Can ultrasonic waves be stopped or mitigated?

Summary: After use of Ultrasonic energy we need to mitigate the propagation of mechanical waves, need a solution to stop propagation or at least mitigate it.

Hello Scientists,

After use of Ultrasonic energy we need to mitigate the propagation of mechanical waves, need a solution to stop propagation or at least mitigate it.
Can someone help to know this possibility ?

Note that the frequency is 20Khrz

Thanks,
 

Drakkith

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DaveC426913

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Spoiler: a bit of vacuum could be effective...
 

russ_watters

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Concrete.
 

fresh_42

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I have deleted the discussion on the meta level. It's not the right place here.

Welcome @Zakaryae Laoujihi! You see, the medium plays a crucial role in your question. What do you have in mind?
 

Baluncore

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@Zakaryae Laoujihi, welcome to PF.

There are many ways to reduce the propagation of ultrasonic waves. The best method will depend on the situation. How stable is the frequency or the position of the source of ultrasonic energy?

Mixing materials with different density or speed of sound will have different acoustic impedances that will cause attenuation of the wave. Hanging heavy folded curtains in air is effective. Many alternating layers of different density material can help. You can use materials that are composite such as a closed cell foam.

You can use structure, geometry and wavelength to reflect the energy. For example you can make a layer that is half a wavelength thick that will efficiently reflect the wave.

You can use active noise cancellation. That uses an amplifier to generate a negative wave to cancel the noise source.

So what is the situation? Where does the ultrasonic wave come from?
Is the ultrasonic wave a problem in air, water, a building, or a human body?
 

sophiecentaur

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It would help to know the amount of attenuation that’s required. This is an Engineering Problem an so it needs some figures or, at least a verbal description.
Is energy dissipation needed or will it suffice to reflect the energy?
 

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