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| Three Dimensional Force Sensor for Biomechanical Measurement Based on Capacitance Principle |
| YANG Shu-yan,SUN Dong-jie,LI Dan-ruo,SONG Ai-guo |
| School of Instrument Science and Engineering, Southeast University, Nanjing, Jiangsu 210018, China |
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Abstract To realize biomechanical measurement, a capacitive three dimensional force sensor was developed with low temperature drift and low power consumption. A novel structure of the elastomer was designed, and the polyurethane foam was used as the medium. The sensor can perceive the force components of three dimensions and convert them into capacitance changes of three channels simultaneously. After finite element simulation used ANSYS, the size of the sensor was determined, and the measuring range of each dimension reached ±200N with safety overload more than 150%. A measurement system composed of capacitor acquisition module and signal processing module was designed. The integration design made the calculation and output of measurement data real-time. In addition, to decrease the impact of the hysteresis effect and the inter-dimensional coupling, the hysteresis compensating and decoupling model was established. The experiment results show that the Class I Error is below 2.8% while the Class II Error is below 4.6%.
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Received: 16 July 2019
Published: 20 April 2021
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2021, Vol. 42 
