the Elastic Parameters

Ultrasound-stimulated vibro-acoustic spectrography is a recently-developed method that employs the radiation force of two intersecting continuous ultrasound beams to remotely vibrate an object at an arbitrary low frequency. Object vibration produces a sound field (acoustic emission) in the medium, which is a function of object mechanical properties. By measuring the acoustic emission field, one can obtain information about the mechanical parameters ofthe object. In this paper, we use this method for remote (noncontact) measurement of the dynamic Young’s modulus of a rod based on its fundamental resonance frequency. Experimental results on an aluminum rod agree with the published data. KEY WORDS Acoustic emission; elasticity; noncontact measurement; radiation force; resonance; ultra-sound-stimulated vibro-acoustic spectrography; Young’s modulus