抄録
A new measurement technique of liquid film thickness, such as oil film thickness, proposed by one of the authors, was developed in this study. In this technique, a fluorescent dye was dissolved in the liquid film and excited by a laser light of Nd-YAG Laser. The light beam with spectrum corresponding to a liquid film thickness was emitted perpendicular to the liquid film by stimulated emission of radiation. Through the systematic experiments, it is confirmed that the dispersion angle of the light beam is around 30 degrees which allows the optical sensor system can be set easily.
