Application of radiation force in noncontact measurement of the elastic parameters

Ultrasound-stimulated vibro-acoustic spectrography is a recently-developed method that employs the radiation force of two intersecting continuous ultr asound beams to remotely vibrate an object at an arbitrary low frequency. O bject vibration produces a sound field (acoustic emission) in the medium, w hich is a function of object mechanical properties. By measuring the acoust ic emission field, one can obtain information about the mechanical paramete rs of the object. In this paper, we use this method for remote (noncontact) measurement of the dynamic Young's modulus of a rod based on its fundament al resonance frequency. Experimental results on an aluminum rod agree with the published data.