# A question about ultrasonic wave

• fannyfanfanz
In summary, if the shear wave is linearly polarized and enters an anisotropic material at normal incidence, it will split into two shear waves with different speeds. Changing the polarization of the incoming shear wave will not affect the speed of the fast shear wave.
fannyfanfanz
Hi,

When a linearly polarized shear wave enters an anisotropic material, shear wave splitting (a fast and a slow shear waves) will occur.
My question is, under normal incident, will the fast shear wave speed vary if the polarization of the incoming shear wave changes?

Thanks!

fannyfanfanz said:
Hi,

When a linearly polarized shear wave enters an anisotropic material, shear wave splitting (a fast and a slow shear waves) will occur.
My question is, under normal incident, will the fast shear wave speed vary if the polarization of the incoming shear wave changes?

Thanks!
Not sure how you can have wave splitting at normal incidence, so rotating polarization will not have any effect.

tech99 said:
Not sure how you can have wave splitting at normal incidence, so rotating polarization will not have any effect.
If the propagation direction of the shear wave is not parallel to the c-axis (assuming the material is transversely isotropic), the shear wave will split at normal incidence.

## 1. What is an ultrasonic wave?

An ultrasonic wave is a type of sound wave that has a frequency higher than the upper limit of human hearing, which is typically considered to be around 20,000 hertz. These waves are typically produced by specialized equipment and can be used for various purposes such as medical imaging, cleaning, and communication.

## 2. How are ultrasonic waves produced?

Ultrasonic waves are produced by using a transducer, which converts electrical energy into mechanical energy. This mechanical energy creates vibrations in a material, such as a piezoelectric crystal, which then generates the ultrasonic waves.

## 3. What are the applications of ultrasonic waves?

Ultrasonic waves have a wide range of applications in various industries. Some common uses include medical imaging, non-destructive testing, cleaning and sterilization, distance measurement, and communication.

## 4. How do ultrasonic waves differ from other types of waves?

Ultrasonic waves differ from other types of waves, such as audible sound waves, in their frequency and wavelength. They have a higher frequency and shorter wavelength, which allows them to travel through materials and produce unique effects such as cavitation.

## 5. Are ultrasonic waves safe for humans?

In general, ultrasonic waves are considered safe for humans at the levels used in various applications. However, prolonged exposure to high intensity ultrasonic waves can potentially cause damage to tissues and hearing. It is important to follow safety guidelines and use proper protective equipment when working with ultrasonic waves.

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