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Robot Bloodhounds Can Now Tracks Different Odors on The Ground

A newly developed robot can rapidly detect odors from sources on the ground, such as footprints and could even read a message written on the ground using odors as a barcode.

Over the past two decades, researchers have tried to develop robots that rival the olfactory system of bloodhounds, which are famous for their ability to track scents over great distances.

However, most robots can only detect airborne odors, or they are painstakingly slow at performing analyses. Researchers from Kyushu University in Japan wanted to develop a robot with a high-speed gas sensor that could rapidly track invisible odor sources on the ground.

Credit: American Chemical Society. 

They based their odor sensor on a technique called localized surface plasmon resonance (LSPR) that measured changes in light absorption by gold nanoparticles upon exposure to a gas. As the robot traveled across a surface, a tube placed close to the ground suctioned odors into the LSPR sensor.

The researchers showed that the sensor could accurately detect the location of ethanol odor sources placed at different positions along the robot's path, at a travel speed of 10 centimeters/second (about 4 inches/second).

In addition, the robot could read the word "odor" in binary barcode deposited on the ground as a series of ethanol marks at different positions.

The robot has great potential in a multi-robot communication system or as a security robot working in an office, researchers said.

The full research can be found in the journal ACS Sensors.
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