A Two-Ply Polymer-Based Flexible Tactile Sensor Sheet Using Electric Capacitance

Author： Guo Shijie Shiraoka Takahisa Inada Seisho Mukai Toshiharu

Publisher： MDPI

E-ISSN： 1424-8220|14|2|2225-2238

ISSN： 1424-8220

Source： Sensors, Vol.14, Iss.2, 2014-01, pp. : 2225-2238

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Abstract

Traditional capacitive tactile sensor sheets usually have a three-layered structure, with a dielectric layer sandwiched by two electrode layers. Each electrode layer has a number of parallel ribbon-like electrodes. The electrodes on the two electrode layers are oriented orthogonally and each crossing point of the two perpendicular electrode arrays makes up a capacitive sensor cell on the sheet. It is well known that compatibility between measuring precision and resolution is difficult, since decreasing the width of the electrodes is required to obtain a high resolution, however, this may lead to reduction of the area of the sensor cells, and as a result, lead to a low Signal/Noise (S/N) ratio. To overcome this problem, a new multilayered structure and related calculation procedure are proposed. This new structure stacks two or more sensor sheets with shifts in position. Both a high precision and a high resolution can be obtained by combining the signals of the stacked sensor sheets. Trial production was made and the effect was confirmed.