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Tactile sensor targets robotic hand applications

February 9, 2022 By Redding Traiger

Melexis has made a major innovation to improve robots’ ability to interact with fragile or diverse objects. The company has unveiled Tactaxis, a fully integrated tactile sensor that is compact, soft, and provides the 3D force vector acting on its surface. This improves robots’ hands and grippers, making delicate operations such as fruit picking possible. The technology is successfully implemented in a functioning prototype.

The ground-breaking prototype features multiple 3D magnetometer pixels, using Melexis’ industry-proven Triaxis technology. The sensor is accompanied by a magnet which is embedded into an elastomer material. This presents a soft contact interface, emulating the attributes of human skin. The arrangement offers a high sensitivity so that detection of even small amounts of force will generate a response. The achieved force resolution is 2.7 mN which is enough to distinguish the weight change of a fraction of a gram (~ 0.3 gram). The Tactaxis prototype is highly compact (with dimensions of just 5 mm x 5 mm x 5 mm) and therefore suitable for tight spaces.

The gradiometric approach makes the sensor immune to magnetic stray fields. This prevents potential measurement errors. It is also robust enough to cope with harsh conditions (temperature variations, etc.). Unlike competing for optically-based tactile sensors, Tactaxis is completely integrated. It will be possible to produce high volumes of factory-calibrated sensors. This semiconductor process results in major cost and reliability benefits.

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Filed Under: Sensors, weight Tagged With: Melexis

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