Definition
Tactile sensors provide high-resolution contact information at robot fingertips or palms. Vision-based tactile sensors (GelSight, DIGIT, Tactile.AI) use embedded cameras and deformable gel surfaces to produce rich contact images. Resistive and capacitive arrays (PaXini, BioTac) measure pressure distributions directly. Tactile sensing enables slip detection, object material recognition, in-hand manipulation feedback, and contact-rich assembly. Integrating tactile observations into learned policies is an active research area — sensor data can be concatenated with visual features or processed through specialized tactile encoders.
Why It Matters for Robot Teams
Understanding tactile sensing is essential for teams building real-world robot systems. Whether you are collecting demonstration data, training policies in simulation, or deploying in production, this concept directly affects your workflow and system design.