Dual Mode Tactile and Proximity Sensor

Dual mode capacitance sensor

A new tactile sensor system measures not only contact force (tactile information) but also the approach of an object before it touches the sensor (proximity information). The sensor consists of two layers of an electrode array crossed to make a capacitor cell. Dielectric materials sandwiched between the two electrode layers form a capacitor array at the crossing points. The dielectric material between the electrodes deforms due to contact force, inducing a capacitance change between the upper and lower electrodes. Scanning this capacitance change captures contact force distribution, and by using the fringe capacitance in the upper electrodes, the sensor can sense the approach of an object (proximity) before it touches the sensor.

Both tactile and proximity sensing in a single platform

Existing sensors can either operate as a tactile sensor by detecting the contact pressure or as a proximity sensor to detect an approaching object. Tactile and proximity sensors are needed in systems such as robots. When two individual sensors are used on a robot, a large area and volume is required. This technology is the first ever to implement a tactile sensor with proximity sensing capability in a single platform.

Phase of Development

• Proof of concept. Prototype built and tested.

Benefits

• Eliminates the need for two separate sensors
• Simpler to implement. Less space and volume required

Features

• Tactile sensor with proximity sensing capability
• Single platform
• Capacitance sensor

Applications

• Artificial tactile skin for robots
• Robots
• Machine interface
• Interface for mobile devices
• Tactile sensor
• Proximity sensor