New metamaterial improves the acoustic imaging!
Researchers developed a metamaterial made of paper and aluminum that can manipulate acoustic waves to more than double the resolution of acoustic imaging!
The progress never stops, again a promising discovery for the future with this metamaterial.
For one thing, the metamaterial can be used to improve acoustic imaging. Traditionally, acoustic imaging could not achieve image resolution that was smaller than half of a sound’s wavelength. For example, an acoustic wave of 100 kilohertz (kHz), traveling through air, has a wavelength of 3.4 millimeters (mm) – so it couldn’t achieve image resolution smaller than 1.7 mm.
“But our metamaterial improves on that,” says Chen Shen, a Ph.D. student at NC State and lead author of the paper. “By placing the metamaterial between the imaging device and the object being imaged, we were able to more than double the resolution of the acoustic imaging – from one-half the sound’s wavelength to greater than one-fifth.”
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