Name one factor that can change the sensitivity of a PAUT inspection.

The sensitivity of a Phased Array Ultrasonic Testing (PAUT) inspection can be significantly affected by changes in the angle of incidence of the ultrasound beam. When the angle at which the ultrasound beam enters the material changes, it alters the interaction of the sound waves with the material's internal structures, such as flaws or boundaries. This adjustment can enhance or diminish the detection of reflectors, thereby influencing the inspection's sensitivity.

For instance, varying the angle may optimize the beam's ability to strike a defect perpendicularly or at a favorable angle where a greater portion of the sound waves reflect back to the transducer. This means that adjusting the angle of incidence can result in improved signal-to-noise ratios, making it easier to identify and characterize imperfections. Thus, the ability to manipulate the angle of incidence is a crucial aspect of maximizing sensitivity in ultrasonic inspections.