Abstract
A new simultaneous measurement method of temperature and thickness for lubricating oil film was proposed. In this method, two fluorescent dyes with different fluorescent spectrum and temperature characteristics were dissolved in oil and excited by same laser light. The temperature was obtained by the intensity ratio of fluorescence and the oil film thickness was obtained by the intensity of fluorescence. The 488 nm light of Ar Laser was used as a light source. From the experiments, Coumarin 6 and DCM were selected as appropriate fluorescent dye for this method. The fluorescence from Coumarin 6 in PAO increases with temperature and that from DCM in PAO decreases with temperature, and the intensity ratio of each dye changes greatly with temperature. It was confirmed that, by using the combination of Coumarin 6 and DCM with PAO, this method can he applied to measure the temperature and thickness of oil film in the temperature range from 60°C to 140°C.
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