FIG. 1.

(Color online) (a) Schema of surface wave measurement on a medium. The medium surface is on the plane of x and y coordinates. The surface wave is generated by an electromechanical shaker. The surface wave is measured with a laser vibrometer. (b) Experimental setup for a rubber block phantom. The phantom sits on a vibration isolated platform and is restrained from the back. The electromechanical shaker generates a harmonic vibration excitation on the front face of the phantom. The surface normal motion of wave propagation is measured by a laser vibrometer.