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Continuous monitoring flexible pressure sensor and composite film layer production method

A pressure sensor and composite film technology, applied in the field of flexible sensors, can solve the problems of large signal interference, difficulty in detecting pressure changes, unfavorable system continuous operation, etc., and achieve the effects of improving detection sensitivity, large voltage amplitude and low cost

Pending Publication Date: 2021-06-04
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pressure sensors based on piezoelectric or friction principles on the market have a low output voltage, the signal is greatly disturbed, and it is difficult to detect and quantify pressure changes; most pressure sensors that can detect pressure changes require continuous power supply from an external power supply, which consumes a lot of power , is not conducive to the continuous work of the system

Method used

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  • Continuous monitoring flexible pressure sensor and composite film layer production method
  • Continuous monitoring flexible pressure sensor and composite film layer production method
  • Continuous monitoring flexible pressure sensor and composite film layer production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Such as image 3 As shown, when the sensor is used as an electronic skin or a pressure sensor for pressure detection, the sensor can quantify the detected pressure value by corresponding to the pressure and voltage in the range of 0-5N. When the contact area is 20mm*20mm, The change trend of the output voltage peak value with the pressure of 0.2-20N is obtained after fitting, which basically conforms to the formula

[0048] u (F) =a-b*c F As a result of (1), the fitting determination coefficient is 0.998, where a=8.87, b=8.32, c=0.89, according to the formula (1), the pressure detection value can be quantified, and the external force on the flexible electronic skin can be calculated , so as to realize the determination of the pressure value by the pressure sensor.

Embodiment 2

[0050] Such as Figure 4 As shown, when the sensor performs continuous pressure monitoring, three different forces (light touch, light pressure, heavy pressure) and periodic pressure are used to touch the electronic skin, and the detection output voltage of the three pressures is applied after touching the electronic skin , the three different forces have voltages of 1.1V, 1.6V, and 2.4V respectively. After pressing the electronic skin and pressing it periodically, the output voltage will also change periodically. The applied force can be calculated by formula (1). The forces are 0.16N, 0.28N, and 0.49N respectively, which are consistent with the actual pressing conditions and the measurement results. The above results fully prove that when touching the outside of the sensor, the sensor can realize continuous detection of pressure and can Different output and different voltage values ​​can meet the needs of daily pressure continuous detection and feedback. At the same time, th...

Embodiment 3

[0052] Such as Figure 5 As shown, when the pressure sensor is used for health monitoring, the pressure sensor is attached to the surface of the neck, the insulating material layer is in contact with the neck, and the pressure changes and muscle movements caused by the pulse and respiration act on the flexible pressure sensor electrode layer 1, so that the electrodes The composite film layer 2 under layer 1 is deformed, the output voltage produces a large peak voltage, and the pressure generated by the pulse action and the respiration action on the pressure sensor are different. The voltage value is between 1.2V-1.3V under the pulse action, and the respiration Under the action, the voltage value is about 1.6V, which can be distinguished. By monitoring the voltage amplitude and frequency, the monitoring of pulse, breathing and other physical health status can be realized.

[0053] The present invention utilizes the piezoelectric effect of polyvinylidene fluoride and silica gel,...

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Abstract

The invention relates to the technical field of flexible sensors, and discloses a continuous monitoring flexible pressure sensor and a composite film layer production method. The continuous monitoring flexible pressure sensor comprises electrode layers, composite film layers and elastic silica gel layers, and the two electrode layers are connected through the multiple composite film layers and one elastic silica gel layer, the composite film layer comprises a polyvinylidene fluoride film layer, the upper surface of the polyvinylidene fluoride film layer is coated with a conductive layer, and an insulating glue layer is further connected between the composite film layers; according to the invention, the laminated design of the multiple composite film layers is mainly adopted, and the cavities are designed in the composite film layers, so that the piezoelectric charge transfer effect is improved, the detection sensitivity can be improved, and the output voltage peak value is relatively high; the reduced graphene oxide conductive layer, the polyvinylidene fluoride film layer and the elastic silica gel layer have good flexibility, can be bent and deformed according to attachments, and can be used in the fields of robot electronic skin, wearable equipment and the like.

Description

technical field [0001] The invention relates to the technical field of flexible sensors, in particular to a continuous monitoring flexible pressure sensor and a production method for a composite film layer. Background technique [0002] In many occasions such as robot surface skin and wearable devices, it is required that the surface of the pressure sensor has the characteristics of low energy consumption, strong flexibility, strong anti-interference ability, and stable signal output. Pressure sensors based on piezoelectric or friction principles on the market have a low output voltage, the signal is greatly disturbed, and it is difficult to detect and quantify pressure changes; most pressure sensors that can detect pressure changes require continuous power supply from an external power supply, which consumes a lot of power , which is not conducive to the continuous operation of the system. Contents of the invention [0003] Aiming at the deficiencies in the prior art, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/16
CPCG01L1/16
Inventor 王志华赵钰玮张惠娟黎霞安金龙商建锋张良
Owner HEBEI UNIV OF TECH
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