Journal
SMART MATERIALS AND STRUCTURES
Volume 31, Issue 9, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-665X/ac7dcf
Keywords
three-dimensional force; tactile sensor; inverted pyramid structure; high sensitivity; wearable electronics
Funding
- National Natural Science Foundation of China [61901005]
- China Central Government Guide Local Special Funds for Scientific and Technological Development [202107d08050012]
- China Postdoctoral Science Foundation [2021M690994]
- Anhui Provincial Natural Science Foundation [1908085QF261, 2108085QE222]
- Anhui Provincial Postdoctoral Science Foundation [2021B539]
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This study presents a highly sensitive 3D force tactile sensor based on capacitance, which is verified by finite element simulation and fabricated using low-cost 3D printing technology. The sensor demonstrates high sensitivity and reliability, making it suitable for applications such as robotic control and gaming, and confirming its feasibility for use as e-skin.
To improve the haptic sensing performance of electronic skin (e-skin), this study designed a capacitance-based highly sensitive three-dimensional (3D) force tactile sensor with an inverted pyramidal structure with high electrical stability and mechanical repeatability. The working mechanism of the sensor was verified by finite element simulation, and it was fabricated by low-cost 3D printing technology and layer-by-layer self-assembly process. A capacitive signal acquisition system and an application test platform were constructed. The results revealed that the proposed 3D-force tactile sensor had a normal force sensitivity of 0.551 N-1 at 0-7 N and 0.107 N-1 at 7-35 N. The results for tangential force were 0.404 N-1 at 0-4 N and 0.227 N-1 at 4-14 N, with a low hysteresis of 4.17% and a fast response/recovery time of 56/30 ms. High sensitivity and reliability of the device were demonstrated experimentally. The proposed capacitive flexible 3D-force haptic sensor can be used in applications such as robotic gripping, gamepad control and human motion detection, and its feasibility for application as e-skin was confirmed.
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