Phased Array Ultrasonics (PAUT) is an advanced method of ultrasonic testing that has wide applications in industrial nondestructive testing. Common applications are too noninvasively find flaws in manufactured materials such as welds. In PAUT, the beam from a phased array probe can be moved electronically, without moving the probe, and can be swept through a wide volume of material at high speed. The beam is controllable because a phased array probe is made up of multiple small elements, each of which can be pulsed individually at a computer-calculated timing. The term phased refers to the timing, and the term array refers to the multiple elements. Phased array ultrasonic testing is based on principles of wave physics.
Phased Array probes typically consist of a transducer assembly with 16 to as many as 256 small individual elements that can each be pulsed separately. These may be arranged in a strip (linear array), a circular matrix (circular array), a ring (annular array), or a more complex shape depending on the part being tested.
Phased Array is now being utilized in lieu of radiography on many construction and maintenance projects.