Noise pollution is one of the bugbears of modern life. The sound of machinery, engines, neighbours and the like can seriously affect our quality of life and that of the other creatures that share this planet.
But insulating against sound is a difficult and expensive business. Soundproofing generally works on the principle of transferring sound from the air into another medium which absorbs and attenuates it.
So the notion of creating a barrier that absorbs sound while allowing the free of passage of air seems, at first thought, entirely impossible. But that’s exactly what Sang-Hoon Kima at the Mokpo National Maritime University in South Korea and Seong-Hyun Lee at the Korea Institute of Machinery and Materials, have achieved.
These guys have come up with a way to separate sound from the air in which it travels and then to attenuate it. This has allowed them to build a window that allows air to flow but not sound.