Anisotropic Light Transmission Properties of Plain Woven Fabrics

Abstract

Light transmission property of plain woven fabrics was studied in order to perform the fabric design considering the transmission. A light transmission measurement apparatus which could change incidence and receiving direction of light was developed and the change of the transmission factor by light direction was measured for plain woven fabrics. Because structures of the fabrics are anisotropy, the light transmission property showed anisotropy. The anisotropy of transmission factor was remarkable in large incidence angle, and the minimum or maximum values were showed every /4 cycle. An approximation curve of anisotropy was proposed and the anisotropic light transmission factor was estimated from a measurement at front of a fabric and structure of the fabric based on crimp theory of Peirce.(Received 9 December, 2003; Accepted 1 July, 2004)[4][5][6] [7] [8] 4 '

Transmission of ultraviolet light through reinforcement fabrics and its effect on ultraviolet curing of composite laminates

“…If the polar angle is different from 08, the azimuth angle has a significant influence on the transmission, which increases with increasing value of u. The reported experimental results [8] indicate that the transmission has maxima if the direction of incidence is parallel to one of the main fiber directions. The position of the minima in terms of the angle h depends on the fiber spacing along the fabric weft and warp directions and the resulting geometry of the voids between the fiber bundles.…”

“…However, in realistic UV curing applications, the irradiation may be non-normal. Non-normal transmission through fabrics was experimentally investigated by Yazaki et al [8] for the example of a plain weave fabric. In this general case, the direction of inci- dence is described by the polar angle u and the azimuth angle h. Because of the rotation of the fabric relative to the direction of incident light, the effective thickness h eff along the direction of incidence and the effective area A eff normal to the direction of incidence would be changed.…”

“…The influence of wetting on the effective transmission (increase/decrease) was found to depend on the type of fabric. Regarding the effect of the fabric structure, Yazaki et al [8] studied the directionality of light transmission for a plain weave fabric at different angles of incidence. The main finding was that the transmission is strongly correlated to the direction of incidence relative to the main fabric orientations.…”

Van Der Pauw method for measuring resistivities of anisotropic layers printed on textile substrates

“…The resulting values of V DC /I AB and V BC /I AD are listed in Table 2. By using (11) the value of a can be calculated.…”

About the collinear four-point probe technique´s inability to measure the resistivity of anisotropic electroconductive fabrics

“…11 Anisotropic phenomena in textiles have been reported in several papers but limited to mechanical and optical properties. 14–20 Only a single paper related to anisotropic electric properties was found. 21…”