Characteristics of the falling-particles velocity in the air with image analysis

This paper describes the characteristics of the falling particles velocity in the air with the image analysis. Glass beads in a mean diameter 200 micrometers were dropped from an exit of a small nozzle. An application of a new image analysis such as a spatial filtering method based on dynamic image processing with a sequential image data obtained by a high speed video system was carried out. A specified frequency was obtained by the spectrum analysis with the reduced signals. Once a specified frequency was reached, we could calculate the velocity of a particle using the following equation, Vo equals f X (lambda) . These values were compared with the other values obtained by the optical fiber sensor method which was dual light source/receiver type sensor. Consequently, there were slight differences between them.