VOA常速英语:Researchers Create Artificial Skin With Sense of Touch

Scientists have recently made considerable gains in creating human-like artificial limbs, but they still look and feel artificial. That could change with a development from South Korea. Researchers say they have come up with a synthetic skin that not only feels warm but also has the sense of touch and moisture.

Artificial robotic hands are getting increasingly better at emulating human hands and the most advanced can even be controlled by thoughts.

But people who wear bionic hands must rely on their sight to know what they are touching or grasping.

Now, though, researchers in South Korea and the U.S. say they have created a stretchable artificial skin that can register heat, pressure and moisture.

This polymer-based elastic material is not designed to replace damaged human skin, such as in burn victims, but rather to provide high-resolution sensory capabilities for prosthetic limbs or for the limbs of humanoid robots.

Team leader Kim Dae-Hyeong, a professor at the Seoul National University School of Chemical and Biological Engineering, says its sensors are an exact copy of human skin.

“The skin can feel pressure, temperature, strain, humidity," said Kim. "Also it is soft, just like human skin, and embedded with heating elements that can make itself warm.”

Kim says the artificial skin is made of a combination of rubber, polyamide and silicon with sensor density of up to 400 per square millimeter.

An artificial hand wrapped in the new skin could distinguish between dry and moist objects and measure the pressure of the grasp.

But Kim says what it still can not do is send those signals to a human brain. That, he says, is the scientists’ ultimate goal.

“I hope a robotic limb with this synthetic skin can be used by disabled people. For industrial uses, it can be applied to various types of robots, like a humanoid robot," said Kim.

Scientists say with this sensitive skin, robots may someday be able to type on keyboards and even change a baby’s wet diaper.