Which of the following definitions best represents the pitch of a phased array ultrasonic testing (PAUT) probe?

The pitch of a phased array ultrasonic testing (PAUT) probe refers to the center-to-center distance between two successive elements in the probe. This measurement is crucial because it directly influences the resolution and the ability of the system to detect defects or variations within a material. The spacing between the elements affects the beam profile, focal depth, and sensitivity of the ultrasonic waves being emitted and received.

In a phased array system, having the correct pitch is essential for optimizing the steering and focusing of the ultrasonic beam. A smaller pitch can allow for finer control and a more focused beam, which enhances the detection capabilities.

Other options present aspects related to the overall design of the probe but do not specifically define the pitch. Element height or elevation refers to the vertical dimension of the elements, the width of an individual element describes its lateral dimension, and center frequency pertains to the operational frequency of the ultrasound waves generated, none of which capture the specific concept of pitch as it relates to spacing between elements.