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Structural Health Monitoring with Piezoelectric Wafer Active Sensors, 2nd Edition by Victor Giurgiutiu

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Figure 13.47 2-D circular ring array design: (a) schematic of the circular ring array; (b) beamforming at various angles with d=0.5λimage, r/d=10image, M=64image; (c) beamforming with M=2image when the circular ring array is reduced to a classic dipole.

The beamforming ...

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