To calculate the specularly reflected light distribution curve of fabrics a simplified model of the parallel arrangement of elliptical columns was used, and the calculated curves were compared with measurements. The following results are obtained:(1) The same tendency is found for the calculated specular reflection as for the measurement of fabrics.(2) A method is proposed to evaluate the quality and quantity of the gloss of fabrics.
This paper discusses the optical properties of the so-called Tamamu3 i Fabrics (iridescent fabrics) measured with a goniophotometer.The results obtained are:(1) The factors governing the optical properties of Tamamushi fabrics are considered to be the surface structure of the fabrics, fabric construction, gloss and combination of the colors of warp ends and filling yarns.(2) In order to analyse their optical properties, the reflected light from Tamamushi fabrics should be separated into the specular and the diffuse components.(3) The optical properties of warp ends and filling yarns have an important bearing on the iridescence of Tamamushi fabrics.(4) The color change of Tamamushi fabrics should be discussed from the goniophotometric reflection curves obtained under a monochromatic light resembling the warp ends and filling yarns in color.(5) The larger the hue difference between the warp ends and filling yarns, the larger the change of color on the chromatic diagram.
The term "gloss" is defined by dividing the reflected light distribution curve into two components; a specular and a diffuse reflection component. The ratio between two components is proposed.The results obtained are : 1) Shapes of diffusely reflected light distribution curves could be estimated by removing the specular component from reflected light distribution curves. The surface smoothness had a great effect on the shape of the diffusely reflected light distribution curves, resulting in increasing the deviation from the Lambert Law.2) Assuming the most simplified elliptical model, a diffusely reflected light distribution curve was examined, and it was confirmed that the smoothness of the model had a great effect on the deviation of reflected light distribution curve from the Lambert Law.
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.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.