Austenitic, Nickel, and Other Coarse Grain Alloy Dual Matrix Array (DMA) probes used in tandem configuration generate transmit-receive longitudinal waves (TRL). This technique is less affected by beam degradation and offers significant signal-to-noise
Phased Array Probes | Olympus IMS
Phased Array Probes and Wedges
Olympus Dual Linear Array Probe Overview - YouTube