"Physicists Achieve Perfect Acoustic Absorption"

Get creative feedback or just tell us your cat's name. Anything goes here!
Post Reply
User avatar
Site Admin
Posts: 412
Joined: June 6th, 2013, 4:15 pm
Location: Los Angeles, CA
Occupation: Sound Designer

"Physicists Achieve Perfect Acoustic Absorption"

Post by MikeQuell » September 15th, 2015, 5:34 pm

Source: http://motherboard.vice.com/read/physic ... =mbtwitter
Physicists at Hong Kong University of Science and Technology have experimentally demonstrated a system capable of perfect sound absorption. Acoustic waves go in, nothing comes back out. At all.

As often as we may like to imagine quietude, it's not a particularly natural phenomenon. An acoustic insulator may do a pretty good job of soaking up a small range of sounds, but some of that energy is always going to be reflected back, even if at very tiny scales. A material may be a highly complex composite of many different layers of many different viscosities, with each one tuned to absorb some wavelength of sound—what's called a gradient-index material—but imagining that material with all of the layers required to capture all of the different acoustic wavelengths is not very reasonable.

But there are other approaches.

Post Reply