| Carbon fillers based conductive polymer is a new research direction in the field of sensitive materials and sensor technology. Problems like flexibility, wide-ranged pressure sensing and high stability of flexible tactile sensor were emphatically solved, which has practical significance for tactile sensors applications in the robot electronic bionic skin, sports wearable devices and human body tactile assistance system.For conductive rubber composite material, the distribution state of conductive fillers in silicone rubber matrix, conductive network and mechanical network composed by conductive fillers was analyzed. The percolation phenomenon and conduction mechanism, piezoresistive effect and electrical characteristics of material was analyzed. Combining theory and experiment, the influence on the pressure sensing range and sensitivity of the composite materials of the conductive filler type, doped modified material, hybrid conductive fillers and improved preparation process was studied.A multi-layered flexible tactile sensor for wide-ranged pressure measurement based on CB/CNTs/SR composite was put forward in this paper. The design proposal and preparation method of the sensor was described. By contact model, the variation law of geometric contact area and electrical contact area caused by micro structure contact deformation was analyzed. Further, the synergistic sensing mechanism of pressure -volume resistance and pressure - contact resistance was analyzed. To study the influence on the sensor characteristics, different geometry parameters were set, and further optimization of the sensor structure was put forward.Based on this sensor, signal acquisition and processing system was designed, the environmental factors interference and plantar pressure measurement was studied. Experimental results show that the flexible tactile sensor has the advantages of simple preparation process, low temperature interference, and can achieve good perception of wide-ranged pressure. |
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