Computer Simulation of Goniophotometric Curves for Fabrics

Abstract

Author have previously reported that the distribution of a specular reflected light, i.e., goniophotometric curve, on fabrics can be simulated by assuming the warp yarn to be a simple elliptic column. Experimental results agreed well with these calculated curves. It is desirable, however, to use a model more closer to the real fabrics, since the surface of fabrics is very complicated.Simulated goniophotometric curves were obtained in a computer simulation using a new thread model, in which a parallel light flux was assumed to be projected to the fabrics. The new thread model consists of many fine elliptic cylinders arranged side by side covering the entire surface of a large elliptic column. In this computer simulation, the axis of incident light flux and photodetector was assumed to lie on a plane perpendicular to the warp ends of fabrics. This new simulation method can find wider use than that of the previous paper.

Computer Simulation of Goniophotometric Curves for Fabrics

“…3. [2] In the model shown in Fig. 3 the photometry plane formed by the axes of incident and received light is either perpendicular or parallel to the filament axis as far as twodimensional photometry is assumed.…”