Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (02): 94-99.doi: 10.13475/j.fzxb.20180601506

• Textile Engineering • Previous Articles     Next Articles

Characteristics of capacitive pressure sensor based on warp-knitted spacer fabric

SUN Wan, MIAO Xuhong(), WANG Xiaolei, JIANG Gaoming   

  1. Engineering Research Center for Knitting Technology, Ministry of Education, Jiangnan University, Wuxi, Jiangsu 214122, China
  • Received:2018-06-01 Revised:2018-08-07 Online:2019-02-15 Published:2019-02-01
  • Contact: MIAO Xuhong E-mail:miaoxuhong@163.com

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Abstract:

In order to achieve the intelligent cushion monitoring human sitting posture to assist human health, six types of warp-knitted spacer fabrics were used as the dielectric layer to prepare pressure-capacitance sensors. The static performance of warp-knitted spacer fabric pressure-capacitance sensors was studied. Compression and electrical experiments were performed on six kinds of sensors to obtain a stress-capacitance curve. Combining the compression performance of the warp-knitted spacer fabric, the stress-capacitance curve of the sensor was divided into three stages, and the sensitivity and linearity of each stage were studied. The results show that as the pressure increases, the linearity of the capacitive pressure sensor gradually deteriorates. The sensitivity of the capacitive pressure sensor gradually increases and then gradually decreases. In the compressed platform area of the spacer fabric, the capacitive sensor has the greatest sensitivity, and in the elastic area where the spacer fabric is compressed, the capacitive sensor has the best linearity.

Key words: spacer fabric, pressure capacitive sensor, sensitivity, linearity

CLC Number: 

  • TS181

Fig.1

Pressure capacitive sensor based on warp-knitted spacer fabric"

Tab.1

Warp-knitted spacer fabric specification parameters"

编号 上表面
结构		 下表面
结构		 间隔丝
直径/mm		 间隔丝面密度/
(根·cm-2)		 间隔丝
长度/mm
1# 结构1 结构1 0.16 80 22.6
2# 结构2 结构2 0.16 64 21.0
3# 结构1 结构1 0.18 97 29.5
4# 结构3 结构4 0.18 63 15.5
5# 结构1 结构1 0.20 94 30.2
6# 结构5 结构6 0.20 91 12.1

Fig.2

Surface structure of warp-knitted spacer fabric. (a) Structure 1; (b) Structure 2; (c) Structure 3;(d) Structure 4; (e) Structure 5; (f) Structure 6"

Fig.3

Experimental process"

Fig.4

Sensor characteristic curve of stress-capacitamce (a) and stress-relative capacitance(b)"

Fig.5

Sensor characteristic curve of stress-strain"

Tab.2

Linearity and strain range of sensor in three stages"

试
样		 Ⅰ Ⅱ Ⅲ
E1 应变/% E2 应变/% E3 应变/%
1# 0.216 0~30 12.120 30~60 13.028 60~75
2# 2.968 0~30 6.688 30~60 19.357 60~85
3# 2.861 0~30 7.837 30~60 20.455 60~78
4# 5.678 0~30 7.933 30~60 9.933 60~78
5# 1.750 0~30 3.479 30~60 9.695 60~75
6# 3.633 0~30 4.280 30~60 8.889 60~70

Tab.3

Sensitivity and stress ranges for three stages of sensor"

试样 Ⅰ Ⅱ Ⅲ
S1 应力范围/kPa S2 应力范围/kPa S3 应力范围/kPa
1# 4.593 0~9.188 24.662 9.188~14.498 1.292 14.498~276.779
2# 12.254 0~3.026 45.263 3.026~5.307 3.522 5.829~191.420
3# 4.356 0~8.716 15.158 8.716~15.735 1.045 15.735~383.800
4# 3.512 0~12.002 11.576 12.002~21.760 2.062 21.760~209.680
5# 3.770 0~9.750 8.386 9.750~24.486 1.085 24.486~337.887
6# 1.126 0~28.192 8.091 28.192~43.036 1.107 43.036~215.246
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