By sensing the subtle changes in the finger’s own magnetic field, this new technology could one day make for ultra-sensitive prosthetic hands.
By MATT SIMON
IMAGINE, IF YOU will, the home robot of the future. It picks clutter off the floor, sweeps, and does the dishes. And it has to do so perfectly: If the robot has an error rate of just 1 percent, it will drop one dish out of a hundred. Totally unacceptable. In no time, your floor would be covered in shards and the robot would get stuck in a sad, vicious feedback loop, dropping dishes and sweeping them up and dropping more dishes, ad infinitum.
To avoid this domestic nightmare, engineers will have to give robots a keen sense of touch. And for that, the machines will need fingertips, perhaps like the one recently described in the journal Science Robotics. It feels in a decidedly nonhuman way, by sensing the subtle changes in the finger’s own magnetic field, and it could one day make for ultra-sensitive prosthetic hands and robots that don’t maim tableware (or people) because they can’t control their grasp.
You, a human, can feel pressures and textures with your fingertips, thanks to specialized sensory cells in the skin called mechanoreceptors. These, along with the nervous system at large, translate mechanical information from the environment into signals your brain can comprehend as the perception of “touch.” Combined with thermoreceptors (which sense temperature) and nociceptors (which sense pain), you’re able to manipulate the world around you without hurting yourself.
Continue reading… “This Fingertip for Robots Uses Magnets to ‘Feel’ Things”
