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Wang, Yancheng; Wu, Xin; Mei, Deqing; Zhu, Lingfeng; Chen, Jianing
Sensors and actuators. A. Physical., 10/2019, Letnik: 297Journal Article
Display omitted •A novel wearable tactile sensor array with spatial resolution of 3.5 mm for three-axis distributed contact force sensing is developed.•The tactile sensor array features high flexibility and can be easily worn on robotic hand for grasping applications.•Both robotic grasping contact force sensing and slip detection can be achieved by the developed tactile sensor array.•A methodology to determine the threshold values for slip detection is developed. Distributed tactile information sensing is crucial for the stable grasping and manipulation of intelligent robotics. This paper presents a flexible tactile sensor array with spatial resolution of 3.5 mm that can be easily worn on the robotic hand for distributed three-axis contact force sensing in grasping applications. The proposed tactile sensor array has 3 × 3 sensing units, each unit has a five-electrode pattern’s design and using conductive rubber as the sensing material. The fabricated prototype of the tactile sensor array has good flexibility, and its performance is characterized with high sensitivities: 0.471 V/N in x-axis and 0.466 V/N in y-axis. As for z-axis, the sensitivities are 0.201 V/N at 0˜6 N and 0.067 V/N at 6˜15 N measurement ranges. Then the tactile sensor array and its scanning circuit are integrated into the robotic hand for distributed three-axis contact force perception when grasping different objects. By using discrete wavelet transform analysis, the threshold values of wavelet coefficients for slip detection can be determined, and the slippage during robotic grasping of objects can be successfully detected. Therefore, the developed flexible tactile sensor array has the ability of detecting distributed contact forces and slippage simultaneously, and could be used for robotic dexterous grasping and manipulations.
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