抄録
The flow visualization inside the oil film was tried using the method of photochromism. One of the photochromic dyes is dissolved in the PAO and used as a test solution for examining the coloring characteristics and flow visualization. From the systematic experiments, it is confirmed that the spyropyran is a good candidate for photochromic dye under the ambient condition of relatively low temperature range around the room temperature with its long life time of coloring and with its clear color. On the contrary, CMTE is a good candidate for photochromic dye for the usage in the higher temperature range with its longer life time of coloring under the high temperature. In the visualization experiments using the light source of a 3rd harmonic of Nd-YAG laser and the CCD camera, the movement of the oil film with the thickness of 30 nm was successfully visualized and the flow velocity was quantified.
