期刊
SOFT ROBOTICS
卷 9, 期 1, 页码 119-127出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/soro.2020.0051
关键词
tactile sensor; parasitic capacitance free; flexible sensor; wearable; pressure sensor; proximity
类别
资金
- Convergence Technology Development Program for Bionic Arm through the National Research Foundation (NRF) ofKorea funded by theMinistry of Science, ICT and Future Planning [2014M3C1B2048177]
- Basic Research Program of Korea Institute of Machinery and Materials [NK244C]
This study introduces a parasitic capacitance-free tactile sensor with a floating electrode, capable of identifying actual physical contact pressure in sensor arrays. Experimental results show high sensitivity and negligible hysteresis in response to a wide range of pressure.
In this study, a parasitic capacitance-free tactile sensor with a floating electrode that is capable of identifying actual physical contact pressure by distinguishing from parasitic effects and applicable to sensor arrays is presented. Although capacitive pressure sensors are known for their excellent pressure sensing capabilities in wide range with high sensitivity, they tend to suffer from a parasitic capacitance noise and unwanted proximity effects. Electromagnetic interference shielding was conventionally used to prevent this noise; however, it was not entirely successful in multicell array sensors. Parasitic capacitance-free method involves the use of a floating electrode, which functions as a contact trigger by causing sudden changes in capacitance only when the actual physical contact pressure has been applied or removed. The proposed method is robust, consistent, and precise. Experimental results show a wide range of pressure response up to 2.4 MPa with a sensitivity of 0.179 MPa-1 (up to 0.74 MPa) and negligible hysteresis.
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