Mr. Peng Wang Profile

Peng Wang

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Proceedings Article | 16 August 2023 Paper

Implementation and evaluation of a soft tactile sensor using electrical impedance tomography

Peng Wang, Haibin Liu, Leizhi Jin, Ying Chen

Proceedings Volume 12787, 1278702 (2023) https://doi.org/10.1117/12.3004568

KEYWORDS: Sensors, Composites, Electrical conductivity, Piezoresistivity, Image restoration, Tomography, Electrodes, Compliance, Polymers, Image processing

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Compliant tactile sensing has received increasing interests in human-robot interactions and soft robotic sensing. However, it is still challenging to achieve high sensing performance over an area with low wiring complexity. This paper is to implement and evaluate a soft, distributed sensor that is enabled by the technique of electrical impedance tomography (EIT), which allows areal sensing using only boundary measurements. To achieve mechanical compliance of the sensor, a functional natural rubber composites filled with exfoliated graphite (EG/NR) is fabricated by spray coating. Long-term stability of the sensing material is evaluated under cyclic tests, and a high gauge factor of 6.25 is obtained, which can be explained from the evolution of the micromorphology under strain. A continuous sensing area with a diameter of 12 cm is prepared, and 16 electrodes are attached along the periphery to implement distributed sensing. The performance of the sensor is characterized under indentation tests. Results show that the intensity sensitivity monotonically decreases with the distance to the boundary, and consistent response is obtained along all the radial directions, providing predictable performance over the sensing area.

Proceedings Article | 18 July 2023 Paper

Design and evaluation of flexible sensors with enhanced sensitivity based on piezoresistive polymer composites

Peng Wang, Ying Chen, Haibin Liu

Proceedings Volume 12744, 1274420 (2023) https://doi.org/10.1117/12.2688897

KEYWORDS: Sensors, Piezoresistivity, Design and modelling, Composites, Polymers, Electrical conductivity, Polymeric sensors, Resistance, Graphite, Piezoresistive sensors

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Flexible sensors with high sensitivity have shown great potentials in applications such as human motion detection and wearable electronic devices. In this paper, we propose a design of flexible piezoresistive sensors with hole structures that exhibit enhanced sensitivity. The hole structures re-arrange the strain distribution under tensile loadings, and the resulting non-uniform strain distribution amplifies the overall resistive response. The underlying mechanism of the enhanced sensitivity is based on the nonlinear piezoresistive behavior of conductive polymer composites under large strains. Simulation studies accounting for the nonlinear piezoresistivity are performed to investigate the influence of the aspect ratio of an elliptical hole structure on the sensor’s sensitivity. Results show that the design of hole structures increases the piezoresistive response, and a higher sensitivity can be achieved at a smaller aspect ratio. To experimentally validate the design, sensors that are made of exfoliated graphite polymer composites with an elliptical hole of different aspect ratios are prepared and characterized. Results show that the strain sensitivity reaches 7.65 when the aspect ratio decreases to 0.1, improved by two folds compared with the control sample. To demonstrate the performance in monitoring human motions, sensors with and without hole structures are attached on the finger and the wrist to detect the bending and relaxing motion, and enhanced sensitivity is also obtained from the structure with a low aspect ratio. This work provides an effective approach to improve the sensitivity of flexible sensors that are made of piezoresistive polymer composites.

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