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ROBO SPACE
Sandia Labs' Gemini-Scout robot likely to reach trapped miners ahead of rescuers
by Staff Writers
Albuquerque NM (SPX) Aug 19, 2011


Sandia's Gemini-Scout Mine Rescue Robot is equipped to handle any number of obstacles, including rubble piles and flooded rooms, to help rescuers reach trapped miners safely and efficiently. (Photo by Randy Montoya)

In the first moments after a mining accident, first responders work against the clock to assess the situation and save the miners. But countless dangers lurk: poisonous gases, flooded tunnels, explosive vapors and unstable walls and roofs. Such potentially deadly conditions and unknown obstacles can slow rescue efforts to a frustrating pace.

To speed rescue efforts, engineers at Sandia National Laboratories have developed a robot that would eliminate some of the unknowns of mine rescue operations and arm first responders with the most valuable tool: information.

Sandia robotics engineers have designed the Gemini-Scout Mine Rescue Robot, which finds dangers and can provide relief to trapped miners. It's able to navigate through 18 inches of water, crawl over boulders and rubble piles, and move in ahead of rescuers to evaluate precarious environments and help plan operations.

"We have designed this robot to go in ahead of its handlers, to assess the situation and potential hazards and allow operations to move more quickly," said Jon Salton, Sandia engineer and project manager. "The robot is guided by remote control and is equipped with gas sensors, a thermal camera to locate survivors and another pan-and-tilt camera mounted several feet up to see the obstacles we're facing."

Less than four feet long and two feet tall, Gemini-Scout is nimble enough to navigate around tight corners and over safety hatches a foot high. In addition to giving rescuers an idea of what they're headed into, the robotic scout can haul food, air packs and medicine to those trapped underground. It is equipped with two-way radios and can be configured to drag survivors to safety.

Designers built the Gemini-Scout to negotiate nearly every known mine hazard. Methane and other gases can ignite if exposed to sparks, so the electronics are housed in casings designed to withstand an explosion. "Such measures would prevent a spark from causing further destruction. While it might harm the robot, it wouldn't create another dangerous situation for the miners or rescuers," Salton said.

To ensure functionality in flooded tunnels, Gemini-Scout's controls and equipment needed to be waterproof. "When we were designing a robot that could provide this level of assistance, we had to be aware of the pressures and gases that are often found in that environment," said Sandia engineer Clint Hobart, who was responsible for the mechanical design and system integration. "So we had to make sure the strength of materials matched what our goals were, and we had to keep everything lightweight enough so it could navigate easily."

In addition, engineers had to build something intuitive for new operators who need to learn the system quickly. To overcome that challenge, they used an Xbox 360 game controller to direct Gemini-Scout. "We focused a lot on usability and copied a lot of gamer interfaces so that users can pick it up pretty quickly," said Sandia engineer Justin Garretson, the lead software developer.

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