A yarn-shaped humidity sensor

A humidity sensor and yarn technology, applied in the field of flexible sensors, can solve problems such as insufficient bonding force, inability to weave into fabrics, etc., and achieve the effects of widening the test range, simple preparation method, and low equipment requirements

Active Publication Date: 2021-02-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional humidity sensor is a hard sensor. Due to its own rigidity, it has certain limitations when it is applied to the collection of human body signals.
For example, rigid sensors cannot be incorporated into textiles through weaving methods, so the fit to the human body is insufficient
However, the film-shaped flexible humidity sensor prepared by patent CN108169295A and CN204514847U is not easy to weave this type of sensor into the fabric according to the weaving method because of its shape characteristics, and it cannot be well bonded to the fabric, so it cannot be well Reflect the application value of flexible humidity sensor

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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  • A yarn-shaped humidity sensor
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  • A yarn-shaped humidity sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] The preparation steps of a biaxial wrapping humidity sensor provided in this embodiment are as follows:

[0065] (1) Metal copper wire is selected as the first electrode 1 and the second electrode 2, and the special-shaped section functionalized yarn is selected as the sensitive material. First, the first electrode 1, the second electrode 2 and the special-shaped section functionalized yarn are placed in an anhydrous Soak in ethanol for 0.5h, then wash 5 times with deionized water, and dry at 60°C for 1h to ensure that the material is free of other impurities.

[0066] (2) Winding the special-shaped cross-section functionalized yarn on the first electrode 1 in an "S" or "Z" shape to obtain a preform.

[0067] (3) Place the prefabricated body and the second electrode 2 in parallel, and then take another special-shaped cross-section functionalized yarn and wind it on the first electrode and the second electrode in an "S" or "Z" shape to form a double electrode. The shaft...

Embodiment 2

[0069] The preparation steps of a biaxial dip-coated humidity sensor provided in this embodiment are as follows:

[0070] (1) Select metal copper wire as the first electrode 1 and the second electrode 2, first soak the first electrode 1 and the second electrode 2 in absolute ethanol for 0.5h, and then use deionized water to wash 5 times to ensure that the materials For other impurities, dry at 60°C for 1 hour.

[0071] (2) Configure sensitive material 3: polyimide needs to be dissolved in N-methylpyrrolidone first to form a polyimide solution with a mass fraction of 15%.

[0072](3) Coating a polyimide solution with a mass fraction of 15% as the sensitive material 3 on the first electrode 1, repeating the coating step three times and then drying at 180° C. for 2 hours to obtain a preform.

[0073] (4) Place the preform and the second electrode 2 in parallel, then coat the polyimide solution on the surface of the preform and the second electrode 2, repeat the coating step 5 ti...

Embodiment 3

[0075] The preparation steps of a uniaxial coated humidity sensor provided in this embodiment are as follows:

[0076] (1) Select metal copper wire as the first electrode 1, silk as the base yarn 4, first soak the first electrode 1 and the base yarn 4 in absolute ethanol for 0.5h, and then use deionized water to wash 5 times to ensure The material has no other impurities, and is dried at 60°C for 1 hour.

[0077] (2) Configure sensitive material 3: polyimide needs to be dissolved in N-methylpyrrolidone first to form a polyimide solution with a mass fraction of 15%.

[0078] (3) Wrap the base yarn 4 on the first electrode 1 in an "S" or "Z" shape, then coat the polyimide solution on the first electrode 1, repeat the coating step 5 times, Dry at 180°C for 2 hours and vacuum dry at 100°C for 12 hours to obtain a preform.

[0079] (4) Partially cover the prefabricated body by the mask plate method, and then sputter metal silver ions onto the surface of the sensitive material 3 b...

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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Abstract

The invention provides a yarn-like humidity sensor, related to the field of flexible sensors. The yarn-like humidity sensor comprises a first electrode, a second electrode, and a sensitive material used for sensing changes of humidity; the first electrode is a metal wire or a conductive yarn, and the conductive yarn comprises a base yarn and a conductive material layer coated on a surface of the base yarn; and the first electrode, the sensitive material and the second electrode are made into a dual-axis humidity sensor or a single-axis humidity sensor. The yarn-like humidity sensor has the advantages of reasonable structural design, simple preparation method and high sensitivity; through good weaving and combination of the yarn-like humidity sensor and a fabric, the yarn-like humidity sensor can be used to detect physiological and health signals of a human body, a sweating condition of the human body, a breathing test and the like, thereby effectively broadening the testing range of the flexible and intelligent wearable field.

Description

technical field [0001] The invention relates to the field of flexible sensors, and in particular to a yarn-shaped humidity sensor. Background technique [0002] The main function of flexible wearable sensors is to detect various physiological and activity signals of the human body, and they are widely used in many fields such as human health monitoring, human motion monitoring, human sweat monitoring, and respiratory monitoring. The flexibility of the humidity sensor is conducive to the persistence and comfort of human body signal collection. The flexible humidity sensor is used to monitor human sweat, breathing and the comfort of the surrounding environment, and has advantages that traditional sensors do not have. The traditional humidity sensor is a hard sensor. Due to its own rigidity, it has certain limitations when it is applied to the collection of human body signals. For example, rigid sensors cannot be incorporated into textiles through weaving methods, so the fit t...

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 Patents(China)
IPC IPC(8): G01N27/22G01N27/04G01N27/12
CPCG01N27/048G01N27/121G01N27/126G01N27/127G01N27/225G01N27/226G01N27/227
Inventor 刘向阳马丽芸吴荣辉
Owner XIAMEN UNIV
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