The development and application of the spacer layer imaging method for measuring lubricant film thickness
- 1 March 2001
- journal article
- research article
- Published by SAGE Publications in Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology
- Vol. 215 (3), 261-277
- https://doi.org/10.1243/1350650011543529
Abstract
This paper reviews the historical development of optical interferometry as applied to the study of lubricant films. The technique was first applied to lubricated contacts in the 1960s, when it played an important role in the validation of the elastohydrodynamic theory of lubrication. Initially the method was not suited to the study of mixed and boundary lubrication because it could not measure film thicknesses of less than about 50 nm. In the 1970s, however, this limitation was partially overcome by the use of a spacer layer and this, coupled in the early 1990s with spectrometric analysis of the interfered light, enabled films down to just 1 nm thick to be measured in lubricated contacts, well within the boundary lubrication regime. Recently a number of workers have applied colorimetric image analysis to optical interference images to enable accurate three-dimensional maps of film distribution in lubricated contacts to be determined. This approach, coupled with the use of a spacer layer, has led to the spacer layer imaging method, which can map film thickness in boundary and mixed lubricated contact. Some recent applications of this technique are described.Keywords
This publication has 42 references indexed in Scilit:
- Lubricant Film Thickness in Rough Surface, Mixed Elastohydrodynamic ContactJournal of Tribology, 1999
- A Hybrid Film Thickness Evaluation Scheme Based on Multi-Channel Interferometry and Contact MechanicsJournal of Tribology, 1999
- Film Thickness in Starved EHL Point ContactsJournal of Tribology, 1998
- Central and Minimum Elastohydrodynamic Film Thickness at High Contact PressureJournal of Tribology, 1997
- The Development of a Spacer Layer Imaging Method (SLIM) for Mapping Elastohydrodynamic ContactsTribology Transactions, 1996
- Measurement of the Density of Base Fluids at Pressures to 2.20 GPaA S L E Transactions, 1987
- An Optical Study of the Lubrication of a 65 mm Cylindrical Roller BearingJournal of Lubrication Technology, 1979
- Optical Analysis of Porous Metal BearingsJournal of Lubrication Technology, 1979
- Oil Film Thickness and Rolling Friction in Elastohydrodynamic Point ContactJournal of Lubrication Technology, 1971
- Fluid Rheological Effects in Sliding Elastohydrodynamic Point Contacts With Transient Loading: 1—Film ThicknessJournal of Lubrication Technology, 1971