Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 136-140.doi: 10.13475/j.fzxb.20180700205

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Equivalent luminance of children nocturnal safety garments

YAN Yanhong1,2(), WANG Laili2, GU Bingfei2   

  1. 1. Zhejiang Textile and Clothing Technology Co., Ltd., Hangzhou, Zhejiang 310009, China
    2. School of Fashion Design & Engineering, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China;
  • Received:2018-07-02 Revised:2019-05-09 Online:2019-08-15 Published:2019-08-16

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Abstract:

In order to evaluate the visibility of children nocturnal safety garments with warning and reminding functions, four children nocturnal safety garments were made of colored luminous fiber and luminous fabrics. By measuring the emission spectrum and the afterglow decay, the equivalent luminance of samples were calculated with the view field of 2°and 10°. Then, the relationship between the equivalent luminance of samples and the measured luminance of samples was studied. The results show that the value of the equivalent luminance of samples are greater than that of the measured luminance. The visual efficiency of the stripe fabric sample is the highest, followed by embroidered garment sample and flannelette fabric sample, and the visual efficiency of samples made of multicolor luminous fiber is better than those made of monochrome luminous fiber. The attenuation trend of equivalent luminance of samples is similar to that of measured luminance of samples. The value of equivalent luminance decreases gradually with time until it tends to be stable and has no significant change in a certain time (about 800 s).

Key words: luminous fiber, safety garment, equivalent luminance, visual efficiency

CLC Number: 

  • TS151

Tab.1

Experimental sample"

样品名称 夜光原料 绣织方法
白色绣花 白色缝纫线 平针绣
蓝白绣花 白色、蓝色缝纫线 平针绣
蓝白条纹 蓝白条纹夜光绒布 贴布绣
白色绒布 白色夜光绒布 贴布绣

Fig.1

T-shirt with white embroidery pattern. (a) With light; (b) Without light"

Fig.2

T-shirt with white-blue embroidery pattern. (a) With light; (b) Without light"

Fig.3

T-shirt with white-blue stripes. (a) With light; (b) Without light"

Fig.4

T-shirt with white flannel. (a) With light; (b) Without light"

Fig.5

Emission spectra of 4 kinds of samples"

Tab.2

Color chromaticity coordinates of samples"

样品名称 2°视场色品坐标 10°视场色品坐标
x2 y2 x10 y10
白色绣花 0.160 223 0.116 914 0.159 376 0.135 725
蓝白绣花 0.151 727 0.085 899 0.149 652 0.108 402
蓝白条纹 0.147 774 0.038 771 0.142 709 0.066 962
白色绒布 0.164 501 0.142 882 0.164 533 0.161 288

Fig.6

Decay curves of samples"

Tab.3

Values of E/L of luminous samples"

样品名称 E2/L E10/L
白色绣花 1.547 138 1.510 684
蓝白绣花 1.616 943 1.573 429
蓝白条纹 1.717 796 1.661 306
白色绒布 1.491 401 1.455 881

Fig.7

Equivalent luminance curves of samples. (a) With field of view 2°;(b) With field of view 10°"

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