Development And Application Of Pressure Distribution Visualization System Based On Hierarchical Structures Flexible Pressure Sensor Array

With the development of contemporary technology,pressure distribution visualisation systems based on flexible pressure sensor arrays have received significant attention from researchers.As a new type of electronic device,flexible pressure sensors can be attached to various irregular surfaces and have good mechanical and electrical properties,which are of great importance in the fields of sports,health care and human-computer interaction.When a flexible pressure sensor is subjected to external pressure,data acquisition,processing,analysis and real-time display can be achieved through a pressure distribution visualisation system,providing important applications in the practical use of flexible pressure sensors.The development of a visualisation system for measuring,analysing and displaying the external pressure distribution in real time is therefore of great theoretical research and practical application value.This paper develops a flexible pressure sensor array based on a hierarchical structures,which can detect external pressure stimuli with high accuracy and efficiency;designs a signal conditioning circuit based on this flexible pressure sensor array to process the piezoresistive signals from the sensor array;designs a data acquisition card on this basis to further process and transmit the electrical signals;uses Lab VIEW software to design the upper computer system to The system is designed using Lab VIEW software to realise the functions of signal processing and real-time display,and the plantar pressure distribution test experiment is designed to verify the feasibility of the whole pressure distribution visualisation system.The following is a detailed description of the main results of this paper:1.In this paper,a piezoresistive flexible pressure sensor based on a hierarchical structures was prepared by a micro-nanoimprinting process and a pre-strain forming process;the electrical properties of the flexible pressure sensor were characterised to obtain sensitivity of 8.87 kPa-1,maximum withstand pressure of 60 kPa,minimum detectable pressure<1 Pa and response time of 70 ms.2.In this study,a signal conditioning circuit is designed for the flexible pressure sensor array,using a row-scan circuit to collect the electrical signal of the sensor;an amplification module is designed to amplify the weak electrical signal of the sensor;a regulated power supply circuit is designed to ensure the stability of the circuit and the accuracy of signal acquisition;and data acquisition card parameters are designed to achieve electrical signal processing and effective output.3.Lab VIEW software is used to design the upper computer software system,the whole upper computer software system includes data acquisition module,data processing module,data display module and data storage module.The software system is used to acquire the pressure signal;the signal filter is designed to smooth the signal;finally,the processed data is saved and interpolated separately to visualise the sensor pressure signal in the form of a stress cloud.4.The plantar pressure distribution test experiment was designed to verify the feasibility of the system.Integrating the flexible pressure sensing array,signal acquisition hardware system and software system in this paper to form a pressure distribution visualisation system;through stress cloud map and data analysis,the stresses on various regions of the human foot under different gait were explored,and the results show that the pressure distribution visualisation system developed in this paper can achieve accurate measurement of human plantar pressure,verifying the feasibility of this system.