Multi-planar angular spectrum approach applied to pressure field calculations of spherically focused pistons
Keywords:Error analysis, Pistons, Pressure measurement, Sampling, Angular spectrum approach (ASA), Cartesian coordinate system, Circular pistons, Pressure fields
AbstractThe application of angular spectrum approach (ASA) on spherically focused circular pistons was analyzed. For a uniform sampling rate and field size errors produced by the ASA vary as a function of depth. The multi-planar ASA was demonstrated for a spherically focused piston with diameter 2a=16cm and radius of curvature R=16cm. The normal evaluated at the center of the spherical shell, which is coincident with z-axis, defines the origin of the Cartesian coordinate system. It was concluded that the multi-planar ASA compensates for the error by adding additional source planes and achieves much greater accuracy.
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