Grain Noise Reduction by Phase Coherence Imaging

Weak flaws detection and sizing is especially difficult in solids presenting structural noise. A new approach is presented, where a phase coherence operator modifies the beamforming process to achieve a significant reduction of scattering noise. At every range, the output is a function of the aperture data phase diversity. After application of the focusing delays, the grain noise high phase diversity leads to its suppression. The higher phase coherence of flaws allows keeping their indications.