抄録
A fluorescence image diagnostic method in which a filtered Xe-flash lamp and a video camera are used has been developed to observe the distribution and behavior of oil film on a piston surface in detail. A light source with appropriate spectrum characteristics for measurement of the thickness of thin oil films was employed after theoretical consideration of the absorption spectrum of the fluorescent dye and the oil with the fluorescent dye. A simple correction for measurement results obtained for a curved surface and calibration were carried out. The use of this system ensures that the distribution and behavior of oil film on the piston skirt and piston rings can be quantitatively measured, and the system is shown to have practical applications.
