Can ultrasonic waves be stopped or mitigated?

In summary, Ultrasonic energy can be used to make objects or people quieter, but attenuation of the waves is necessary to prevent them from being heard. attenuation of the waves is necessary to prevent them from being heard.
  • #1
Zakaryae Laoujihi
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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,
 
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  • #2
Zakaryae Laoujihi said:
After use of Ultrasonic energy

What exactly does this mean?

Zakaryae Laoujihi said:
we need to mitigate the propagation of mechanical waves, need a solution to stop propagation or at least mitigate it.

What medium are your waves propagating through?
 
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  • #3
Spoiler: a bit of vacuum could be effective...
 
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  • #4
Concrete.
 
  • #5
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?
 
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  • #6
DaveC426913 said:
Spoiler: a bit of vacuum could be effective...
"No one can hear you scream" ?
 
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  • #7
@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?
 
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  • #8
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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1. Can ultrasonic waves be stopped completely?

No, it is not possible to completely stop ultrasonic waves. Ultrasonic waves are a type of sound wave with a frequency above the human hearing range, and they can travel through most materials including air, water, and solids. However, there are ways to mitigate or reduce their intensity.

2. How can ultrasonic waves be mitigated?

Ultrasonic waves can be mitigated through various methods such as using sound-absorbing materials, creating barriers or shields, and using active noise control techniques. These methods work by either absorbing or reflecting the sound waves, reducing their intensity.

3. Do ultrasonic waves have any harmful effects on humans?

Ultrasonic waves are generally considered safe for humans as they are above the audible range. However, prolonged exposure to high-intensity ultrasonic waves can cause discomfort and may even damage the inner ear. It is important to follow safety guidelines and limit exposure to ultrasonic waves.

4. Can ultrasonic waves be used for medical purposes?

Yes, ultrasonic waves have various medical applications such as imaging, surgery, and therapy. Ultrasound imaging uses high-frequency sound waves to create images of internal body structures, while ultrasound therapy uses focused ultrasonic waves to treat various medical conditions such as inflammation and pain.

5. How do ultrasonic waves differ from other types of waves?

Ultrasonic waves have a higher frequency and shorter wavelength compared to audible sound waves. They also have a higher energy level and can travel through most materials, unlike electromagnetic waves which require a medium to propagate. Additionally, ultrasonic waves are not detected by the human ear and require specialized equipment for detection.

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