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In this paper, we present a rapid technique to reduce the speckle noise in ultrasonic non-destructive evaluation (NDE) and enhance the image quality using matched filters. This method implicitly explores the signatures and profiles of echoes from legitimate defects and echoes from random reflectors, uses the temporal and spectral distinction to design the filter, and utilizes a particle swarm optimization...
In this paper, we present a novel and flexible method for reliable and robust defect detection in difficult materials. It is well known in the literature that the interaction between ultrasonic beams and the insonified medium is a highly nonlinear process, which potentially exhibits distinctive frequency-dependent properties for defects and random reflectors with a degree of randomness. Instead of...
In non-destructive evaluation (NDE) applications, most materials like concrete, stainless steel and carbon-reinforced composites used extensively in industries and civil engineering exhibit heterogeneous internal structure. When inspected using ultrasound with the conventional delay-and-sum imaging, the signals from defects are significantly corrupted by the echoes form randomly distributed scatterers,...
If the elements in an ultrasound array are damaged, the beamforming performance and imaging quality (contrast and resolution) will be significantly reduced due to the distorted beam pattern with for example, a significant increase of sidelobe level. Defective elements can be detected through either in-direct impedance measurement or direct monitoring of the acoustic output using fibre Bragg grating...
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