Journal of Textile Research ›› 2023, Vol. 44 ›› Issue (06): 114-120.doi: 10.13475/j.fzxb.20220104801

• Textile Engineering • Previous Articles     Next Articles

Measurement of infrared emissivity and photothermal absorption rate of fabrics with dual photothermal radiation sources

ZHANG Yue1, CHEN Yisong1,2(), BIAN Yuyao1, LIU Yi1   

  1. 1. College of Fashion and Design, Donghua University, Shanghai 200051, China
    2. Key Laboratory of Clothing Design and Technology, Ministry of Education, Donghua University, Shanghai 200051, China
  • Received:2022-01-21 Revised:2022-09-07 Online:2023-06-15 Published:2023-07-20
  • Contact: CHEN Yisong E-mail:cys@dhu.edu.cn

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Abstract:

Objective The infrared emissivity and photothermal absorption rate of fabrics are two important indexes related to the thermal comfort and protection performance of clothing. To study these two characteristics of fabrics, this research aims to explore the infrared emissivity and photothermal absorption rate of fabrics under different photothermal radiation sources through the test device designed according to the new measurement principle, which provides a theoretical basis for the selection of photothermal radiation sources.
Method High reflectance KT board was used in the test device and unidirectional insulation was realized, which eliminated the influence of fabric transmission and solved the real temperature measurement of fabric. During the experiment, the surface real temperature and radiant temperature of 20 fabric samples with different composition, color and structure as well as black copper plate were measured by iodine tungsten lamp and xenon lamp with two color temperatures. The convective heat dissipation coefficients of the reference black body and fabric surface were determined, and the average infrared emissivity and average photothermal absorption rate of fabrics were calculated.
Results Under the radiation of iodine tungsten lamp and xenon lamp, the infrared emissivity of fabrics were found to be in ranges of 0.65-0.85 and 0.60-0.95 respectively, and the photothermal absorptivity of fabrics were in 35%-60% and 30%-90% respectively. The infrared emissivity of the same sample under these two radiation conditions had a certain difference, but both standard deviations were 0.06, with CV values of 7.40% and 12.55%, respectively. It might be that the groups in the fabric dyes could respond to the infrared band, so that the results under different light sources were different. On the other hand, the spectrum of the iodine tungsten lamp coincided with the infrared emission spectrum of fabrics at 8-14 μm by 5%, resulting in a certain interference effect fabric reflection on the measurement of radiation temperature in the iodine tungsten lamp spectrum. The xenon lamp spectrum had no overlap with the measuring window of 8-14 μm, and fabrics had no effect on its reflection. As the proportion of visible light in xenon lamp was greatly improved compared with that in iodized tungsten lamp, the data gap between white fabric and black fabric expanded from 15% to about 60%, which fully reflected the absorption and reflection of sunlight by the color of fabrics. In addition, the test results under both light sources showed that the thickness and gram weight of the fabric had no significant correlation with infrared emissivity (P>0.05), while the fabric type had significant correlation with infrared emissivity (P>0.05). The order of infrared emissivity from high to low was wool, cotton, polyester. The gram weight and type of fabric were not significantly correlated with the photothermal absorption rate (P>0.05), while fabric thickness was low correlation with the photothermal absorption rate (P<0.05, |r|=0.50).
Conclusion The infrared emissivity of fabrics has a certain dependence while the photothermal absorption rate of fabrics has a strong dependence on the color temperature of the light source, which is mainly because the color of the fabric has a strong reflection of the visible wavelength. Because the spectrum of the iodine tungsten lamp overlapped with the measuring band of the infrared temperature sensor, the reflection of the fabric interferes to some extent, and there will be errors in the measurement results. However, xenon lamp has no interference of spectral overlap, so its measurement results are more accurate and it is more suitable as the photothermal radiation source for the test.

Key words: photothermal radiation, photothermal absorption rate, infrared emissivity, fabric, thermal characteristic, thermal lamp

CLC Number: 

  • TS941.16

Fig. 1

Testing equipment for measuring infrared emissivity and photothermal absorption rate of fabric"

Fig. 2

Infrared image of each test unit"

Tab. 1

Polynomial fitting results of air physical parameters at temperature 200-500 K"

温度函数 a3 a2 a1 a0
ν(T) -6.00×10-14 1.65×10-10 1.22×10-8 -9.60×10-7
K(T) -1.56×10-13 3.20×10-10 -9.02×10-9 5.38×10-7

Tab. 2

Physical parameters of samples"

编号 织物名称 颜色 组织
结构		 厚度/
mm		 面密度/
(g·m-2)
A1 薄棉布 白 平纹 0.338 137.28
A2 黄 平纹 0.338 137.28
A3 黑 平纹 0.338 137.28
B1 厚棉布 白 斜纹 0.788 256.80
B2 黄 斜纹 0.788 256.80
B3 黑 斜纹 0.788 256.80
C1 中厚棉布 红 斜纹 0.744 264.24
C2 蓝 斜纹 0.728 268.26
C3 黑 斜纹 0.766 269.94
D 格格棉布 土黄 斜纹 0.456 182.88
E1 薄羊毛织物 灰白 平纹 0.812 250.36
E2 姜黄 平纹 0.844 307.32
E3 红 平纹 0.534 194.76
F1 厚羊毛织物
(正面)		 浅褐 斜纹 2.368 304.90
F2 厚羊毛织物
(反面)		 深褐 斜纹 2.368 304.90
G1 涤纶织物 白 斜纹 0.422 206.06
G2 黄 斜纹 0.456 240.44
G3 黑 斜纹 0.420 228.16
H1 褶皱涤纶织物
(正面)		 黑 平纹 1.170 135.84
H2 褶皱涤纶织物
(反面)		 灰 平纹 1.170 135.84

Fig. 3

Comparison of infrared emissivity"

Fig. 4

Comparison of photothermal absorption rate"

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