CiteULike
Export to BibTeX |
EndNote |
RIS
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.

View more citation formats

Related Articles

Article Metrics

For more information on the journal, click here

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert