DETERMINATION OF THE ASPECT RATIO OF A SPHEROIDAL PARTICLE BY STEREO OBSERVATION

A geometrical analysis is presented for the aspect ratio determination of a spheroidal particle by stereo observation. Orthogonal projection s of particle shape are obtained from images in electron micrographs. The aspect ratio of the spheroidal particle is expressed as a function of the changes in the shape and direction of the projected images cau sed by tilting. Although two different values of the aspect ratio are generally obtained from a pair of stereo micrographs, the ambiguity ca n be avoided if the particle is observed from three different directio ns. As an example, the results obtained are applied to the analysis fo r the shape change of liquid B2O3 particles induced by plastic deforma tion of a Cu matrix.