Final answer:
Phased array testing is an advanced form of ultrasonic nondestructive testing used in many industries, capable of detecting internal defects and measuring coating thickness with increased speed and detection probability, though not necessarily better for all applications and requiring extra training.
Step-by-step explanation:
Phased array testing is a sophisticated form of ultrasonic nondestructive testing (NDT) used across various industries, including the nuclear power industry, aerospace, and manufacturing. Unlike conventional ultrasonic testing, which uses a single transducer to send and receive sound waves, phased array testing employs multiple transducers that can be individually controlled. This allows for more precise inspections, as one can adjust the angle and focus of the sound waves to thoroughly examine the internal structure of a material for defects such as cracks and voids. Furthermore, phased array testing is valuable for applications like measuring the thickness of coatings, even when multiple layers are involved.
While phased array testing can provide increased speed and a better probability of detection, it is not inherently better for all applications. Its complexity means that adequate training is necessary, especially for Level 2 personnel, contrary to the claim that it does not require additional training. It should be used where it offers clear advantages over conventional methods.