ASNT Phased Array Level II Practice Test

In Phased Array Ultrasonic Testing (PAUT), using a higher frequency has the effect of improving resolution and sensitivity to small defects. Higher frequencies provide shorter wavelengths, which allow for more detailed scanning and better detection of smaller flaws or discontinuities in the material. This increased resolution is essential when inspecting components where smaller defects can significantly impact safety and functionality.

While higher frequencies can offer better resolution, it's important to note that they are generally less effective in penetrating thick materials. This is because higher-frequency sound waves are more attenuated as they pass through the material, limiting their ability to reach deeper flaws. Therefore, while sensitivity to small defects increases with higher frequencies, penetration may decrease, and the effectiveness of the inspection can be limited based on material thickness.