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acoustics lens

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epilot

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Does anyone know what an acoustics lens is really?
How can we make one
 
Acoustic lens will focus sound waves like an optical lens focuses light.

A balloon can be used as an acoustic lens. A standard party balloon will work with higher audible frequency sound waves. A larger (1m diameter) spherical shaped balloon makes a vey effective lens for concentrating sound waves. The principle is that the gas in the balloon has a greater acoustic refraction than the surrounding air because the air in the balloon is compressed. Try filling the balloon with different gases EG CO2, natural gas, etc.

A solid satelite dish can also be used - replace the LNB with a microphone.
 
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