Iskra Mehanizmi doo, Lipnica 8, Kropa 4245, Slovenia.
Sensors (Basel). 2013 Jan 7;13(1):703-20. doi: 10.3390/s130100703.
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.
我们成功实现了一种用于测量用于摩擦学应用的聚合物材料表面粗糙度的非接触、无干扰的位移测量系统。从正常加载聚合物样品的法向位移测量中提取出一个单一的、随时间变化的标量值，称为集体微凸体变形。具有亚纳米分辨率的位移测量是通过同相正交激光干涉仪获得的。所测量的集体微凸体变形对于确定真实接触面积以及因此对于摩擦学应用中的实际接触条件至关重要。设计的测量系统可以同时感知体蠕变和粗糙度峰处的微凸体蠕变。我们实验测量的最终结果是三个选定表面粗糙度的集体微凸体变形的三个时变值。这些值可以直接与理论变形曲线进行比较，这些曲线可以使用现有的真实接触面积模型推导出来。
