Distance Gain Size (DGS) diagrams in ultrasonic testing are graphical representations used to determine the size of indications detected during inspections. These diagrams help in evaluating the flaw size based on the amplitude of the ultrasonic signal received.

A material used in ultrasonic testing to introduce a controlled time delay between the initial pulse and the front surface reflection.

An imperfection or discontinuity in a material or component that may affect its performance, quality, or structural integrity.

The region in ultrasonic testing where flaws or indications close to the transducer are not detectable due to the initial pulse and ringing of the transducer.

The process of reducing or dissipating the energy or oscillations of a system.

A visual representation of ultrasonic results displayed as a two-dimensional image, typically used for mapping and analyzing large surface areas. The C-scan image primarily shows the spatial distribution of indications, while the depth information requires additional analysis to be determined accurately.

A fracture or separation in a material, often characterized by its length, width, depth, and orientation.

A substance or material used to provide acoustic coupling between the transducer and the test object to enhance the transmission of ultrasonic waves.

The phenomenon where the sound beam in ultrasonic testing exhibits changes in characteristics when interacting with corners or sharp edges of a material.

Materials that easily allow the flow of electric current due to the presence of free electrons.