직물의 세부 구조 및 굴곡이 웨어러블 섬유의 발광 효과에 미치는 영향

Abstract

The two main requirements of wearable optical fiber fabrics are that they must presuppose a high degree of flexibility and they must maintain the luminance effect in both flat and bent conformations. Therefore, woven optical fiber fabrics that satisfy the above conditions were developed by both weaving and by using computer embroidery. First, we measured the brightness of the wearable optical fiber fabric in the flat state at a total of 10 measurement points at intervals of 1 ㎝. Second, the wearable optical fiber fabric was placed horizontally on the forearm, where three-dimensional bending occurs, and the luminance values were recorded at the same 10 measurement points. For the woven fabric in the flat state, the maximum, minimum, average, and standard deviation luminance values were 5.23 cd/㎡, 2.74 cd/㎡, 3.56 cd/㎡, and 1.11 cd/㎡, respectively. The corresponding luminance values from the bent forearm were 7.92 cd/㎡ (maximum), 2.37 cd/㎡ (minimum), 4.42 cd/㎡ (average), and 2.16 cd/㎡ (standard deviation). In the case of the computer-embroidered fabric, the maximum, minimum, average, and standard deviation luminance values in the flat state were 7.56 cd/㎡, 3.84 cd/ ㎡, 5.13 cd/ ㎡, and 1.04 cd/㎡, respectively, and in the bent forearm state were 9.6 cd/㎡, 3.63 cd/㎡, 6.13 cd/ ㎡, and 2.26 cd/㎡, respectively. Therefore, the computer-embroidered fabric exhibited a higher luminous effect than the woven fabric because the detailed structure reduced light-loss due to the backside fabric. In both types of wearable optical fiber fabric the luminance at the forearm was 124% and 119%, respectively, and the light emitting effect of the optical fiber fabric was maintained even when bent by the human body. This is consistent with the principle of Huygens, which defines the wave theory of light, and also the Huygens-Fresnel- Kirchhoff principle, which states that the intensity of light increases according to the magnitude of the angle of propagation of the light wavefront (θ).