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A Flexible Strain Sensor with Strain Isolation Effect

A technology of strain sensor and isolation effect, applied in the direction of electric/magnetic solid deformation measurement, electromagnetic measurement device, etc., can solve the problem of limited tensile performance, achieve large tensile performance, wide application prospects, and stable signal output effect

Active Publication Date: 2021-07-20
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the limited tensile performance of the existing crack strain sensor, and provide a flexible strain sensor with strain isolation effect, which has the advantages of simple processing and preparation, low production cost, high sensitivity, large stretching range, stable Good performance and long service life

Method used

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  • A Flexible Strain Sensor with Strain Isolation Effect
  • A Flexible Strain Sensor with Strain Isolation Effect
  • A Flexible Strain Sensor with Strain Isolation Effect

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Step 1. Mix the precursor of polydimethylsiloxane PDMS and curing agent in a weight ratio of 10:1, pour it into a self-made rectangular mold, and use a vacuum pump for 1 hour of degassing treatment, and then place it in a dry place It is cured by heating at 100°C for 2 hours in an oven.

[0050] Step 2. The cured PDMS is peeled off from the mold to obtain a long PDMS spline. Put the PDMS strip in UV / O3 treatment for 20min to produce SiOx oxide layer on the surface. A uniaxial tensile strain is then applied at both ends of the spline, thereby creating cracks on the surface of the spline.

[0051] Step 3. The liquid Ecoflex was spin-coated on the glass slide at a high speed of 2000 rpm by a spin coater to obtain an uncured Ecoflex layer of about 70 μm. Place it at room temperature for 10 minutes to make the uncured Ecoflex transform into a semi-cured state.

[0052] Step 4. Paste the surface with prefabricated cracks in the substrate and Ecoflex in a semi-cured state, ...

Embodiment 2

[0057] Step 1. Mix the precursor of polydimethylsiloxane PDMS and curing agent in a weight ratio of 10:1, pour it into a self-made rectangular mold, and use a vacuum pump for 1 hour of degassing treatment, and then place it in a dry place It is cured by heating at 100°C for 2 hours in an oven.

[0058] Step 2. The cured PDMS is peeled off from the mold to obtain a long PDMS spline. Put the PDMS sample strip in UV / O3 treatment for 10min to produce SiOx oxide layer on the surface. A uniaxial tensile strain is then applied at both ends of the spline, thereby creating cracks on the surface of the spline.

[0059] Step 3. The liquid Ecoflex was spin-coated on the glass slide at a high speed of 2000 rpm by a spin coater to obtain an uncured Ecoflex layer of about 70 μm. Place it at room temperature for 10 minutes to make the uncured Ecoflex transform into a semi-cured state.

[0060] Step 4. Paste the surface with prefabricated cracks in the substrate and Ecoflex in a semi-cured ...

Embodiment 3

[0068] Step 1. Step 1. Mix the precursor of polydimethylsiloxane PDMS and curing agent evenly in a weight ratio of 10:1, pour it into a self-made square mold, and use a vacuum pump for 1 hour of degassing treatment, and then Place in a drying oven and heat at 100°C for 2 hours to cure.

[0069] Step 2. Peel the cured PDMS from the mold to obtain a square PDMS substrate. Make a cross-shaped mask through a paper cutter, and define a cross-shaped area on the PDMS substrate for UV / O 3 Treat for 10min, produce SiO on the surface x oxide layer. A first uniaxial stretch of 150% was applied at both ends of the substrate, resulting in long cracks perpendicular to the stretching direction on the substrate surface. Subsequently, a second uniaxial stretch of 200% is applied in a direction perpendicular to the first uniaxial stretch, so that short cracks perpendicular to the second stretch are generated on the surface of the substrate to form a network crack structure.

[0070] Step 3....

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Abstract

The invention relates to a flexible strain sensor with strain isolation effect. The strain sensor includes: a flexible substrate, the surface of the flexible substrate is prefabricated with a parallel crack structure or a grid crack structure obtained by stretching by a certain method; a strain isolation layer, the strain isolation layer has a modulus much smaller than that of the substrate an elastomer; a conductive filler coated on the strain isolation layer as a strain response layer; and electrodes at both ends of the strain response layer. The flexible crack strain sensor obtained by the invention can obtain greater stretchability while maintaining higher sensitivity. In addition, in order to adapt to the complex strain conditions of the human body, the substrate provided by the invention has a network crack structure to realize the multi-directional detection function. The invention solves the problem of limited tensile performance when the crack strain sensor has high sensitivity, and cannot adapt to the complex The question of contingencies.

Description

technical field [0001] The invention belongs to the technical field of sensor manufacturing, in particular to a flexible strain sensor with strain isolation effect. Background technique [0002] Flexible wearable strain sensors are widely used in electronic skin, human motion monitoring, human-computer interaction, and soft robotics. By converting the mechanical stimulation of the human body into electrical signals and transmitting them to mobile phones or computers, through the statistics of big data, it can accurately reflect the real-time physical condition of the human body and predict the health of the human body. For example, the real-time blood pressure of the human body can be obtained by sensing the weak pulse of the human body through flexible wearable sensors. In order to be able to reflect various indicators of the body more reliably, a high-sensitivity strain sensor is urgently needed to accurately identify various movements of the human body. In 2014, Kang et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/16
CPCG01B7/18
Inventor 王秀锋刘志哲刘杨承毅
Owner XIANGTAN UNIV
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