Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (12): 159-165.doi: 10.13475/j.fzxb.20210404207

• Machinery & Accessories • Previous Articles     Next Articles

Development of clothing pressure detector based on flexible film sensor

LIU Jie, GAO Zhi()   

  1. School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China
  • Received:2021-04-15 Revised:2021-09-06 Online:2021-12-15 Published:2021-12-29
  • Contact: GAO Zhi E-mail:gaozhi@ecust.edu.cn

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Abstract:

In order to increase the compliance of the sensor in the clothing pressure detector while it is attached to human body, and then improve the precision of clothing pressure measurement, a new method of measuring clothing pressure with flexible film sensor is presented. Using polyvinyl chloride as a flexible matrix, coated with the conductive fibers, a flexible film sensor has been designed. The sensor is connected with the buffer air chamber and the pneumatic circuit is constructed through the buffer chamber, an air pump and an exhaust valve, it can convert clothing pressure to air chamber pressure. Based on the flexible film sensor, a clothing pressure detector that can be operated with a touch screen as well as store and print testing data has been developed, which choose programmable logic controller as the main control unit. After the system calibration was completed, the precision and feasibility of the detector were verified by repeated experiments. The maximum standard deviation of the six measurements was 0.088 5. The detector can measure the pressure of clothes at multiple point accurately in real time. It can be used for product testing in pressure garment factories, and it also provides a new idea for the research on clothing pressure detection method and the selection of control elements.

Key words: clothing pressure detection, flexible film sensor, programmable logic controller, touch screen interface design, polynomial fitting method

CLC Number: 

  • TS941.79

Fig.1

Flexible film sensor. (a) Front of sensing detection belt; (b) Back of sensing detection belt; (c) Physical map of flexible film sensor"

Fig.2

Circuit schematic of sensing detection belt"

Fig.3

Overall detection system block diagram"

Fig.4

Serial port pins for communication between printer and touch screen. (a) Touch screen 9-pin D type plug; (b)Printer IDC 10-pin socket"

Fig.5

Flowchart of main program"

Fig.6

User interface of touch screen"

Fig.7

Print interface of touch screen"

Fig.8

Calibration data fitting curve"

Fig.9

Product of pressure testing device for pressure garments"

Fig.10

Schematic diagram of experimental measurement. (a) Official measurement points; (b) Field test"

Tab.1

Repeated measurements of different locations"

测试编号 A B C D G
1 3.265 3.479 3.788 3.975 4.105
2 3.143 3.488 3.879 3.857 4.173
3 3.378 3.389 3.725 3.764 4.068
4 3.189 3.506 3.879 3.995 4.013
5 3.334 3.569 3.776 3.920 4.201
6 3.297 3.403 3.694 3.896 4.191
均值 3.267 7 3.472 3 3.790 2 3.901 2 4.125 2
标准偏差 0.088 5 0.067 1 0.076 8 0.084 1 0.075 7
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