Chinese researchers have developed a biomimetic sensor that allows robots to detect, identify, and characterise objects without any physical contact, drawing directly from the hunting mechanism of the electric eel. The breakthrough, published last month in the peer-reviewed journal Advanced Materials, was led by Professor Zhang Weiqiang of Xidian University and could redefine how machines interact with their environments in manufacturing, space operations, and hazardous inspection tasks.

Nature's radar, reimagined in silicon

Electric eels navigate and hunt in complete darkness by generating electric fields around their bodies and reading distortions caused by nearby objects — a biological sonar of sorts. The Xidian University team replicated this mechanism in hardware, building a sensor that generates its own steady electric field and monitors perturbations within it.

The sensor is fabricated from a specially treated fluoropolymer that behaves like a miniature static battery. Once charged, it retains that charge over extended periods, sustaining a consistent electric field analogous to, as the researchers describe it, an invisible spider's web around the device.

What the sensor can detect

“When an object draws near, the sensor picks up changes in the field and from those changes, it can infer the object’s electrical conductivity, dielectric properties and geometric shape,” Professor Zhang said in a video interview last week. This means a robot equipped with the sensor can distinguish between materials and surface conditions before a single point of physical contact is made.

“We want the machine to sense an approaching target – distinguish its material and surface condition – before any physical contact,” Zhang said. The capacity to pre-classify an object’s composition and geometry non-invasively is a meaningful leap beyond conventional proximity sensors, which typically register only distance.

Why it matters for robotics

Non-contact sensing addresses one of the persistent pain points in robotic manipulation: the risk of damage when a machine misjudges the fragility or surface texture of an object it is about to grasp. Industries ranging from precision electronics assembly to surgical robotics have long sought sensors that can ‘feel’ before they ‘touch’.

The technology also has direct relevance to space robot operations, where physical contact with unknown surfaces carries outsized risk, and to equipment inspection in environments too dangerous for human technicians. The research team specifically cited these application domains in their work.

The competitive backdrop

China has accelerated investment in robotics and advanced sensing as part of its broader industrial policy push, even as US export controls tighten access to certain semiconductor technologies. Biomimetic sensor research — drawing from biology rather than conventional chip architectures — represents a pathway that sidesteps some of those supply-chain constraints.

Several global robotics players, including firms in Japan, South Korea, and the United States, are pursuing comparable non-contact sensing capabilities, making the race to commercialise this class of technology increasingly competitive.

What’s next

The publication in Advanced Materials marks a peer-reviewed validation of the concept, but the path from laboratory demonstrator to production-ready robot component typically involves years of durability testing, miniaturisation, and integration work. Whether Xidian University pursues commercialisation through spin-offs or industry partnerships will be a key development to watch, as will any follow-on funding from China’s national science and technology programmes.