低コヒーレンス位相シフト干渉法を用いたナノ潤滑膜の三次元画像計測(機械要素,潤滑,工作,生産管理など)

概要

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We have developed a method utilizing low-coherence phase-shifting interferometry (LCPSI) to directly visualize molecularly thin lubricant films coated on diamond-like carbon (DLC) surfaces. In contrast to conventional point-by-point scanning methods, this method straightforwardly measures lubricant distributions in three dimensions using phase-shifted two-dimensional interferograms which are generated by a Michelson interferometer and a robust feedback controlled phase-shifting system. To effectively suppress the image noise caused by unwanted interference, we employed a low-coherence light source rather than a laser. Moreover, an image subtraction method, in which the pseudo lubricant thickness attributed to surface roughness and system noise is first measured on a non-lubricated disk and is then subtracted from the result obtained on the lubricated disk, was introduced to eliminate the influence of surface roughness and system noise. By measuring nanometer-thick perfluoropolyether films coated on DLC surfaces, we demonstrated that the LCPSI is capable of providing real-time three-dimensional measurements with a thickness resolution of sub-nanometer and a spatial resolution of several micrometers.
社団法人日本機械学会の論文
2007-06-25