Tactile sensor detects pressure and stickiness separately in real time
A robust single-sensing-element tactile sensor for concurrent pressure and tackiness detection with real-time signal decoupling capability
Robotics
Summary
Robots need to feel not only pressure but also how sticky something is to better understand and handle objects. The authors designed a sensor that uses a magnet and a Hall effect sensor inside a soft material to do this with just one sensing element. When pressed, the surface indents and when pulled off sticky surfaces, it bulges, changing the sensor readings. This allows the robot to tell apart pressure from stickiness instantly and accurately, improving how it interacts with sticky or soft things.
What this means in practice
- •For robotics engineers: Equip humanoid robots with one sensor that accurately and simultaneously measures pressure and stickiness at the same contact spot.
- •For quality control teams: Monitor aging and adhesive properties of rubber materials by sensing mechanical and tackiness changes precisely.
Authors
Ying Yang, Mingwei Gu, Jia-Sen Xie, Xingyu Ma, Yan-Na Lu, Lin Zheng, Jinhui Gu, Junshuai Chen, Yunjie Lu, Denys Makarov, Jin Ge
Abstract
Integrating tackiness sensation into the artificial skin of humanoid robots significantly enhances their cognitive and operational capabilities. However existing tactile sensors face challenges in decoupling of the multimodal signal and stability. Here we present a surface-soft tactile sensor that incorporates a Hall effect sensor and a soft magnetic composite within a robust elastic framework. The sensor surface indents under pressure and bulges prominently when retracted from sticky surfaces dynamically altering the Hall sensor-magnet distance. This generates whole-process-traceable and baseline-separated signals enabling real-time differentiation between pressure and pull-off force. This single-sensing-element design facilitates bimodal sensing at the same contact spot while eliminate stress cross-talk enhancing both accuracy and sensitivity. The fusion of a robust framework and magneto-mechanical sensing mechanism equips the sensor with exceptional reliability and excellent signal baseline stability. This tactile sensor holds substantial potential for advancing robotic capabilities in evaluating adhesive properties monitoring rubber aging precisely handling lightweight objects and cognizing natural objects surface characteristics.