Which measurement verifies the wedge angle in an ultrasonic transducer setup?

• A. Verification of wedge angle
• B. Sensitivity calibration
• C. Distance calibration
• D. Resolution

Answer: (A)

Wedge angle verification focuses on making sure the beam is entering the material at the exact intended angle. The wedge angle directly determines the beam’s path through the test piece via refraction, so having the correct angle is essential for accurate depth measurements and flaw location. If the wedge angle isn’t verified, the observed reflections won’t correspond to the true geometry of the part, leading to errors in interpretation. This measurement is dedicated to confirming the wedge angle itself, separate from how strong echoes are (sensitivity), how depth is scaled (distance calibration), or how finely features can be distinguished (resolution). In practice, you verify it by measuring the wedge with a precise angle gauge or using a reference block designed to reveal the actual angle, ensuring it matches the intended specification.