By analysing the testing principle of two dimensional particle motion and applying the technology of high speed narrow gap scanning photography, a new testing system is established. This system can acquire the locus and velocity of two dimensional particle motion. Thus the new testing system widens the studying field of high speed narrow gap scanning photography from one dimension to two dimension. The author compares two kinds of testing systems and gets the photographs of body movement by using new testing system. Particle motion is studied under high pressure. At ...
