Abstract
Recently, we reported two novel experimental techniques for the determination of elastohydrodynamic lubricant film thickness and shape in model contacts based on colorimetric interferometry. This approach successfully overcomes two major limitations of conventional optical interferometry – accuracy and resolution. This paper presents the next stage in the development of these two techniques. The use of spacer layer has enabled to extend the film thickness measurement range down to several nanometers so that the relationship between the central and minimum film thickness and rolling speed in the very thin film thickness regime could be studied. The measurement techniques also produced information about film thickness profiles across lubricated contact and three-dimensional maps of film thickness.
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