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Micro-channel stress sensor based on structural metamaterial and preparation method thereof

A stress sensor, micro-channel technology, applied in the direction of micro-structure technology, micro-structure devices, instruments, etc., can solve problems such as the influence of induction characteristics

Active Publication Date: 2021-07-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the microchannel stress sensor has a certain directionality. In the direction of different forces, the resistance change will show the opposite trend, and the intrinsic characteristics of flexible elastic materials lead to the coupling of forces between mutually perpendicular directions. This also leads to the fact that the induction characteristics in the two directions perpendicular to each other will affect each other.

Method used

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  • Micro-channel stress sensor based on structural metamaterial and preparation method thereof
  • Micro-channel stress sensor based on structural metamaterial and preparation method thereof
  • Micro-channel stress sensor based on structural metamaterial and preparation method thereof

Examples

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Embodiment 1

[0045] A method for preparing a microfluidic stress sensor based on structural metamaterials, comprising the following steps:

[0046] Step 1. Prepare the flexible superstructure grid layer. The specific process is: using a laser cutting machine (model Delonghi inducer-6001-N), laser cutting on a 50 μm thick polyimide (PI) film to form concave hexagons Shaped grid; wherein, the length h of the horizontal side is 1.54mm, the width is 1.2mm, the length L of the hypotenuse is 2.4mm, and the width is 1.2mm, and the angle θ between the hypotenuse and the vertical direction is 27° and 33° respectively , 35° and 45°, the obtained flexible superstructure grid layers are named frameA1, frameB1, frameC1, frame D1 respectively;

[0047] Step 2. Prepare the upper elastic polymer layer and the conductive graphene channel using a microfluidic mold. The specific process is:

[0048] Step 2.1. Mix the glue A and glue B of Ecoflex0030 according to the ratio of volume fraction 1:1, and stir un...

Embodiment 2

[0059] Prepare the microchannel stress sensor according to the steps of the embodiment, adjust the specific parameters of the flexible superstructure grid layer in step 1: the angle θ between the hypotenuse and the vertical direction is 27 °, and the length ratio between the horizontal side and the hypotenuse is maintained as 1:1.56 remains unchanged, when the hypotenuse length h is 2.4mm, the width ratios of the horizontal side and the hypotenuse are 1:1 (the widths are 1.2mm and 1.2mm respectively) and 1:2 (the widths are 0.6mm and 1.2mm), the resulting flexible superstructure grid layers are named frameA1 and frameA2 respectively. In addition, keep the length ratio unchanged, set the length of the hypotenuse to 1.2mm, and the width ratios of the horizontal side and the hypotenuse are 1:1 (the width is 0.6mm and 0.6mm respectively) and 1:2 (the width is 0.6mm respectively) mm and 1.2mm), named as frameA3 and frameA4 respectively, and the other steps remain unchanged, wherein...

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Abstract

The invention provides a micro-channel stress sensor based on a structural metamaterial and a preparation method of the micro-channel stress sensor, and belongs to the technical field of stress sensor preparation. According to the micro-channel stress sensor designed by the invention, a layer of flexible superstructure grid layer in the shape of a concave hexagon is additionally arranged below a micro-channel of a conventional stress sensor, so that the sensor can realize device resistance change trend reversal when being axially stretched, the resistance change trend of the device in all directions is unified, and the strain coefficient of the device is improved. The influence degree of the negative Poisson's ratio characteristic on the micro-channel stress sensor is regulated and controlled through the unit structure parameter design and the unit distribution design of the concave hexagonal grid, so that the device can be completely insensitive to the stretching direction of the pipe diameter, namely, the stress decoupling in the axial direction and the transverse direction is realized; and a reasonable design direction is provided for the device to only measure the stress signal in the specific direction.

Description

technical field [0001] The invention belongs to the technical field of stress sensor preparation, and in particular relates to a microchannel stress sensor based on structural metamaterials and a preparation method thereof. Background technique [0002] In recent years, flexible mechanical sensors, as an important part of flexible electronic devices, have attracted extensive attention and research, because they can be applied to wearable devices, soft robots, electronic skin, prosthetics and various fields of human-computer interaction. middle. For different fields, it is often necessary to design various flexible mechanical sensors with different functional characteristics. [0003] Among all kinds of flexible mechanical sensors, they can be roughly divided into three categories according to the test signal output types of mechanical sensors, namely resistance variable type, capacitive variable type and piezoelectric type. In addition, according to the change mechanism of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/22B81B7/04
CPCG01L1/2287B81B7/04
Inventor 潘泰松毛琳娜颜卓程姚光高敏林媛
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA