Tactile Sensing: Giving Robot Hands a Sense of Touch

Vision alone can't tell a robot how firmly it's holding an egg.

Tactile sensors measure contact directly at the fingertip or palm — pressure, shear force, sometimes vibration — information that's very hard to infer from vision alone, especially once an object is occluded by the hand actually holding it.

Common approaches

Capacitive and piezoresistive sensor arrays measure pressure distribution across a fingertip pad. Optical tactile sensors (a notable example being camera-based designs that watch a soft gel deform on contact) can extract very fine-grained shape and force information at the cost of more processing.

Where the field actually stands

High-resolution tactile sensing has improved substantially in research settings, but durable, low-cost, high-resolution tactile skin covering an entire hand — let alone a whole robot — is still more of a research goal than a shipping commercial reality. Most deployed robots today use tactile sensing sparingly, on fingertips rather than full coverage.