DMA probes use phased array ultrasound to enable an extended inspection range for improved evaluation of coarse-grained austenitic and Inconel alloy materials and welds. DMA probes combine the benefits of the focused longitudinal wave S-scan and pitch catch longitudinal inspection methods.
Because the TX and RCV elements are acoustically insulated through the wedge, there is no need for wedge dampening material and a large standoff distance. The DMA wedge is, therefore, a smaller wedge that can extend the useful focus depth and range of the probe further into the material, resulting in a higher SNR over a larger sound path.
The DMA inspection method presented here uses two types of standard probes a 2.25 MHz probe and a 4 MHz probe that provide off the shelf inspection capability for a wide range of austenitic materials and weld bevels, including dissimilar metal, corrosion-resistant alloy (CRA) welds.
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