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Flexible force tactile sensor based on transparent biomaterial, sensitive element and preparation method thereof

A tactile sensor and biomaterial technology, applied in the field of sensing, can solve problems such as low service life, low flexibility, and low precision, and achieve the effects of saving time and cost, reducing water evaporation, and reducing impact

Active Publication Date: 2020-06-12
ANHUI MEDICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of low flexibility, low service life and low precision of traditional tactile sensors, and propose a design of electronic skin sensor based on hydrogel

Method used

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  • Flexible force tactile sensor based on transparent biomaterial, sensitive element and preparation method thereof
  • Flexible force tactile sensor based on transparent biomaterial, sensitive element and preparation method thereof
  • Flexible force tactile sensor based on transparent biomaterial, sensitive element and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The preparation of embodiment 1 sensitive element

[0039] 1) Preparation of PDMS

[0040] 1> Mix PDMS and curing agent (Sylgard 184silicone elastomer, Dow Corning) in proportion (10:1), place in a centrifugal mixer, and stir at 1500RPM for 10 minutes to make it evenly mixed.

[0041] 2> Pour the stirred PDMS into the plastic spinner mold and rotate at 150RPM for 3 minutes to spread it evenly.

[0042] 3>Place the evenly spread PDMS on the heating table and heat it at 50°C for 2 hours to form it.

[0043] 2) Preparation of hydrogel colloid

[0044]1>Add 0.4g Sodium alginate and 0.2g Ethylenediamine tetra acetic acid calcium Disodium salt hydrate to 10ml of deionized water, put it in a centrifugal mixer, and stir at a speed of 1000RPM 10 minutes to mix well.

[0045] 2>Add 0.2g of glucono δ-lactone to the well-mixed colloid, place it in a centrifugal mixer, and stir at a speed of 1000RPM for 2 minutes to make it evenly mixed.

[0046] 3) PDMS-hydrogel-PDMS structure...

Embodiment 2

[0053] Embodiment 2 The sensor is applied to the human arm

[0054] Such as image 3 As shown, the flexible force tactile sensor based on transparent biomaterials described in the present invention is installed on the human arm, the sensitive element 10 is attached to the arm, and a wired bridge measurement circuit 20, an AD conversion circuit 30 and a display 40 are used in sequence. . The sensor shown in the figure is in the bridge circuit. The pressure change of the sensor causes the resistance value to change, which causes the output voltage of the bridge circuit to change. After being amplified by the amplifier, the voltage signal is recorded by the single-chip microcomputer.

Embodiment 3

[0055] Embodiment 3 The sensor is applied to the fingertip of a person

[0056] Figure 4 The sensor is demonstrated to enable wireless tactile measurements. The principle of the flexible sensor can also be used to achieve tactile measurement in a small area through high-precision three-dimensional printing, such as fingertips. At the same time, using wireless transceiver technology, the sensor can realize wireless signal transmission. The single-chip microcomputer records the resistance value of the sensor changed by the force through the bridge, and transmits it through the wireless module; the host computer receives, displays and records the tactile signal through the wireless module.

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Abstract

The invention belongs to the technical field of sensing, and in particular relates to a flexible force tactile sensor based on a transparent biomaterial, a sensitive element and preparation methods ofthe flexible force tactile sensor and the sensitive element. The sensitive element comprises a water-retaining layer substrate and hydrogel wrapped with the water-retaining layer substrate, wherein solute of the hydrogel is prepared from sodium alginate, ethylenediamine tetraacetate disodium calcium and glucono delta-lactone according to a mass ratio of 2 to (0.5-1.5) to (0.5-1.5), wherein the mass concentration of the sodium alginate is 2-6%. The sensor comprises the sensitive element, a measuring circuit, an analog-to-digital (AD) conversion circuit and a display device which are sequentially connected in a wired or wireless way. According to the preparation method, the ionic-crosslinked sustained release system hydrogel is used as a sensor main body, and calcium ions in ethylenediaminetetraacetate disodium calcium are slowly released by using the glucono delta-lactone, ionic crosslinking is formed by the calcium ions and a sodium alginate monomer, the water molecules are connectedinside a mesh structure, and then certain water conservation measures are utilized, so that the moisture emission is reduced, and the stability of the sensor is maintained.

Description

technical field [0001] The invention belongs to the field of sensing technology, and in particular relates to a flexible force touch sensor based on transparent biomaterials, a sensitive element and a preparation method thereof. Background technique [0002] The research on human-computer interaction is of great significance for improving the "friendliness" of computer systems and simplifying the information exchange process between humans and computers. For now, the interactive mode of human-computer integration has become the mainstream mode. In order to realize the ideal human-computer interaction mode, the tactile sensor is required to have higher softness and biocompatibility. Therefore, we propose a hydrogel-based tactile sensor design for electronic skin. The high flexibility and high biocompatibility of hydrogel are of great significance for the realization of human-computer interaction. [0003] The current mainstream tactile sensors are manufactured based on har...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 杨润怀缪安琦
Owner ANHUI MEDICAL UNIV
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