Development And Application Of Distributed Flexible Strain Sensors Based On Graphen

Strain sensors held significant importance in numerous application scenarios,such as robots,smart wearable devices,health monitoring,and other fields.They were utilized to monitor the deformation and stress distribution of objects in real time.However,the existing strain sensors exhibited many deficiencies in terms of measurement range,sensitivity,bending adaptability,and anti-interference capability.Addressing these challenges,this paper has proposed a graphene-based distributed flexible strain sensor.By utilizing the mechanical and electrical properties of graphene,the measurement range,linearity,and stability of the sensor have been greatly improved.The preparation materials and structural design of the sensor have been studied in depth in this paper,with the main research content as follows:Firstly,in terms of materials,reduced graphene oxide(RGO)and polydimethylsiloxane(PDMS)have been selected as the materials for preparing the sensor,and their properties have been measured and analyzed.The effect of RGO concentration on the sensor performance has been investigated,and the influence of carbon nanotubes(CNTs)on the sensor performance has been further explored.The experimental results have indicated that when the concentration of RGO is 1 mg/ml,the sensitivity is the highest and stability is better;the performance of the sensor has been greatly improved by adding an appropriate amount of CNT.Secondly,in terms of structure,the structure of the sensing unit has been optimized through COMSOL finite element simulation,proposing the micro-pyramid structure of the upper substrate and the spiral microstructure of the middle sensing layer.Based on this,the distributed flexible strain sensor has been successfully prepared,and a three-axis mobile measurement platform has been designed.The performance of this design has been measured and analyzed through experiments.The results show that the sensor has a z-direction gauge coefficient of approximately 4.3,a fast response capability of 30ms,and a very high linearity(R~2=0.99132).Finally,a contact force measurement platform has been constructed to explore the detection performance of the sensor under flat loading conditions and the performance change rule under curved surface loading.The sensor has been applied to manipulator experiments,verifying the detection capability of the sensor under the action of contact position and three-dimensional space force through a grasping test.