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Optical characterization of elastohydrodynamic lubricated (EHL) contacts using surface plasmon resonance (SPR) effect |
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| Authors: | CL Wong HP Ho KS Chan PL Wong SY Wu Chinlon Lin |
| Affiliation: | a Centre for Advanced Research in Photonics, The Chinese University of Hong Kong, NT, Hong Kong SAR, China b Department of Electronic Engineering, The Chinese University of Hong Kong, Hong Kong, China c Department of Physics and Materials Science, The City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China d Department of Manufacturing Engineering and Engineering Management, The City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China |
| Abstract: | In this paper we report a novel optical technique based on the surface plasmon resonance (SPR) phenomenon for studying elastohydrodynamic lubricated (EHL) dimple. While it is well known that the refractive index (RI) variation in the lubricant may provide direct information on the pressure distribution inside a highly pressurized EHL dimple, one can obtain the pressure in the spectral SPR absorption curve, which corresponds to a unique color complexion in the SPR image.We have performed experiments to compare our SPR imaging technique with the one based on conventional optical interferometry. The new SPR technique provides an improvement of over 180 times in measurement accuracy. More importantly, SPR measures the RI directly and does not require any information on the lubricant film thickness. In light of these advantages, the SPR detection approach reported herein should be an attractive technique for studying EHL contacts. |
| Keywords: | Surface plasmon resonance SPR imaging EHL Optical interferometry Refractive index Liquid lubricant |
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