Piezoresistive flexible sensor based on visual electrical impedance tomography technology and its manufacturing method
A flexible sensor and tomographic imaging technology, which is applied in the measurement of the property and force of piezoelectric resistive materials, can solve the problem of the inability to realize the accurate positioning of the perceived pressure of multi-point touch, the difficulty of realizing large-area detection, and the limitation of development and application. and other problems, to achieve the effect of improving sensitivity and response time, simple structure and improving performance
Active Publication Date: 2021-08-06
苏州健通医疗科技有限公司
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Problems solved by technology
[0004] Although piezoresistive flexible sensors made of the above materials have excellent ductility, their development and application are limited due to low sensitivity and insufficient response.
In addition, this type of sensor currently mainly uses arrayed sensing elements to detect pressure distribution. Although it can adapt to complex surfaces with a certain size, it is difficult to achieve large-area detection and cannot realize multi-touch perception. and accurate positioning of the applied pressure
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[0045] The present invention will be further described below in conjunction with the accompanying drawings.
[0046] Based on the electrical impedance tomography technology, the present invention designs a "sandwich structure" piezoresistive flexible sensor, which has the characteristics of simple structure, visualized pressure position, high sensitivity and fast response time.
[0047] Such as figure 1 As shown, the realization of the present invention includes three parts, the first is the design of the piezoresistive flexible sensor, the second is to collect the signal through the electrical impedance tomography hardware system, and the collected signal is processed, and finally through the image reconstruction structure to visualize where pressure is applied. The flexible tactile sensor of the present invention, based on the piezoresistive effect and combined with the signal acquisition system, converts the pressure signal into a voltage signal, and then solves the invers...
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The invention discloses a piezoresistive flexible sensor based on visualized electrical impedance tomography technology and a manufacturing method thereof, belonging to the technical field of flexible pressure sensors. The piezoresistive flexible sensor includes upper and lower isolation layers using PDMS flexible films, and a piezoresistive layer of Ag / MWCNTs / PDMS flexible conductive composite material between the upper and lower isolation layers. The Ag / MWCNTs / PDMS films were assembled face-to-face, and eight rectangular electrodes were evenly distributed on one side of the piezoresistive layer. The rectangular electrode is connected to the electrical impedance tomography system through wires to realize signal acquisition; the collected signal is passed through the image reconstruction algorithm to realize the visual measurement of the applied pressure. The invention can improve the sensitivity of the piezoresistive flexible sensor, reduce the response time, realize the measurement of the magnitude and position of the applied pressure, and can be used in the field of large-area and deformable detection.
Description
Technical field: [0001] The invention relates to a piezoresistive flexible sensor based on visualized electrical impedance tomography technology and a manufacturing method thereof, belonging to the technical field of flexible pressure sensors. Background technique: [0002] With the continuous development of sensor technology, flexible pressure sensors can be used to detect physiological parameters, motion postures, and environmental characteristics, and have great potential in bioelectricity, human health monitoring, and bionic electronic skin. Compared with traditional metal and semiconductor material sensors, flexible sensors have the advantages of good flexibility, stretchability and continuous monitoring. For practical applications, flexible pressure sensors require not only superior ductility, but also high sensitivity and fast response. [0003] Based on different detection principles and methods, pressure sensors are mainly divided into capacitive, piezoelectric, st...
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IPC IPC(8): G01L1/18
CPCG01L1/18
Inventor 刘凯王欢李芳吴阳王松张政赵通通姚佳烽
Owner 苏州健通医疗科技有限公司