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Cornell scientists develop new material to give robots more sensitive touch

September 12, 2019 by David Edwards

A new synthetic material created by a scientist at Cornell University is said to give robots a “softer touch”.

Developed by PhD student Patricia Xu, at Cornell’s Organic Robotics Lab, the “sensory network” – also dubbed “optical lace” – is said to be similar to the human biological nervous system.

The lab’s paper, Optical Lace for Synthetic Afferent Neural Networks, was published in Science Robotics.

Lab director Rob Shepherd, associate professor of mechanical and aerospace engineering, the paper’s senior author, says: “We want to have a way to measure stresses and strains for highly deformable objects, and we want to do it using the hardware itself, not vision.

“A good way to think about it is from a biological perspective. A person can still feel their environment with their eyes closed, because they have sensors in their fingers that deform when their finger deforms. Robots can’t do that right now.”

Shepherd’s lab previously created sensory foams that used optical fibers to detect such deformations.

For the optical lace project, Xu used a flexible, porous lattice structure manufactured from 3D-printed polyurethane.

Xu threaded its core with stretchable optical fibers containing more than a dozen mechanosensors. She then attached an LED light to illuminate the fiber.

When she pressed the lattice structure at various points, the sensors were able to pinpoint changes in the photon flow.

Xu says: “When the structure deforms, you have contact between the input line and the output lines, and the light jumps into these output loops in the structure, so you can tell where the contact is happening.

“The intensity of this determines the intensity of the deformation itself.”

The optical lace would not be used as a skin coating for robots, Shepherd said, but would be more like the flesh itself.

Robots fitted with the material would be a far cry from the cold, uncaring cyborgs of dystopian science fiction.

They would be better suited for the health care industry, specifically beginning-of-life and end-of-life care, and manufacturing, he said.

Shepherd says: “There’s a lot of people getting older, and there’s not as many young people to take care of them. So the idea that robots could help take care of the elderly is very real.

“The robot would need to know its own shape in order to touch and hold and assist elderly people without damaging them.

“The same is true if you’re using a robot to assist in manufacturing. If they can feel what they’re touching, then that will improve their accuracy.”

While the optical lace does not have as much sensitivity as, say, a human fingertip that is jam-packed with nerve receptors, the material is more sensitive to touch than the human back.

The material is washable, too, which leads to another application: Shepherd’s lab has launched a startup company to commercialize Xu’s sensors to make garments that can measure a person’s shape and movements for augmented reality training.

The researchers also plan to explore the potentials of incorporating machine learning to detect more complex deformations, like bending and twisting.

Xu says: “I make models to calculate where the structure is being touched, and how much is being touched.

“But in the future, when you have 30 times more sensors and they’re spread randomly throughout, that will be a lot harder to do. Machine learning will do it much faster.”

Even as robots become more aware of how they interact with the environment, humans still have a distinct advantage.

Shepherd says: “We don’t know our own bodies as well as some robots know parts of their limbs and joints and fingers.

“But we can still perform better than robots generally because we can deal with uncertainty through mechanical design, as well as neural architecture.”

The paper was co-authored by postdoctoral researcher Anand Kumar Mishra, PhD students Lillia Bai and Cameron Aubin, and Letizia Zullo from the Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia.

The research was supported by grants from the Air Force Office of Scientific Research and the National Institutes of Health.

Original story by David Nutt on Cornell University website

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Filed Under: News, Science Tagged With: care, contact, cornell, deforms, detect, environment, feel, fibers, fingers, human, intensity, lab, lace, lattice, learning, light, machine, material, measure, optical, output, paper, people, robots, sensors, shepherd, structure, touch, touched, xu

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