High-energy electromagnetic radiation with short wavelengths and high penetration capabilities.

A device or component used in ultrasonic testing that is placed between the transducer and the test object to change the angle of the ultrasonic beam. It is typically made of a material with a specific acoustic impedance to control the beam angle and improve coupling.

In radiographic testing, a wedge is a triangular-shaped object typically made of plastic or metal that is placed on the film or detector to create a variation in exposure and compensate for the X-ray attenuation in different areas of the test object.

The distance between two consecutive points in a wave that are in phase, such as the distance between two peaks or two troughs of a wave. In non-destructive testing, wavelength is often used to determine the resolution and diffraction characteristics of waves.

The vertical distance or depth of water or liquid couplant used in immersion testing, typically measured from the transducer face to the surface of the liquid column, influencing the wave propagation and acoustic coupling during ultrasonic inspections.

A concept used in PAUT where the phased array system virtually simulates a single-element transducer at a specific location within the array. Instead of physically moving a single transducer to different positions, the virtual probe allows for the electronic manipulation of the ultrasonic beam characteristics.

A medium or substance, often a gel, oil, or water-based solution, used to facilitate the transmission of ultrasonic waves between a transducer and the surface or interface of a test object, ensuring efficient energy transfer and wave propagation.

A type of wave motion where the displacement of particles or energy is perpendicular or transverse to the direction of wave propagation.

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