Communications of the ACM
Cockroach Cyborgs Use Microphones to Detect, Trace Sounds
Researchers plan to use insect-mounted acoustic sensors to locate survivors in a disaster environment.
Credit: Eric Whitmire
North Carolina State University researchers have developed technology that allows cyborg cockroaches, or biobots, to pick up sounds with small microphones and seek out the source of the sound. The technology is designed to help emergency personnel find and rescue survivors in the aftermath of a disaster.
The researchers have also developed technology that can be used as an "invisible fence" to keep the biobots in the disaster area.
"In a collapsed building, sound is the best way to find survivors," says Alper Bozkurt, an assistant professor of electrical and computer engineering at NC State and senior author of two papers on the work: "Acoustic Sensors for Biobotic Search and Rescue," by Bozkurt, Eric Whitmire, and Tahmid Latif, was presented Nov. 5 at IEEE Sensors 2014 in Valencia, Spain; "Towards Fenceless Boundaries for Solar Powered Insect Biobots," by Bozkurt, Tahmid Latif, Eric Whitmire, and Tristan Novak, was presented Aug. 28 at the 36th Annual International IEEE EMBS Conference, in Chicago.
The researchers' biobots are equipped with electronic backpacks that control the cockroach's movements. Bozkurt's research team has created two types of customized backpacks that include microphones. One type of biobot has a single microphone that can capture relatively high-resolution sound from any direction to be wirelessly transmitted to first responders.
The second type of biobot is equipped with an array of three directional microphones to detect the direction of the sound. The research team has also developed algorithms that analyze the sound from the microphone array to localize the source of the sound and steer the biobot in that direction. The system worked well during laboratory testing. Video of a laboratory test of the microphone array system accompanies this article.
"The goal is to use the biobots with high-resolution microphones to differentiate between sounds that matter — like people calling for help — from sounds that don't matter — like a leaking pipe," Bozkurt says. "Once we've identified sounds that matter, we can use the biobots equipped with microphone arrays to zero in on where those sounds are coming from."
A research team led by Edgar Lobaton has previously shown that biobots can be used to map a disaster area. Funded by U.S. National Science Foundation's CyberPhysical Systems Program, the long-term goal is for Bozkurt and Lobaton to merge their research efforts to both map disaster areas and pinpoint survivors. The researchers are already working with collaborator Mihail Sichitiu to develop the next generation of biobot networking and localization technology.
Bozkurt's team also recently demonstrated technology that creates an invisible fence for keeping biobots in a defined area. This is significant because it can be used to keep biobots at a disaster site, and to keep the biobots within range of each other so that they can be used as a reliable mobile wireless network. This technology could also be used to steer biobots to light sources, so that the miniaturized solar panels on biobot backpacks can be recharged.
The research was supported by the National Science Foundation.
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