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Flexible wearable strain sensor based on fabrics and preparation method thereof

A strain sensor and fabric technology, applied in the field of wearable sensors, can solve the problems of low sensitivity, unable to meet the requirements of wearable strain sensors, etc., and achieve the effects of high sensitivity, good cycle stability and durability, and excellent performance.

Active Publication Date: 2016-08-10
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional strain sensors based on semiconductors or metal foils are usually rigid and have low sensitivity, which cannot meet the requirements of wearable strain sensors.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Flexible wearable strain sensor based on fabrics and preparation method thereof
  • Flexible wearable strain sensor based on fabrics and preparation method thereof
  • Flexible wearable strain sensor based on fabrics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Preparation of a flexible wearable strain sensor using plain silk fabric as raw material

[0025] A silk fabric with a plain weave structure (the warp yarn is composed of multiple twisted silk fibers, and the weft yarn is composed of multiple parallel silk fibers) is mixed in an argon-based argon-hydrogen gas (the flow ratio of argon to hydrogen is 10:1). Under atmosphere or nitrogen atmosphere, high-temperature heat treatment at 950 ° C to obtain carbonized fabrics that maintain a plain weave structure (the specific temperature rise program is first raised to 150 ° C at a heating rate of 10 ° C / min and kept for 60 min, and then raised to 150 ° C at a heating rate of 5 ° C / min Keep at 350°C for 180min, then rise to 950°C at a rate of 3°C / min and keep for 90min, then cool down to room temperature naturally), the carbonized fabric obtained under this heating program has higher conductivity (its surface resistance is about 140Ω / □); then cut the carbonized f...

Embodiment 2

[0026] Embodiment 2: Mechanism of strain detection of carbonized plain weave structure silk fabric strain sensor

[0027] First, pre-stretch the carbonized plain silk fabric strain sensor, the yarn in the stretching direction is broken, and the micron silk in the yarn perpendicular to the stretching direction is spread out, see the attached Figure 6 (a). In the strain detection process, the pre-stretched strain sensor is used to pre-stretch the broken yarn in the stretching direction. As the strain is applied, the contact point decreases, resulting in an increase in resistance to detect the strain. For the yarn perpendicular to the stretching direction The spreading of the micron silk in the wire ensures a conductive path under large strains resulting in a large detection strain, see appendix Figure 6 (b-d).

Embodiment 3

[0028] Embodiment 3: Cotton fiber fabric and rayon (modal) fabric high temperature heat treatment procedure and conductivity

[0029] Cotton fiber fabrics and modal fabrics are heated to 900°C or 1050°C at a heating rate of 3°C / min in argon-based argon-hydrogen (argon-hydrogen flow ratio 10:1) mixed atmosphere or nitrogen atmosphere, and then Keeping it for 200 minutes, a carbonized fabric with high conductivity and maintaining the original fabric structure can be obtained. The surface resistance of carbonized cotton fiber fabric is about 80Ω / □ (900°C treatment), and the surface resistance of carbonized modal fabric is about 5.5Ω / □ (900°C treatment) and 1.8Ω / □ (1050°C treatment).

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Abstract

The present invention discloses a flexible wearable strain sensor based on fabrics and a preparation method thereof. Fabrics are taken as raw materials; carbonization fabrics capable of keeping the structure of original fabrics and having flexibility and electrical conductivity in the high-temperature heat treatment process in the atmosphere of taking inert atmosphere or inert gases as the principal thing; two ends of the carbonization fabrics are connected wires or integration wireless emission receiving module; and a flexible wearable strain sensor is obtained through package by using elastomeric polymers. The flexible wearable strain sensor based on fabrics are able to directly attach to the skin, the clothes or other wearable accessories to realize the wearable detection of human joint movement, pulse, microexpression, breath, sound production or audio frequency. The flexible wearable strain sensor based on fabrics and the technological process of production thereof are sustainable in development, simple in preparation, low in cost, good in flexibility, wide in strain detection range, high in sensitivity, short in response time, good in cycling stability and durability, and broad in application prospect.

Description

technical field [0001] The invention relates to the technical field of wearable sensors, in particular to a fabric-based flexible wearable strain sensor and a preparation method thereof. Background technique [0002] In recent years, wearable electronic devices have developed rapidly and become an important trend in the development of next-generation electronic products. As an important branch of wearable electronic devices, wearable strain sensors should have certain characteristics such as mechanical flexibility, fit, high stretchability, high sensitivity, fast response, and high durability to achieve their wearable characteristics and their Wide application in personal medical treatment, motion detection, human-computer interaction, virtual reality entertainment technology, etc. However, traditional strain sensors based on semiconductors or metal foils are usually rigid and have low sensitivity, which cannot meet the requirements of wearable strain sensors. The currentl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 张莹莹王春雅
Owner TSINGHUA UNIV
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