Acoustical-speckle interferometry

Theoretical properties of acoustical speckle interferometry

“…The one-dimensional correlation of continuous mode scanning for a rigid deformation is discussed in reference [12]. This study demonstrated that Equation (36) forms the basic concept for object motion measurement of subsurface acoustic scattering layers which agrees with the statistical relationships in laser speckle interferometry.…”

“…The direct extension of substituting an ultrasonic wave for coherent light is an obvious one, since it was first performed in the acoustical holography. An acoustical speckle interferometry study has been demonstrated to be a direct measure of object motion [11,12], which closely parallels laser speckle interferometry. The particular significance of the ultrasonics is the fact that subsurface scattering points can be recorded and correlated to measure acoustical signals.…”

“…The complex field P(X) where X = (X 1 ,X 2 ) denotes the ordered pair of numbers in the plane of the receiving transducer which is parallel to (,,n) and represents the amplitude of the reference signal, which is the field of interest from the acoustical signal. Details of both pulse echo and continuous mode scanning techniques of scattering surfaces are described in reference [11,12]. Now suppose that the receiving transducer is returned to the original position and the scattering surface is displaced from its reference configuration.…”

“…The particular significance of the p-waves is in the application of acoustical speckle interferometry to object motion measurements in layered media. Reference [12] illustrates that the p-waves are amenable to object motion measurement; therefore, this discussion will be restricted to p-wave propagation. Consider an incident p-wave in water at interface I which is a liquid-solid boundary.…”

“…In a recent work [11,12] a basic theory of one-dimensional pulse-echo and continuous wave acoustical speckle interferometry was developed. This method utilized the statistical concepts of speckle and one-dimensional correlation of ref erence and displaced signals to determine object motion of subsurface scattering layers.…”