K. Kawasue et T. Ishimatsu, 3-D MEASUREMENT OF MOVING PARTICLES BY CIRCULAR IMAGE SHIFTING, IEEE transactions on industrial electronics, 44(5), 1997, pp. 703-706
A new approach to the three-dimensional (3-D) measurement of position
and velocity of moving particles is introduced, A single TV camera wit
h an apparatus to add circular shift to the image enables us to record
the 3-D movement of particles as spiral streaks on a single image, Ev
ery shape of the spiral streak on the image plane is related to the po
sition and the velocity of the individual particle, The information ab
out 3-D movement of particles is extracted from the image using an ima
ge processing technique, We applied the technique to the measurement o
f the 3-D water-flow field seeded with tracer particles in a test tank
and obtained satisfactory results.