Abstract
A technique is presented for measuring surface motions ranging in amplitude from 1 to 60 A, with the aid of a phase-stabilized linear Michelson interferometer. Finite trains of sinusoidal stress waves with amplitudes in this range and frequencies between 0.5 kHz and 0.5 MHz are generated by means of a piezoelectric transducer attached to one end of a bar. It is shown how the displacement recordings may be used to visualize the wave, measure its phase velocity and discriminate between flexural and axial wave motions. The dispersion curves obtained for both flexural and axial waves in a Plexiglas bar and in a beam-like bone sample from a human femur agree with theoretical predictions based on classical beam theory.
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