Phased Array (PA) ultrasonic is an advanced method of ultrasonic testing that has applications in industrial nondestructive testing. When applied to metals the PA image shows a slice view that may reveal defects hidden inside a structure or weld.

The PA consists of many small ultrasonic elements. The beam is swept like a search-light through the tissue or object being examined, and the data from multiple beams are put together to make a visual image showing a slice through the object. Multiplexing allows fast displacement of ultrasonic beam within probe.

Main benefits of ultrasonic phased arrays

High-speed inspection using single-axis scans instead of conventional raster scan
Near-optimal focal length and focal spot for various areas of complex parts or thick components
Small, simple probe assembly with multiple beams from a single probe
Easy-to-install, low-cost, one-axis scanning systems
Better detection in austenitic materials and dissimilar metal (DM) welds
Reduced time exposure to radiations
Ability to test welds with multiple angles from a single probe
Flexible and reduction in the time of performing inspection.