PARTICLE-SIZE ANALYSIS OF DISPERSE DYE-SYSTEM .1. FUNDAMENTALS OF THE PARTICLE-SIZE ANALYSIS BY PHOTON-CORRELATION-SPECTROSCOPY

One constitutive property for the description of dyeing polyester‐materials with disperse dyes is the particle size distribution in the dye bath. To measure particle sizes below one micrometer in situ, special techniques are required. One of these is the so called photon‐correlation‐spectroscopy, depending on the scattering of laser light by suspended small particles in a fluid. The mathematical and physical principles of the photon‐correlation‐technique are explained in this article.