A D V A N C E D M A T E R I A L S & P R O C E S S E S | S E P T E M B E R 2 0 2 2 2 9 machined SDHs are the same size, in Fig. 5a it is clear that the indications’ (a) (b) (b) Fig. 3 — (a) TFM (amplitude-based) image of porosity in a stainlesssteel weld; and (b) PCI technique detecting additional porosities at the same location. Fig. 4 — (a) The indication on the left has a high amplitude but the sound wave’s amplitude decreases as the time or distance in the part increases; and (b) the indications on the left, center, and right have same signal intensities. Fig. 5 — (a) Conventional TFM used on side-drilled holes shows that time and distance diminish the signal amplitude; and (b) phase coherence imaging of the same sample show that the signal force remains relatively constant. (a) (b) thicker parts, and for early detection of small critical defects. While amplitude-based techniques still have their place, in many cases, PCI will out-perform conventional methods because it is an amplitude-free technique. It is an exciting field of development that shows significant potential as a solution for many use cases that are a challenge with current technology. ~AM&P For more information: Emilie Peloquin, director global advanced product, Evident Scientific, 110 Magellan Circle, Webster, TX 77598, emilie.peloquin@ evidentscientific.com, 281.832.9361, www.evidentscientific.com. (a) amplitude intensities (the amount of red) decrease as the sound goes deeper in the part. However, in Fig. 5b the intensity levels of all the holes are similar as evidenced by viewing the phase changes for the signals. CONCLUSION This novel phase coherence imaging (PCI) approach offers promising new inspection possibilities for attenuative, noisy, or
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