by Charles Q. Choi, Live Science Contributor
Mechanical eyes that shoot laser beams could one day help robot bees fly without crashing into obstacles, researchers say.
These laser eyes could also one day help people control smartphones, tablets, laptops, wearable technology and other mobile devices using only gestures, the researchers added.
Currently, researchers are developing biologically inspired, bee-size flying robots dubbed RoboBees. These devices might one day find use in everything from pollinating crops to locating disaster victims.
Previous research found that robot bees are capable of flying while
tethered and moving while submerged in water. However, these machines
lack depth perception. This is a major problem, because it means these
robots would have a tough time avoiding flying into walls or landing on
flowers.
To tackle this challenge, researchers now want to outfit robot bees with a laser-based version of radar. This technologies, known as lidar
— short for light detection and ranging — emits invisible laser pulses
instead of the radio waves used in radar. Sensors measure how long it
takes reflected light to travel, which makes it possible to calculate
the distance, size and shape of objects. And unlike most lasers, these
beams are safe for use around eyes.
"Our technology is very similar to what exists in a Microsoft Kinect
that comes with the Xbox for sensing your movements for a game," Karthik
Dantu, a computer scientist at the University at Buffalo in New York,
told Live Science. "These are extremely safe technologies, similar to ones already used in daily life today."
Lidar is currently helping driverless car prototypes navigate their surroundings. The lidar systems on these vehicles are typically about the size of camping lanterns.
"Essentially, it's the same technology that automakers are using to ensure that driverless cars
don't crash into things," Dantu said in a statement. "Only, we need to
shrink that technology so it works on robot bees that are no bigger than
a penny."
Computer-vision expert Sanjeev Koppal and sensor expert Huikai Xie,
both at the University of Florida, will develop the tiny sensor that
measures reflected light. Meanwhile, Dantu will create novel perception
and navigation algorithms to help RoboBees analyze and map their
environments.
"Lidar is basically exploiting the 'echo' of a light pulse," Koppal
told Live Science. "You can imagine that the echo of a light pulse that
leaves a sensor, bounces off an object and returns is really fast.
Detecting this quickly, but without complex circuitry and inside a small
form factor, is one of the main challenges."
The micro-lidar device will weigh about two-thousandths of an ounce (56
milligrams), Koppal said. The researchers hope to have working
micro-lidar sensors and algorithms in three years, Dantu said.
Scientists at Harvard University will incorporate the technology into
the RoboBees.
The researchers suggested that micro lidar will not be limited to robot insects in the future. Other applications could involve helping people interact with mobile devices using "natural user interfaces" similar to Microsoft's Kinect, which can detect gestures that people make.
"With micro lidar, you can imagine doing natural user interfaces for
wearable technologies like smart clothing and smartwatches," Koppal
said.
