What term describes the technique that discriminates between variables in a test part based on phase angle changes?

The technique that discriminates between variables in a test part based on phase angle changes is referred to as phase analysis. This method involves measuring the phase relationship between the waves in the material being tested and identifying variations that indicate different properties or flaws. Phase analysis is crucial in nondestructive testing, particularly in techniques like eddy current testing or ultrasonic testing, where phase changes can signify a range of structural issues or material characteristics.

Understanding the phase relationship helps technicians evaluate the integrity of materials and detect defects by providing a clearer distinction of how different components interact within the testing environment. This analysis focuses on interpreting the variations in phase angle to ascertain more information about the test part than merely amplitude measurements can provide. In contrast, the other terms do not specifically emphasize the context of using phase angle changes for discrimination between variables.