Elastic array pressure sensor

Abstract

The invention discloses an elastic array pressure sensor, which applies an elastic conductive fiber technology to an array pressure sensor to realize a technology of detecting pressure under the condition of large deformation. According to the invention, the elastic conductive yarns are arranged on two sides of the sensing layer as electrodes and are sewn on the sensing layer, and the sensing layer is made of conductive cloth, so that the whole sensor is lighter, thinner and softer; according to the preparation method of the elastic conductive yarn, existing spinning equipment and a mature ring spinning process are used, the manufacturing process is simple, the cost is low, and large-scale production is easy to achieve; according to the elastic conductive yarn, when the elastic conductiveyarn is dynamically stretched, the conductive core-spun yarns spirally wound on the outer sides of the elastic fiber filaments are insulated from one another and can extend in the direction of the elastic fiber filaments, the effective conductive length of the elastic conductive yarn is kept unchanged, the resistance value is stable and unchanged, and meanwhile the requirements for flexibility andstretchability are met.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to an elastic array pressure sensor. Background technique [0002] With the continuous progress in the fields of flexible electronics, smart nanomaterials, and micro-nano manufacturing, flexible pressure sensors with the characteristics of thinness, portability, bendability, excellent electrical performance, and high integration are widely used in soft robots, medical devices, and wearable devices. And other fields have shown great application prospects, and it is one of the most concerned sensor technologies. In the current application process, higher requirements are placed on the elastic performance of the flexible array pressure sensor, that is, the sensor can work normally under large tensile deformation. [0003] Most of the existing flexible array sensors are resistive. For example, the patent application number 201210265123.9 proposes a pressure distribution detection devic...

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Problems solved by technology

[0003] Most of the existing flexible array sensors are resistive. For example, the patent application number 201210265123.9 proposes a pressure distribution detection device, which mainly includes a flexible array sensor unit composed of a sensor array, a signal conditioning and data acquisition unit, and a data display and analysis unit. Three parts, the flexible array sensor unit is sequentially connected to the signal conditioning and data acquisition unit and the data display and analysis unit; the flexible array sensor unit is composed of a sensor array and a Wheatstone bridge circuit, wherein the sensor array is composed of sensor nodes, and each sensor node Corresponding to a strain gauge, the strain gauge is a metal foil type resistance strain gauge; the strain gauges are arranged in rows and columns to form a sensor array; but the strain gauge is thick and not flexible enough, so it is easy to disengage from the flexible substrate when rubbing, and cannot Suitable for occasions that require greater flexibility

[0004] In addition, someone prepared a pressure-sensitive composite material made of carbon black / silicone rubber, and obtained a flexible pressure sensor with a quadrangular pyramid structure by transferring the 3D printed microstructure template pattern; using the printing process to directly print the pressure sensor, the sensor made by this technology It can realize the perception of pressure and is suitable for large-area integration applications. However, in the case of large tensile deformation, the printed conductive silver paste is easy to fall off, which affects the use effect of the sensor.

[0005] Although the electrodes of the flexible array pressure sensor made of high-conductivity conductive cloth can be made relatively soft, in the case of large stretching deformation, the conductive fibers in the electrodes may be broken, and the inside of the conductive cloth may be broken. The resistance of the conductive fiber will change with the stretching deformation, which will affect the use effect

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