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Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array

A pressure sensor, ultra-high capacitance technology, applied in the direction of instruments, measuring force, measuring devices, etc., can solve the problems of unfavorable application, susceptibility to noise interference sensitivity, etc., and achieve high signal-to-noise ratio, high sensitivity, and good pressure sensing performance Effect

Active Publication Date: 2021-08-03
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the physical limitations of this mechanism, its capacitance level is limited to the pF level, which is equivalent to the parasitic capacitance in the circuit and the capacitance level of the external environment noise. It is susceptible to noise interference and has low sensitivity, which is not conducive to the application in the actual environment.

Method used

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  • Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array
  • Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array
  • Flexible wearable pressure sensor with ultrahigh capacitance and pressure sensor array

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] like figure 1 As shown, a flexible wearable pressure sensor with ultra-high capacitance includes an upper encapsulation layer 1, an upper conductive fabric electrode 21, a middle support frame 4, a lower conductive fabric electrode 51 and a lower encapsulation layer arranged sequentially from top to bottom. Layer 6, the central conductive hydrogel 31 is arranged in the central support frame 4 .

[0038] Wherein, the conductive hydrogel used is cylindrical, with a thickness of 4 mm and a radius of 3 mm. The preparation method of the conductive hydrogel is as follows: dissolving acrylamide monomer (9.98wt%) and sodium chloride or lithium chloride (16.16wt%) in deionized water to prepare an acrylamide-salt ion solution. A solution of N,N-methylenebisacrylamide was prepared as a crosslinking agent, and its solution concentration was 1.2wt%. Next, mix and stir the crosslinking agent solution (1.13wt%), ketoglutaric acid (photoinitiator) (2.2wt%), acrylamide-salt ion soluti...

Embodiment 2

[0045] like Figure 4 As shown, this embodiment provides a flexible and wearable two-dimensional pressure sensing array with ultra-high capacitance, which includes 16 sensing units, and each sensing unit is arranged in the same plane in an orthogonal arrangement. The specific structure is that the upper encapsulation layer 1, the upper conductive fabric electrode layer 2, the middle conductive hydrogel layer 3, the lower conductive fabric electrode layer 5 and the lower encapsulation layer 6 are sequentially arranged from top to bottom;

[0046] The upper conductive woven electrode layer 2 includes four upper conductive woven electrodes 21 arranged at equal intervals, the lower conductive woven electrode layer 5 includes four lower conductive woven electrodes 51 arranged at equal intervals, the four upper conductive woven electrodes 21 and The four lower conductive fabric electrodes 51 are arranged in a vertically intersecting manner;

[0047] The middle conductive hydrogel l...

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Abstract

The invention provides a flexible wearable pressure sensor with ultrahigh capacitance, which comprises an upper packaging layer, an upper conductive woven fabric electrode, a middle support frame, a lower conductive woven fabric electrode and a lower packaging layer which are sequentially arranged from top to bottom, and middle conductive hydrogel is arranged in the middle support frame. The pressure sensor provided by the invention has ultrahigh capacitance (which can reach nF-muF magnitude), can effectively resist interference (pF magnitude) of environmental capacitance noise, has the advantages of high sensitivity and high signal-to-noise ratio, and can be used for preparing wearable array pressure-sensitive skin.

Description

technical field [0001] The invention relates to the technical field of pressure sensors, in particular to a flexible wearable pressure sensor with ultrahigh capacitance and a pressure sensor array. Background technique [0002] Pressure sensors can sense external pressure and convert pressure signals into electrical signals, and have a wide range of applications in industrial production, life and other fields. Traditional pressure sensors rely on rigid electronic devices, which are difficult to adapt to the deformation of soft interfaces such as human skin, so their application fields are limited. [0003] In recent years, emerging flexible pressure sensors use new soft functional materials that are easy to deform and stretch, which have good flexibility and biocompatibility, and can be applied to wearable electronic skin, soft robot tactile perception and other fields. [0004] The mechanism of flexible pressure sensors can be divided into resistive, capacitive, piezoelect...

Claims

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Application Information

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IPC IPC(8): G01L1/14
CPCG01L1/142
Inventor 谷国迎沈泽群
Owner SHANGHAI JIAO TONG UNIV
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