Research on methods of choosing planar near-field acoustic holographic regularization parameters

The regularization method for adaptive determination of angular spectrum filter parameters provides a powerful tool for engineering realization of near-field acoustic holography based on spatial acoustic field transformation. The basic Tikhonov regularization parameter selection method will be under-regularized at a relatively long holographic distance, which leads to the increase of reconstruction error. By improving the original Morozov deviation principle, using simple iteration to remove some high-wavenumber components of evanescent wave, and using the first-order Tikhonov filter, the suitable regularization parameters can still be obtained at a relatively long holographic distance. The numerical simulation shows that compared with the traditional regularization parameter selection method, the proposed regularization parameters can still be obtained. The reconstruction error is reduced by about 5%~9%.