Most commercial ultrasonic testing is accomplished using frequencies between?

The correct answer is that most commercial ultrasonic testing is accomplished using frequencies between 1-15 megahertz. This frequency range is widely utilized in the industry because it effectively balances the depth of penetration and resolution necessary for accurate inspection of materials.

In the realm of ultrasonic testing, lower frequencies (such as those under 1 megahertz) tend to penetrate deeper into materials but sacrifice detail, which is critical for detecting smaller flaws or defects. Conversely, higher frequencies, such as those above 15 megahertz, can provide greater resolution and detail but are limited in their penetration depth, making them less suitable for inspecting thicker materials.

The choice of frequency also depends on the type of material being tested and the intended application. For instance, testing thicker welds or components typically employs lower frequencies to ensure sufficient penetration, while higher frequencies might be reserved for thinner sections or applications requiring a fine level of detail.

Thus, the 1-15 megahertz frequency range is optimal for a variety of commercial ultrasonic testing applications, allowing technicians to achieve a good compromise between sensitivity and penetration depth.