Remote measurement of material properties from radiation force induced vibration of an embedded sphere

Shigao Chen; Mostafa Fatemi; James F. Greenleaf

doi:10.1121/1.1501276

Remote measurement of material properties from radiation force induced vibration of an embedded sphere

Shigao Chen, Mostafa Fatemi, James F. Greenleaf

Research output: Contribution to journal › Article › peer-review

76 Scopus citations

Abstract

A quantitative model is presented for a sphere vibrated by two ultrasound beams of frequency ω₁ and ω₂. Due to the interference of two sound beams, the radiation force has a dynamic component of frequency ω₂-ω₁. The radiation impedance and mechanical impedance of the sphere are then used to compute the vibration speed of the sphere. Vibration speed versus vibration frequency is measured by laser vibrometer on several spheres, both in water and in gel phantom. These experimental results are used to verify the model. This method can be used to estimate the material properties of the medium (e.g., shear modulus) surrounding the sphere.

Original language	English (US)
Pages (from-to)	884-889
Number of pages	6
Journal	Journal of the Acoustical Society of America
Volume	112
Issue number	3 I
DOIs	https://doi.org/10.1121/1.1501276
State	Published - Sep 2002

ASJC Scopus subject areas

Arts and Humanities (miscellaneous)
Acoustics and Ultrasonics

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10.1121/1.1501276

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AB - A quantitative model is presented for a sphere vibrated by two ultrasound beams of frequency ω1 and ω2. Due to the interference of two sound beams, the radiation force has a dynamic component of frequency ω2-ω1. The radiation impedance and mechanical impedance of the sphere are then used to compute the vibration speed of the sphere. Vibration speed versus vibration frequency is measured by laser vibrometer on several spheres, both in water and in gel phantom. These experimental results are used to verify the model. This method can be used to estimate the material properties of the medium (e.g., shear modulus) surrounding the sphere.

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Remote measurement of material properties from radiation force induced vibration of an embedded sphere

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