A flexible pressure circular array sensor

Abstract

This utility model discloses a flexible circular pressure array sensor, comprising a substrate layer, piezoelectric units, a data module, and an encapsulation layer. The substrate layer is located below the sensor body. The piezoelectric units form the sensor body through an array structure, including a pressure-sensitive layer, longitudinal electrodes, transverse electrodes, and conductive patches. The data modules are located around the sensor body and include a longitudinal output module, a transverse output module, a longitudinal input module, and a transverse input module. The encapsulation layer is located above the sensor body. The substrate layer, piezoelectric units, data module, and encapsulation layer together constitute the flexible circular pressure array sensor. This utility model, through the design of flexible sensing materials and a circular array structure, can achieve complex curved surface bonding and uniform pressure mapping, exhibiting advantages such as high strength, high tensile strength, and high sensitivity.

Description

Technical Field

[0001] This utility model relates to the field of flexible sensing technology, and in particular to a flexible pressure circular array sensor. Background Technology

[0002] With the development of flexible electronics technology and the maturity of array-based information processing technology, flexible pressure circular array sensors, which have excellent mechanical properties, high spatial resolution and high sensitivity sensing, have broad application prospects as an intelligent information carrier in fields such as biomechanical analysis, medical rehabilitation diagnosis and wearable monitoring devices.

[0003] Currently, traditional array sensors have numerous applications in fields such as pressure detection, but their inherent limitations restrict their application in many emerging fields. These main drawbacks include: limitations in spatial structure and arrangement—rectangular array sensing units are arranged regularly in the horizontal and vertical directions, making it difficult to adapt to the isotropic pressure distribution of non-rectangular contour objects; limitations of rigid substrates—rigid circuit boards and other materials cannot be bent, making it difficult to conform to complex curved surfaces such as human skin, leading to measurement distortion; and insufficient sensitivity and spatial resolution—traditional structures lack high-density array design, making it difficult to achieve precise pressure distribution mapping, resulting in limited sensitivity and other problems.

[0004] Therefore, traditional array sensor technology needs to be improved and enhanced. Utility Model Content

[0005] The purpose of this invention is to provide a flexible pressure circular array sensor that solves or partially solves the above-mentioned problems.

[0006] This utility model is achieved through the following technical solution:

[0007] A flexible circular pressure array sensor includes: a substrate layer, a piezoelectric unit, a data module, and an encapsulation layer. The substrate layer is made of a flexible material and is used to support and fix the sensor body. The piezoelectric unit includes a pressure-sensitive layer, a longitudinal electrode, a transverse electrode, and a conductive patch. The pressure-sensitive layer is made of conductive hydrogel and is used to convert external pressure signals into sensor electrical signals. The data module is composed of a bundle of metal wires and includes a longitudinal input module, a transverse input module, a longitudinal output module, and a transverse output module for connecting circuits and outputting data signals. The encapsulation layer is made of a flexible material and is used to encapsulate the sensor body.

[0008] According to this utility model, preferably, the number of piezoelectric units is 32, which are arranged in a grid to form an array structure.

[0009] According to this utility model, preferably, the array structure of the piezoelectric unit is circular.

[0010] According to this utility model, preferably, the number of data modules is four, including a vertical output module, a horizontal output module, a vertical input module, and a horizontal input module.

[0011] According to this utility model, preferably, the data modules are located on the upper, left, lower, and right sides of the sensor body.

[0012] According to this utility model, preferably, the thickness of the base layer is 1.0-2.0 mm.

[0013] According to this utility model, preferably, the thickness of the encapsulation layer is 0.5-1.5mm.

[0014] According to this utility model, preferably, the thickness of the pressure-sensitive layer is 2.4-3.6 mm.

[0015] According to this utility model, preferably, the diameter of the base layer and the encapsulation layer is 12-18 cm.

[0016] According to this utility model, preferably, the base layer and the encapsulation layer are made of composite gel, plastic, silicone rubber or fiber substrate.

[0017] According to this utility model, preferably, the pressure-sensitive layer is made of polyimide-based hydrogel, polyurethane-based hydrogel, or PVA-PA-A-Fe. 3+ Hydrogel.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. The flexible pressure circular array sensor provided by this utility model uses a flexible material as the base layer, which can easily fit irregular curved surfaces such as human skin and robot joints without stress concentration and falling off. It can be applied to wearable health monitoring, robot tactile perception and curved structure health monitoring and other fields.

[0020] 2. The array structure of the flexible pressure circular array sensor provided by this utility model consists of multiple piezoelectric units arranged in a circle on a two-dimensional plane. Due to the rotational symmetry of the circular array, the detection of isotropic pressure distribution is more natural and uniform, and it can provide a more detailed pressure distribution image within the region.

[0021] 3. The flexible pressure circular array sensor provided by this utility model uses advanced flexible material composite hydrogel as pressure sensing material. When external pressure is applied, the microstructure of the hydrogel changes significantly. By introducing a variety of modified materials, its response to small pressures can be enhanced, achieving high-sensitivity sensing. Attached Figure Description

[0022] Figure 1This is a top view of a flexible pressure circular array sensor according to this utility model.

[0023] Figure 2 This is a schematic diagram of the layered structure of a flexible pressure circular array sensor according to this utility model.

[0024] Figure 3 This is a schematic diagram of the main structure of a flexible pressure circular array sensor according to this utility model.

[0025] Figure 4 This is a schematic diagram of the piezoelectric unit structure of a flexible pressure circular array sensor according to this utility model.

[0026] In the diagram, 1 is the base layer; 2 is the pressure-sensitive layer; 3 is the conductive patch; 4 is the vertical electrode; 5 is the horizontal electrode; 6 is the vertical output module; 7 is the horizontal output module; 8 is the vertical input module; 9 is the horizontal input module; and 10 is the encapsulation layer. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] Example 1

[0029] like Figure 1 , 2 As shown, a flexible pressure circular array sensor includes, from bottom to top, a base layer 1, a piezoelectric unit, a data module, and an encapsulation layer 10. The piezoelectric unit is located above the base layer 1 and includes a pressure-sensitive layer 2, a conductive patch 3, a longitudinal electrode 4, and a transverse electrode 5. The data module includes a longitudinal output module 6, a transverse output module 7, a longitudinal input module 8, and a transverse input module 9, which are located on the top, left, bottom, and right sides of the sensor body, respectively.

[0030] The base layer 1 has a thickness of 1.0 mm and a diameter of 15 cm; the encapsulation layer 10 has a thickness of 1.0 mm and a diameter of 15 cm; and the pressure-sensitive layer 2 has a thickness of 3.0 mm.

[0031] The base layer 1 is made of composite gel; the encapsulation layer 10 is made of composite gel; and the pressure-sensitive layer 2 is made of PVA-PAA-Fe. 3+ Hydrogel.

[0032] Example 2

[0033] like Figure 3As shown, the main structure of a flexible pressure circular array sensor consists of 32 piezoelectric units arranged in a circular array, 4 data modules located around the perimeter, and a base layer 1 located at the bottom.

[0034] like Figure 4 As shown, the piezoelectric unit of a flexible circular pressure array sensor consists of a pressure-sensitive layer 2, a conductive patch 3, a longitudinal electrode 4, and a transverse electrode 5. The pressure-sensitive layer 2 is made of PVA-PAA-Fe. 3+ Hydrogels. By introducing PVA and PAA into the hydrogel system to form a double network structure, higher strength and toughness are achieved, while combining Fe... 3+ The addition of [a specific ingredient] further improves its conductivity and sensitivity.

[0035] When external pressure is applied to the sensor surface, the hydrogel is compressed, increasing the density of its internal ion channels and shortening the ion migration path, thus increasing ion conductivity and ultimately reducing the resistance. The pressure-sensitive layer 2 converts the external pressure signal into an electrical signal, which is then transmitted through the conductive patch 3 to the longitudinal electrode 4 and the transverse electrode 5. This signal further flows through wires to the longitudinal output module 6 and the transverse output module 7. Connecting to data analysis equipment completes the row and column scanning signal acquisition and polar coordinate data processing, ultimately outputting a high-precision dynamic image of the pressure distribution in the sensing area, thus completing the pressure sensing function.

Claims

1. A flexible pressure circular array sensor, characterized in that, It consists of a substrate layer, a piezoelectric unit, a data module, and an encapsulation layer; the piezoelectric unit forms the sensor body through an array structure, including a pressure-sensitive layer, a longitudinal electrode, a transverse electrode, and a conductive patch.

2. The flexible pressure circular array sensor as described in claim 1, characterized in that, The base layer is located below the sensor body, and the encapsulation layer is located above the sensor body.

3. The flexible pressure circular array sensor as described in claim 1, characterized in that, The piezoelectric units consist of 32 units arranged in a grid to form an array structure.

4. A flexible pressure circular array sensor as described in claim 3, characterized in that, The array structure of the piezoelectric units is circular.

5. A flexible pressure circular array sensor as described in claim 1, characterized in that, The number of data modules is four, including a vertical output module, a horizontal output module, a vertical input module, and a horizontal input module, which are located on the top, left, bottom, and right sides of the sensor body, respectively.

6. A flexible pressure circular array sensor as described in claim 1, characterized in that, The thickness of the base layer is 1.0-2.0 mm.

7. A flexible pressure circular array sensor as described in claim 1, characterized in that, The thickness of the encapsulation layer is 0.5-1.5 mm.

8. A flexible pressure circular array sensor as described in claim 1, characterized in that, The thickness of the pressure-sensitive layer is 2.4-3.6 mm.

Images