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Stretchable pressure sensor array

A pressure sensor and pressure technology, which is applied in fluid pressure measurement, instrumentation, measurement force and other directions by changing ohmic resistance, can solve problems such as poor stretchability, small mechanical detection range, and complex data processing process

Active Publication Date: 2021-09-28
北京石墨烯研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing resistive pressure sensor array can realize distributed pressure testing, its mechanical detection range is small and the data processing process is complicated
[0004] At the same time, traditional array sensor devices mostly use non-stretchable rigid substrates or unstructured polymer materials with low stretchability as the encapsulation layer, which has small deformation and poor stretchability, and it is difficult to adjust the deformation amount. Accurate sensing of contact interaction force and its dynamic distribution information between large flexible contact interface, curved surface and irregular shape contact interface

Method used

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Examples

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Effect test

preparation example Construction

[0071] One embodiment of the present invention provides a method for preparing the aforementioned stretchable pressure sensor array, including:

[0072] The step of preparing the pressure sensitive layer;

[0073] The step of preparing conductive layer;

[0074] The step of preparing encapsulation layer;

[0075] disposing the encapsulation layer on the surface of the conductive layer to form a flexible circuit board; and

[0076] The pressure-sensitive layer is sandwiched between two flexible circuit boards to prepare a stretchable pressure sensor array.

[0077] In one embodiment, the process for preparing the pressure sensitive layer includes:

[0078] Add carbon-based powder to PDMS, planetary stirring to disperse evenly, then add curing agent and mechanically stir to prepare evenly dispersed carbon-based powder-PDMS composite slurry;

[0079] Add conductive ink to the carbon-based powder-PDMS composite slurry, and mechanically stir evenly to prepare conductive elastom...

Embodiment 1

[0093] (1) The conductive composition used includes 10wt% carbon fiber powder, 34wt% conductive ink and 56wt% polydimethylsiloxane (PDMS);

[0094] Add carbon fiber powder to PDMS, planetary stirring to disperse evenly, and then add curing agent to mechanically stir to obtain a uniformly dispersed carbon fiber-PDMS composite slurry; add conductive ink to carbon fiber-PDMS composite slurry, and mechanically stir to obtain a conductive Elastomer slurry; spread the conductive elastomer slurry on a smooth glass plate for curing to obtain a 700um thick flexible composite conductive film; cut the flexible composite conductive film into 16 cube pressure sensitive units of 1×1mm.

[0095] (2) Using copper foil as the base material, it is made by photoimaging pattern transfer and etching process such as image 3 As shown in the first electrode layer 20, the first electrode layer 20 includes 16 first conductive node parts 22 arranged in an array, and the connecting wire part 21a is wavy...

Embodiment 2

[0101] This embodiment uses the same raw materials, steps, process conditions, etc. as in Example 1. The only difference is that the step (1) of Example 1 makes a flat pressure-sensitive unit, and what this embodiment makes is a pressure-sensitive unit with a square pyramid. Pressure sensitive unit with raised structure. The preparation steps of the pressure sensitive unit are:

[0102] Use a laser cutting machine to engrave a quadrangular pyramid array with a gap distance of 0.2mm to make a pressure-sensitive layer patterned mold, in which the bottom surface of the quadrangular pyramid has a side length of 0.2×0.2mm and a height of 50um;

[0103] Add carbon fiber powder to PDMS, planetary stirring to disperse evenly, and then add curing agent to mechanically stir to obtain a uniformly dispersed carbon fiber-PDMS composite slurry; add conductive ink to carbon fiber-PDMS composite slurry, and mechanically stir to obtain a conductive Elastomer slurry; pour the prepared conducti...

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Abstract

The invention provides a stretchable pressure sensor array which comprises a pressure sensitive layer, the pressure sensitive layer comprises a plurality of pressure sensitive units, the pressure sensitive units are made of a conductive composition, and the conductive composition comprises an elastomer material, carbon-based powder and conductive ink. Each pressure sensitive unit comprises a first surface and a second surface opposite to the first surface, and the first surface is a plane or comprises a plurality of convex structures. According to the pressure sensor array, the resistance change can be detected within a relatively large external force range.

Description

technical field [0001] The invention relates to a pressure sensor, in particular to a stretchable pressure sensor array. Background technique [0002] With the development of flexible electronics, flexible sensing technology has gradually developed into an eye-catching high-tech intelligent interaction technology, which can realize the sensing of contact interaction force between flexible contact interface, curved surface and irregular shape contact interface. , and the sensing of dynamic distribution information plays a crucial role. [0003] Flexible resistive pressure sensors have been extensively studied due to their simple structure and high sensitivity. Although the existing resistive pressure sensor array can realize distributed pressure testing, its mechanical detection range is small and the data processing process is complicated. [0004] At the same time, traditional array sensor devices mostly use non-stretchable rigid substrates or unstructured polymer materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/20G01L1/22G01L9/04
CPCG01L1/205G01L1/22G01L9/04
Inventor 魏迪周亚宁张丽娟王杨俭柳絮钟梦娟付捷
Owner 北京石墨烯研究院有限公司
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