Which testing method name is associated with the perpendicular entry of ultrasound to the test surface?

Which testing method name is associated with the perpendicular entry of ultrasound to the test surface?

• A. Angle beam testing
• B. Surface wave testing
• C. None
• D. Straight beam testing

Answer: (D)

Perpendicular entry means the ultrasound beam enters the material at 90 degrees to the surface, which is straight beam testing. In this approach the transducer sits flat on the surface and emits longitudinal waves that travel straight into the material with minimal refraction. Echoes come back along the same path from defects directly beneath the probe or from the back wall, making interpretation simple and reliable for thickness measurements and basic flaw detection. This is different from angle beam testing, which uses a wedge to create an oblique beam, or surface wave testing, where energy travels along the surface rather than penetrating straight down. So the testing method associated with perpendicular entry is straight beam testing.

Perpendicular entry means the ultrasound beam enters the material at 90 degrees to the surface, which is straight beam testing. In this approach the transducer sits flat on the surface and emits longitudinal waves that travel straight into the material with minimal refraction. Echoes come back along the same path from defects directly beneath the probe or from the back wall, making interpretation simple and reliable for thickness measurements and basic flaw detection. This is different from angle beam testing, which uses a wedge to create an oblique beam, or surface wave testing, where energy travels along the surface rather than penetrating straight down. So the testing method associated with perpendicular entry is straight beam testing.