[HN Gopher] Scientists found a way to make sound travel in only ...
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       Scientists found a way to make sound travel in only one direction
        
       Author : Brajeshwar
       Score  : 56 points
       Date   : 2024-10-13 15:32 UTC (6 hours ago)
        
 (HTM) web link (www.zmescience.com)
 (TXT) w3m dump (www.zmescience.com)
        
       | pizzafeelsright wrote:
       | Audible laser?
       | 
       | Line of sight audio would be wonderful in a crowd.
        
       | DougN7 wrote:
       | I read the article and still don't get it. Anyone want ELI5?
        
         | kylebenzle wrote:
         | They used a concave disk-like speaker to produce sound. This
         | solid shape makes the sound waves kind of spin around
         | themselves like a tornado or one of those bubble rings you see
         | people blow underwater [1] instead of a normal pressure wave
         | that goes in all directions.
         | 
         | The tornado sound wave can only move forward and once it hits
         | something is dissipated and doesn't reflect the sound.
         | 
         | 1. https://youtu.be/t2kvEC852MI?si=QJjinL7AK6ZZS_SO
        
         | abetusk wrote:
         | I've only skimmed the article/paper and I also dont'
         | understand, so I'm just as ignorant as you, but there is such a
         | thing as a Tesla valve that is a static object that allows
         | water to flow in one direction [0]. I would assume that maybe
         | they can make little vortices of air/liquid (as the comment by
         | kylebenzle suggests) that are dynamic and create a similar
         | structure as it evolves.
         | 
         | [0] https://en.wikipedia.org/wiki/Tesla_valve
        
       | cherryteastain wrote:
       | We already knew a way - a shockwave
        
       | bckr wrote:
       | This is different mechanism from the sound laser or SASER. The
       | sound laser works like a laser, with a cavity where particles are
       | bounced back and forth to stimulate a highly coherent beam of
       | waves.
       | 
       | I'm not sure if this new mechanism is definitely better than the
       | existing sound laser?
        
       | coding123 wrote:
       | I just want a way to not hear my neighbor's 10 yo bounce a
       | basketball for 3 hours a day
        
       | satya71 wrote:
       | This seems to be similar to a microwave circulator.
       | https://en.wikipedia.org/wiki/Circulator
        
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       (page generated 2024-10-13 22:01 UTC)