Abstract
A simple method of simultaneously measuring the longitudinal and shear acoustic velocities in isotropic solids has been developed by exploiting the behaviour of ultrasonic waves upon refraction at a water-solid interface and using a semi-cylindrical sample shape. The technique needs only one broad-band transducer, no mode-conversion wedge is required and the immersion coupling ensures excellent reproducibility. Velocity measurements have been made on steel, aluminium and brass samples (with a radius greater than 4 mm) immersed in water and a precision of about 0.6% for the shear velocity and 0.3% for the longitudinal velocity has been attained.
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