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Scientists Develop Stealth Sheet to Escape Infrared Cameras



Washington, June 24 (IANS) American researchers have developed a stealth sheet that can help objects and people hide from infrared cameras, a media report reported.

The New Stealth Journal Described in Advanced Engineering Magazine This Week According to Xinhua News Agency, the materials reported significant improvements over heat-masking technologies.

Warm objects such as human bodies or tank engines release heat as infrared light. Infrared cameras are the heat-sensitive eyes that allow drones to find their targets, even at night or through dense fog.

Less than a millimeter thick, the leaf absorbs and captures approximately 94 percent of the incident infrared light, meaning that warm objects under the camouflage material are almost completely invisible to infrared detectors, the study said.

To catch Jiang and his team, they turned to a unique material called black silicon cells.

"What we have shown is an ultrathin stealth film, and at the moment people have much heavier metal armor or thermal blankets," said Jiang Hongrui, professor of electrical and computer engineering at the University of Wisconsin-Madison. "It's a matter of weight, cost and usability."

Also, the stealth material can strongly absorb light in the so-called medium and long wavelength infrared range, the kind of light emitted by objects is about the temperature of the human body.

By incorporating electronic heating elements into the stealth film, researchers have also created a high-tech disguise for tricky infrared cameras.

"You can purposely deceive an infrared detector with a false heat signature," Jiang said. "It could hide a tank by presenting something that looks like a simple street barrier."

Black silicon absorbs light because it's made of millions of microscopic needles, the nanowires, all pointing upwards like a densely packed forest, incoming light is reflected back and forth between the vertical towers and bounces around the material instead of escaping.

Scientists strengthened their absorption properties, by refining the method by which they produced their material.

"We have not completely reinvented the whole process, but we have extended the process to much larger nanowires," Jiang said.

They made these Nanowires, using tiny silver particles to help shape a thin layer of solid silicon to etch, resulting in a thicket of big needles. Both the nanowires and the silver particles contribute to the absorption of infrared light.

The black silicon of the researchers also has a flexible base with small air channels. These air channels prevent the stealth film from heating up too quickly as it absorbs infrared light.

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1; IANS

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