Analysis and optimization of fully foam-based capacitive sensors

This paper presents the electromechanical analysis of ultra-light and highly compressible capacitive pressure sensors based on open-cell foams, with top and bottom surface electrodes built by PEDOT:PSS coating. Multiple samples of porous capacitive sensors were characterized, and experimental results were compared by means of both FEM simulations and theoretical analysis. The agreement between experiments and theoretical/numerical prediction is good, suggesting that this methodology can be a useful tool for fine tuning of the sensor performance (i.e. sensitivity, range) for specific applications. Finally, the proposed foam sensor provides a low-cost, easy-to-implement, robust sensing solution for real-world applications in robotics and wearable systems.

[1]  Massimo Totaro,et al.  Toward Perceptive Soft Robots: Progress and Challenges , 2018, Advanced science.

[2]  Massimo Totaro,et al.  Integrated Simultaneous Detection of Tactile and Bending Cues for Soft Robotics. , 2017, Soft robotics.

[3]  Massimo Totaro,et al.  Soft Smart Garments for Lower Limb Joint Position Analysis , 2017, Sensors.

[4]  Mark R. Cutkosky,et al.  Force and Tactile Sensors , 2008, Springer Handbook of Robotics.

[5]  Xiaochen Dong,et al.  Recent progress of flexible and wearable strain sensors for human-motion monitoring , 2018 .

[6]  Yichun Ding,et al.  Flexible and Compressible PEDOT:PSS@Melamine Conductive Sponge Prepared via One-Step Dip Coating as Piezoresistive Pressure Sensor for Human Motion Detection. , 2018, ACS applied materials & interfaces.

[7]  S. Mezghani,et al.  Parameter Estimation of a Hyperelastic Constitutive Model for the Description of Polyurethane Foam in Large Deformation , 2013 .

[8]  Dipti Gupta,et al.  Low cost sponge based piezocapacitive sensors using a single step leavening agent mediated autolysis process , 2018 .

[9]  Wei Zeng,et al.  Rapid-Response, Low Detection Limit, and High-Sensitivity Capacitive Flexible Tactile Sensor Based on Three-Dimensional Porous Dielectric Layer for Wearable Electronic Skin. , 2019, ACS applied materials & interfaces.

[10]  Octavian Postolache,et al.  Tactile Sensors for Robotic Applications , 2013 .

[11]  Massimo Totaro,et al.  Electromechanical behavior of soft porous capacitive sensors , 2018, 2018 IEEE International Conference on Soft Robotics (RoboSoft).

[12]  H. Fong,et al.  Recent Advances in Flexible and Wearable Pressure Sensors Based on Piezoresistive 3D Monolithic Conductive Sponges. , 2019, ACS applied materials & interfaces.

[13]  Irene Bernardeschi,et al.  Developing Reliable Foam Sensors with Novel Electrodes , 2019, 2019 IEEE SENSORS.

[14]  TotaroMassimo,et al.  Integrated Simultaneous Detection of Tactile and Bending Cues for Soft Robotics. , 2017 .

[15]  Benjamin C. K. Tee,et al.  Transparent, Optical, Pressure‐Sensitive Artificial Skin for Large‐Area Stretchable Electronics , 2012, Advanced materials.

[16]  Giancarlo Canavese,et al.  Flexible Tactile Sensing Based on Piezoresistive Composites: A Review , 2014, Sensors.

[17]  L. Beccai,et al.  Flexible Three‐Axial Force Sensor for Soft and Highly Sensitive Artificial Touch , 2014, Advanced materials.

[18]  Hongbo Wang,et al.  Design Methodology for Magnetic Field-Based Soft Tri-Axis Tactile Sensors , 2016, Sensors.

[19]  Canhui Lu,et al.  Large‐Area Compliant, Low‐Cost, and Versatile Pressure‐Sensing Platform Based on Microcrack‐Designed Carbon Black@Polyurethane Sponge for Human–Machine Interfacing , 2016 .

[20]  Zheng Wen,et al.  Influence of the pore size on the sensitivity of flexible and wearable pressure sensors based on porous Ecoflex dielectric layers , 2019, Materials Research Express.

[21]  Hongwei Zhu,et al.  Recent advances in wearable tactile sensors: Materials, sensing mechanisms, and device performance , 2017 .

[22]  Gregory de Boer,et al.  Robust and high-performance soft inductive tactile sensors based on the Eddy-current effect , 2018 .