Term Categories: Glossary

A wave in which the particle motion in the material is parallel to the wave propagation direction. Also called a longitudinal wave.

A measure of the similarity of two oscillating functions

A negatively charged electrode, as of an electrolytic cell, a storage battery, or an electron tube. The electrode at which reduction (and practically no corrosion) occurs. It is the opposite of an anode.

The process whereby the magnitude of the output of a measuring instrument is related to the magnitude of the input force driving the instrument (i.e. Adjusting a weight scale to zero when there is nothing on it).

A data presentation method applied to pulse-echo and transmission techniques. It yields a two-dimensional plan view of the object. No indication of depth is given unless special gating procedures are used

Reflection of an ultrasonic wave from an interface

The edge, end or face of a finite medium

The extraneous signals caused by random signal sources within or exterior to the ultrasonic testing system, including the test material. Sometimes called grass or hash.

The signal received from the far boundary or back surface of a test object

A data presentation method applied to pulse echo techniques. It produces a two-dimensional view of a cross-sectional plane through the test object. The horizontal sweep is proportional to the distance along the test object and the vertical sweep is proportional to depth, showing the front and back surfaces and discontinuities between