抄録
It is very important for the machine under operation to know oil film thickness. If fluorescent agent is dissolved in oil, oil film thickness is measurable by fluorescence intensity. 2, 5-Bis (5-tert-butyl-2-benzoxazoyl) thiophene was selected as fluorescent agent, and it dissolved in PAO (Polyalphaolefin). To know fluorescent property of fluorescent agent, fluorescent spectrometric analyzer was used. The 475nm light of ultraviolet was used as a light source. Oil film thickness was measured by getting to know the intensity of fluorescence exited by ultraviolet light. It is thought that fluorescence intensity is subjected to influence the substance of ground on which the oil containing a fluorescent agent is placed. The examinations which investigate the relation between fluorescence intensity and oil film thickness were done also on engineering plastic with until now few example of measurement. As a result, it turned out that it is affected in the fluorescence characteristic and color of the substance of ground which places the oil containing a fluorescent agent.
