Research On Flexible Tactile/pressure Sensor Based On Three-dimensional Skeleton Structure

In the development of intelligent robots,flexible electronic skin plays an important role in human society.The electronic skin touch/pressure sensor can accurately sense the pressure information of the contacted object,and meanwhile realize the tactile perception function for flexible wearable devices,possess important significance in fields of soft robots,health and human-computer interaction.Aiming at a series of problems in the current flexible pressure/tactile sensor field,such as complex preparation process,flexible and sensitive performance,the composite conductive material based on three-dimensional porous microstructure was studied.For the development of new tactile sensors,it has a good practical significance for the application of contacted object information monitoring and tactile perception.This work selects highly flexible and elastic three-dimensional porous sponge as the matrix,and uses layer-by-layer dip coating process to realize the organic combination of sensitive materials and flexible matrix to prepare pressure sensitive materials based on CB/MWCNTs/SR composites.Through matrix pore size and thickness design,analysis of group distribution ratio of conductive sensitive materials and preparation process,combined with microscopic analysis methods,the influence of various parameters on the conductive mechanism and pressure sensitive properties of conductive sponge was analyzed.A flexible tactile sensor based on the composites with high sensitivity,good reproducibility and fast response is prepared,and sensing characteristics of the sensor are tested and optimized.The signal extraction and display methods of pressure/tactile sensing arrays are studied.For the application of contacted object detection and tactile perception,a sensing array with touch/pressure sensing function is constructed to realize the distribution of plantar pressure distribution,and a flexible electronic skin based on touch/pressure sensor is designed to study the application of human activity monitoring and identification.The results show that the flexible touch/pressure sense information sensing system can be applied to human activities and real-time health monitoring,which is of great significance for the development of human-computer interaction and flexible wearable sensing.