Whisker-Inspired Sensor Gives Tiny Drones the Ability to “Feel” Their Way Through Disasters

Rescue teams are increasingly deploying ultra-compact drones—devices that weigh less than a stick of butter—to search collapsed structures after landslides, earthquakes, or large fires. Because of their tiny size, these drones have limited onboard compute and power, which restricts the range of cameras and lidar. In smoky environments, at night, or when glass obstructs vision, conventional sensors can become ineffective, leaving survivors difficult to locate.

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A research team at Delft University of Technology in the Netherlands has created a lightweight tactile sensor that lets such drones navigate without relying on visual input. The device mimics the whiskers of nocturnal animals such as mice and cats, which detect obstacles through touch. The sensor is engineered to be low-latency and low-power, meeting the strict weight and energy constraints of micro-drones. By continuously measuring contact forces on its whisker-like probes, the drone can map nearby surfaces and avoid collisions even in total darkness.

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• Drone mass: under the weight of a typical butter stick (? 30 g).

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• Sensor requirements (as defined by the team): lightweight, low-latency, low-power.

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If adopted, the tactile system could expand the operational window for drone-assisted search-and-rescue missions. Teams would be able to deploy drones immediately after a disaster, regardless of lighting conditions or smoke density, and probe tight crevices that larger aircraft cannot reach. The ability to “feel” obstacles also reduces the risk of drones becoming trapped or damaged, potentially increasing the amount of real-time situational data delivered to responders.

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• “For tactile sensing to work on drones, it needs to be lightweight, low-latency, and low-power,” — Salwa Hamaza, a professor at Delft University of Technology

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