A LASER INTERFEROMETRIC MEASUREMENT OF THE TEMPERATURE DISTRIBUTION IN CONVECTIVE THERMAL TRANSFER BOUNDARY LAYERS

By means of a double mirror interferometry a two-dimensional temperature distributionmeasurement in convective thermal boundary layers is presented. When the cold air flows along a hot plate model,the interferometric fringe inside the boundary layer will bend. According to the displacement of the fringe andthe relation between temperature and index of refraction, a two-dimensional temperature profile is obtained.All is accomplished by optical device with the help of micro-computer without any contact with theflow field.