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0 comments 0A highly sensitive sensor in the shape of a thumb
``A soft thumb-sized vision-based sensor with accurate all-round force perception'' developed by the research team of the Max Planck Institute for Intelligent Systems in Germany is the contact location and the direction and magnitude of the applied force. It is a soft thumb-type sensor that accurately estimates by deep learning. Even if it is lightly touched, the camera installed inside detects it with high sensitivity. [Image] Touching the thumb sensor continuously provides a force distribution map The proposed thumb-shaped sensor consists of a soft shell combined around a light and rigid skeleton. The diameter is 40mm and the height is 70mm. The shell, made of elastomer mixed with dark, highly reflective aluminum flakes, has a grayish opaque color that prevents light from entering. Inside the thumb sensor is a camera with a small fisheye lens with a field of view of 160 degrees (the Raspberry Pi camera module has a resolution of 1640 x 1232 and a frame rate of 40 fps), which is illuminated by an LED light to produce colorful images. record. The camera records images many times per second and feeds the data into a deep learning network. The learned model detects slight changes in the color pattern inside the sensor from the data sent. It instantly determines where contact is made, how strong the force is, and where the force is directed, providing a continuous directional force distribution map across the sensing surface. As a result of accuracy experiments, it has a spatial resolution of 0.4 mm, a force magnitude accuracy of about 0.03 to 2 N, and a force direction accuracy of 5 degrees, and can simultaneously measure multiple contacts with different contact areas. did it. Unlike conventional tactile sensors, this thumb sensor has high sensitivity and accuracy, but it is attractive because it can be easily implemented with a single camera and simple manufacturing technology and at a low price of less than $ 100. Therefore, both hardware and software can be easily adapted to various robots. Source and Image Credits: Sun, H., Kuchenbecker, K.J. & Martius, G. A soft thumb-sized vision-based sensor with accurate all-round force perception. Nat Mach Intell 4, 135-145 (2022). https: //doi.org/10.1038/s42256-021-00439-3 * Written by Yuki Yamashita, who presides over the web media "Seamless" that introduces the latest research in technology. Mr. Yamashita picks up highly novel scientific papers and explains them.
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