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Thread: Ventriloquial Sonic Laser

  1. #1 Ventriloquial Sonic Laser 
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    Ultrasound lasers (sasers?) work because the frequency is high enough to keep sound from spreading out much. I was wondering what would happen if two sasers were pointed at the same spot on a rough but non-absorbing surface? Could the interference patterns of two ultrasonic waves create audible sound from a distance?


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  3. #2  
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    I'm not clear about what you have in mind here. Through what medium would the ultrasound pass in reaching this rough surface? - very high frequency ultrasound won't propagate in air at all.


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  4. #3  
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    Sonar does. What do you mean? Recently I learned about directional speakers. Apparently this is already done. I wonder, though, whether the speakers could be made small enough for a personal ventriloquial device...
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  5. #4  
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    Perhaps we are thinking of different kinds of saser. The one I am thinking of was put together at The University of Nottingham, UK, and generates sound in the terahertz (10E12 hz) range. Ultrasound at those very high frequencies would not propagate in a gas.
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  6. #5  
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    Terahertz is overkill! The two waves just have to too high to hear yet make an audible interference pattern.
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