Today's Hard|Forum Post
Today's Hard|Forum Post

Saturday September 12, 2015

Physicists Achieve Perfect Acoustic Absorption

Does this mean that we’ll get earplugs that can truly block out all sound? I could really use a pair to block out my annoying neighbors.

In a paper published in the Applied Physics Letters this week, the Hong Kong researchers describe a rather more active absorption system (but not totally active) composed of two resonators, both of which are tuned to the same frequency, which is itself "impedance-matched" to the background medium, e.g. the open air or whatever surrounding the acoustic absorber. The result is sound-killing destructive interference.