Many researchers are improving PIV (Particle Image Velocimetly) or PTV (Particle Tracking Velocimetry) techniques to obtain three-dimensional velocity vectors. Most of the techniques with some reliability, however, needs expensive equipments or advanced measurement technologies. Especially for PTV techniques, high technologies are necessary to calibrate two or more cameras.
In this paper, a technique to measure the three dimensional flow velocities with one camera are proposed to construct the instrumentation system with high practical use. The ideas of the spatial filter were combined with the laser sheet and acquire particle images using a high-speed video camera. The sampling speed of images might relate to the accuracy of measurement in this measurement method.
Uniform flow fields are measured to calibrate this method and ±10% accuracy is obtained. Flow around a Delta-Wing is measured and compared with the velocity measured by 5-hole pitot tube. Good agreement is obtained between them.