A CCERT-Based Tactile Sensor With Bidirectional Buffer

At present, the tactile sensor has problems of durability, massive wiring, and low resolution, which greatly limit their application. This article presents a tactile sensor system based on capacitively coupled electrical resistance tomography (CCERT). The capacitive coupling technology is applied to carry out noncontacting measurement of the pressure sensitive element and, therefore, the tactile sensor avoids the problem of stress concentration and durability problems caused by massive wiring. A bidirectional buffer is proposed to optimize the output and input impedance of the capacitive coupling system. The proposed buffer can reduce the complexity of the system compared with the traditional scheme. Theoretical analysis and experimental results show that the proposed buffer can meet the requirements, and the sensor system can measure the force position, amplitude and distribution and has the potential to be used in a high-performance tactile system.