Dual Linear Array 

DLADual Linear Array is an ultrasonic phased array configuration that has two adjacent linear transducer arrays. The DLA has all the benefits of phased array probes: focusing and beam-forming.

As with conventional twin-crystal ultrasonic probes, when the DLA operates in pitch-catch mode, the interface echo is removed and the near-surface resolution increased. This makes it suitable for corrosion mapping. A DLA mounted on a wedge with a roof angle combines the benefits of transmit-receive longitudinal (TRL) probes with the benefits of phased arrays, making it suitable for the inspection of austenitic welds.

For more information on DLA see:

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