Re: Focused sound

From: Dmitri Vikawtsky (Eddow_at_gmx.net)
Date: 08/27/04 

Date: Fri, 27 Aug 2004 21:34:13 +0200

Mok-Kong Shen wrote:

>
>
> Dmitri Vikawtsky wrote:
>
>
>> Sound is nothing more than a wave, while you can "reflect" it with
>> some material, you can make orientation-shaped 'sound-mirors', like
>> mirors used in your torch, where a parabola mirror direct light beam.
>>
>> These mirrors intended to give a unique orientation are just given a
>> parabola shape.
>
>
> Do you happen to have an explanation why the firm concerned
> does it in another, apparently much more complicated, way?
> Thanks.
>
> M. K. Shen
>
Indeed, I forget a detail about sound :) That wave is a particles wave,
while light is an electro-magnetic one. The point here is that 'perfect'
mirrors for sound are kinda impossible at a pocket-torch size. Sound are
for now well-reflected by walls of about 1 or 3m width. In other words,
all is, even a bit, 'transluent' to sound. So, if you try to make a
light-director with transluent paper, you'll have to put several papers
in a complex way in order to achieve the best directing.

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