Imagine shining a flashlight through a small opening—the light spreads out widely on the other side. In ultrasonic NDT, a smaller transducer diameter acts the same way, causing the sound beam to spread more as it travels through a material. Conversely, a larger transducer diameter focuses the beam, reducing its spread. This relationship is crucial because too much beam spread can blur the detection of flaws. By selecting the right diameter, technicians can control beam spread for more accurate inspections.

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