New Techniques for Acoustic Nondestructive Testing,
STANFORD UNIV CA EDWARD L GINZTON LAB OF PHYSICS
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The electronics of the previously existing imaging system were rebuilt to allow operation in the pulse-echo as well as through transmission modes and to improve the overall sensitivity. In addition, an improved array developed on a separate contract was incorporated. Improved performance and high scan rates are reported in through transmission. Pulse-echo, B-scan images are reported in aluminum and steel with shear waves, longitudinal waves, Lamb waves, and Rayleigh surface waves. The definition at 2.7 MHz is approximately 2.5 mm in the transverse direction, 3.5 mm in the range direction at a distance of 15 cm from the transducer array.