Política de Cookies
El titular del presente sitio web, espacio, o aplicación (en adelante, el "Contenido") informa a los usuarios de que puede utilizar dispositivos de almacenamiento y recuperación de datos (de manera genérica, denominados "cookies") cuando un usuario navega por el Contenido.
Conventional UT
Pin It




Ultrasonic waves

Ultrasound can be defined as high frequency mechanical waves (>20Khz). In solids, ultrasound waves have different propagation modes, depending on of the way of vibration of the material particles.

Acoustic Impedance

Z=ρV [Kg/m2s]

Resistance offered to the propagation of an ultrasonic wave by a material. It is obtained by multiplying the density ρ of the material and the velocity V of the ultrasonic wave in the material.

Acoustic pressure

P= Za

Denote the amplitude of alternating stresses on a material by a propagating ultrasonic wave. It is related to the acoustic impedance “Z”  and the amplitude of the particle vibration “a”.

Acoustic intensity


The amount of energy per unit area in unit time.

Types of ultrasonic waves

In longitudinal waves particles vibrates along the direction of travel of the wave. Such waves can propagate in solids, liquids and gasses.

Shear Waves or Transverse waves: the particle movement is at right angle or transverse to the propagation direction. Sound velocity in a material is usually different for shear and longitudinal waves.

Surface waves or Rayleigh waves: are produced in a semi-infinite material. They can propagate in a region no thicker than about one wavelength below the surface material. Particles vibrate following an elliptical orbit.

Lamb waves are generated when a second Boundary surface is introduced, i.e. a plate. They can produce symmetric or antisymmetric vibrations in plates with a thickness of several wavelengths. The particles follow an elliptical orbit.

Wave parameters

λ= c/f = cT

λ – Wavelength [mm]: Distance traveled during the time period.

f  – Frequency [MHz]: Number of cycles per second

c – Velocity [mm/us]: Speed at  which energy is transported between two points in a medium.

T – Period [1/f]: oscillation time.

Velocity of ultrasonic waves


E = Young’s modulus of elasticity   [N/m2].

ρ = material density [Kg/m3].

μ = Poisson’s coefficient = (E-2G)G

G = modulus of rigidity.




Pin It

Industrial Scanners

Aerospace Inspection Solutions

Flaw Detectors

Ultrasonic Flaw Detectors

Phased Array

Guided Wave


Integrated Inspection Systems

Bar Inspection Systems

Tube Inspection Systems

NDT Systems Instrumentation





Advanced NDT applications







Application Notes

Applications Support

PDF Library

Video Gallery

Software Downloads

Training Academy

Obsolete Products

ISO Certifications