Which technique uses high frequency sound vibrations to detect flaws in materials?

Ultrasonic Testing is the technique that employs high-frequency sound vibrations to detect flaws in materials. This method involves sending ultrasonic waves into a material and analyzing the echoes that return from the internal structures. When these sound waves encounter a boundary or flaw, such as a crack or void, they reflect back, allowing technicians to gauge the integrity of the material.

This approach provides high-resolution data about the internal structure of materials, making it highly effective for detecting minute flaws that might not be visible using other testing methods. It is widely used in various industries, including aerospace, manufacturing, and construction, due to its ability to be precise and non-destructive.

In the context of the other options, Magnetic Testing relies on magnetic fields to find surface and near-surface defects, Visual Inspection involves direct observation of surfaces for defects, and Infrared Thermography uses thermal imaging to detect irregularities based on temperature differences. These methods serve specific purposes but do not utilize high-frequency sound vibrations like Ultrasonic Testing does.