Fingertip sensor: Give the robot a pair of "hands"

Robots also need love. Because of this, the Massachusetts Institute of Technology (MIT) has equipped the robot Baxter with a touch sensor that allows it to “perceive” the gentle caress, gentle hands, and the feeling that he is loved and loved. Of course, this scene has not yet become a reality. However, thanks to the increased force pad on the finger, Baxter can do some repetitive work in a gentle and dexterous way.

Baxter is a robot that can replace people working on production lines. The new sensor, called "GelSight," adds "unprecedented" sensitivity to robotic fixtures . By providing feedback on the compression force, it allows the robot to plug the USB charger into the power supply, even to handle extremely sensitive tasks such as eggs. The GelSight sensor is a square object made of plastic. It has a synthetic rubber layer. Each side is coated with a layer of reflective metal paint, which can reflect the shape of the object back to the sensor, so that it has a precise grasp of the force. The robot can perform extremely dexterous operations.

Edward Adelson, a professor of visual science at the Massachusetts Institute of Technology, said: "Because I have children, I am very interested in the sense of touch. Every time I see them using the visual system, I am very curious, but let I am curious about the way they use their fingers. Since I am an expert in visual research, if you want to look at the signals on your fingers, then the smartest way is to find a way to turn mechanical tactile signals into visual signals – because How is it a picture, I know how to deal with it."

In other words, instead of relying on thousands of miniature force sensors, GelSight “sees” the shape of the object and how close it is to the light sensor. Rubber can also be used as a sticky finger pad.

The coolest thing is that the accuracy of the GelSight sensor is very high. The following is the content of the MIT research report:

“In Platt's experiment, the robot Baxter developed by Rethink Robotics (which was established after the company was stripped from MIT) is equipped with a clamp consisting of two pliers, each with a sensor. With the help of conventional computer vision Algorithm, Baxter can recognize the USB plug and try to hold it. Then, Baxter determines the position of the USB plug relative to the fixture. Although there are 3 mm variations in each dimension of the two dimensions of Baxter holding the USB plug, It can still be plugged into the USB interface with an error of only about 1 mm, which is tolerable."

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