Frequency dependence of the acoustic radiation force function (Y p) for spherical targets for a wide range of materials

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Abstract
In a previous communication the authors reported a procedure for calculating Yp for spherical radiometer targets over wide ranges of ka, identifying the importance of fine steps in ka for accurate representations. The present paper summarizes the results of the calculation Yp, over the ka range 0–20, for over 50 different materials which are assumed to be immersed in water. A primary grouping according to material shear velocity and density is proposed. Material density has a substantial effect upon the form of the maxima and minima of the Yp curves, a low density producing higher maxima, deeper minima, and increasing the width of these features. The present calculations do not give a shear indication of the effect of the Poisson’s ratio of the material, nor explain the extremely high maxima at low wave velocities.

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