A new soft tactile sensor turns pressure and strain into visible color patterns that a standard camera can read without heavy reconstruction software.
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Engineers led by Queen Mary University of London have created a soft that lets robots observe touch as changing color. Instead of producing only a single force reading, the material reveals where contact happens and how pressure spreads across its surface.
The device transforms invisible mechanical forces into dynamic patterns. A standard camera records those patterns and turns them into of contact, strain and pressure in real time.
This design tackles a familiar in vision-based tactile sensing. High-detail systems often depend on complex reconstruction algorithms that add and latency. Faster systems may lose the fine spatial detail needed for careful manipulation.
The new sensor moves much of the sensing process into the material itself. When an object presses the soft surface, microscopic structural changes alter the reflected color. The useful information is already present in the light signal rather than being reconstructed from a .
During testing, the researchers captured small features including finger ridges and details on a coin. The system used a simple low-cost camera, showing that high sensor density does not always require complicated microelectronics.
The approach uses materials, which change optical appearance when mechanically deformed. It brings together research in soft robotics, polymer characterization and functional materials.
A robot gripper fitted with this kind of skin could receive richer feedback about shape, pressure and slipping. Similar technology might also support prosthetics, medical devices or tools that must handle delicate objects.
The work remains a rather than a finished commercial product. Engineers will still need to test durability, calibration and performance under changing light. Even so, turning touch directly into color could make sensitive robotic systems simpler and faster.
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