In ultrasonic testing, transducer B is used to check which parameter?

• A. Wedge angle verification
• B. Resolution
• C. Sensitivity calibration
• D. Distance calibration

Answer: (B)

Resolution is the ability to distinguish two closely spaced reflectors along the beam path. Transducer B is used to check this because its higher frequency and wider bandwidth create a shorter pulse, which improves axial resolution. When you test resolution, you look for two separate echoes from reflectors placed very close together. If transducer B can produce two distinct signals, the system has good resolving power. If not, closely spaced features may blur into a single indication, showing limited resolution.

This differs from wedge angle verification, distance calibration, and sensitivity calibration, which are about the beam direction through the wedge, known thickness/time distance accuracy, and amplitude response, respectively.